Common mode choke coil

Details Common mode choke coil Common mode choke coil

2008-05-28

2009-11-10

Nguyen, Tuyen (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

Reexamination Certificate

active

07616085

ABSTRACT:
A common mode choke coil includes two laminated coil conductors, a first magnetic substrate arranged on one of the coil conductors, and a second magnetic substrate arranged on the other coil conductor. When it is assumed that a distance from a conductor center of the one coil conductor to the surface of the first magnetic substrate is designated as A, a distance from a conductor center of the other coil conductor to the surface of the second magnetic substrate is designated as B, and a distance from the conductor center of the one coil conductor to the conductor center of the other coil conductor is designated as C, C<(A+B)/2 is satisfied. Accordingly, because a difference in the distances between the magnetic substrates and the coil conductors becomes relatively small, a leakage inductance due to the difference in the distance decreases, and the cut-off frequency with respect to a differential mode signal can be increased.

REFERENCES:
patent: 6438000 (2002-08-01), Okamoto et al.
patent: 6618929 (2003-09-01), Kitamura
patent: 7009485 (2006-03-01), Tomohiro et al.
patent: 7453343 (2008-11-01), Ito et al.
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patent: 08-335517 (1996-12-01), None
patent: 2005012071 (2005-01-01), None
patent: 2005012072 (2005-01-01), None
patent: 2005-085997 (2005-03-01), None
patent: 2006-261585 (2006-09-01), None
patent: 2006261585 (2006-09-01), None
patent: 2007027444 (2007-02-01), None
patent: 2008198863 (2008-08-01), None
Office Action of Apr. 21, 2009 in counterpart JP Application 2007-152323 citing 8-335517; 2005-85997, and 2006-261585 (2 pages).

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