Tdk Corporation

Takuo Hattori

Makoto Yoshino

Shinichi Sato

Takahiro Sato

Takeshi Shibayama

Hidenobu Umeda

Yuma Ishikawa

Ryota Nakanishi

A second coil opposes a first coil in a first direction. The first and second coils are positioned between a first conductor and a second conductor in the first direction. The first conductor is adjacent to the first coil in the first direction and overlaps a part of the first coil when viewed from the first direction. The second conductor is adjacent to the second coil in the first direction and overlaps a part of the second coil when viewed from the first direction. The first and second conductors are of a shape extending in a line. Inner regions of the first and second coils include regions not overlapping the first and second conductors when viewed from the first direction.

Multilayer common mode filter

An electrostatic protection component includes: a body in which a plurality of ceramic substrates is laminated; and a pair of discharge electrodes which are formed within the body and which are spaced to face each other. The discharge electrodes include main body portions extending along a longitudinal direction, and the main body portions include tips in the longitudinal direction and side edges extending along the longitudinal direction. The pair of discharge electrodes are arranged such that both the main body portions are adjacent to each other in a short direction. The discharge electrodes face each other in the short direction between the side edges, and discharge occurs only between the side edges, between the discharge electrodes.

Electrostatic protection component

A first coil is configured in such a structure that first and second coil conductors are connected by a first through-hole conductor. A second coil is configured in such a structure that third and fourth coil conductors are connected by a second through-hole conductor. The first and second coils are arranged in a nonmagnetic section consisting of nonmagnetic layers. A portion located inside the first coil and the second coil in the nonmagnetic section includes a first regional portion and a second regional portion adjacent to each other when viewed from a laminated direction of the nonmagnetic layers. The first and second through-hole conductors are located in the first regional portion so as to be adjacent to each other, when viewed from the laminated direction. A magnetic core section comprised of a magnetic material is located in the second regional portion when viewed from the laminated direction.

A multilayer common mode filter is provided, which can inhibit cracks from occurring, while securing the magnetic coupling between coil conductors. Since magnetic layers are disposed in an inner region of spiral first and second coil conductors, the multilayer common mode filter can secure the magnetic coupling between the first and second coil conductors. In a columnar part including these magnetic layers, magnetic and nonmagnetic bodies are arranged alternately in the laminating direction, whereby the total volume of the magnetic layers in the inner region can be kept smaller than in the case where a magnetic layer penetrates through the inner region of the coil conductors. As a result, at the time of firing a matrix, the difference in the amount of shrinkage between the nonmagnetic and magnetic layers can be suppressed, so as to inhibit cracks from occurring at their interfaces.

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Tokyo, Japan

Takuo Hattori