MULTILAYER COMMON MODE FILTER
First Claim
1. A multilayer common mode filter comprising a matrix formed by laminating a plurality of nonmagnetic layers including a pair of nonmagnetic layers having respective surfaces formed with spiral coil conductors and a pair of magnetic layers holding the plurality of nonmagnetic layers therebetween;
- wherein the plurality of nonmagnetic layers have respective surfaces provided with magnetic layers located in an inner region of the coil conductors; and
wherein the plurality of nonmagnetic layers are laminated such that a columnar part where magnetic and nonmagnetic bodies are arranged alternately in the laminating direction is formed in the inner region between the pair of magnetic layers.
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Accused Products
Abstract
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.
20 Citations
6 Claims
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1. A multilayer common mode filter comprising a matrix formed by laminating a plurality of nonmagnetic layers including a pair of nonmagnetic layers having respective surfaces formed with spiral coil conductors and a pair of magnetic layers holding the plurality of nonmagnetic layers therebetween;
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wherein the plurality of nonmagnetic layers have respective surfaces provided with magnetic layers located in an inner region of the coil conductors; and wherein the plurality of nonmagnetic layers are laminated such that a columnar part where magnetic and nonmagnetic bodies are arranged alternately in the laminating direction is formed in the inner region between the pair of magnetic layers. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification