Magnetic sheet and coil module including the same

JP2025167937APending Publication Date: 2025-11-07TDK CORP
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Patent Information

Application Number
JP2024072963
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-04-26
Publication Date
2025-11-07

AI Technical Summary

Technical Problem

The magnetic sheet disclosed in Patent Document 1 has a high temperature dependency of the real part of magnetic permeability, which affects its performance.

Method used

A magnetic sheet with alternating regions having opposite temperature dependencies of the real part of magnetic permeability, where one region has a negative temperature dependence and the other has a positive temperature dependence, is designed to cancel out temperature-related changes, using specific alloy materials and thickness ratios to maintain consistent magnetic permeability.

Benefits of technology

The magnetic sheet effectively suppresses the temperature dependency of the real part of magnetic permeability, enhancing coil inductance and reducing magnetic flux leakage, while maintaining performance across varying temperatures.

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Abstract

To provide a magnetic sheet in which the temperature dependency of the real part μ' of magnetic permeability is suppressed.SOLUTION: A magnetic sheet 20 has a first region 21 and a second region 22 arranged in the thickness direction. In a predetermined temperature range higher than room temperature, the first region 21 has a negative temperature dependency of the real part μ' of magnetic permeability, and the second region 22 has a positive temperature dependency of the real part μ' of magnetic permeability. This makes it possible to provide a magnetic sheet in which the temperature dependency of the real part μ' of the combined magnetic permeability is suppressed.SELECTED DRAWING: Figure 4
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Citation Information

Patent Citations

  • Composite magnetic material

    JP2011082278A