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Multi-layer impedance

A technology of impedance components and magnetic layers, applied in electrical components, components of transformers/inductors, inductors, etc., can solve problems such as different magnetic permeability and changes in electrical characteristics

Inactive Publication Date: 2002-10-02
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is a problem with this type of multilayer impedance element in the case that when the impedance element is fixed to a printed circuit board, its electrical characteristics will be affected by two layers of the multilayer structure disposed on the fixing surface. Changes depending on the position of the upper and lower coils, where the two coils have different permeability

Method used

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Examples

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no. 1 example

[0019] Embodiments of the multilayer impedance element according to the present invention will be described in detail below with reference to the accompanying drawings. The first embodiment ( Figure 1-Figure 5 )

[0020] refer to figure 1 , the multilayer impedance element 1 includes high-permeability magnetic sheets 2 to 6 on which coil wire patterns 16-19 and 24-27 are formed; low-permeability magnetic sheets 8 to 12 which have coils formed thereon Lead pattern 20-23, and middle sheet 7 etc. Magnetic pieces 2-6 are made of insulating paste containing high permeability ferrite powder such as Ni-Cu-Zn ferrite or Mn-Zn ferrite. Similarly, magnetic sheets 8-12 are formed from insulating paste containing low permeability ferrite powder. In the first embodiment of the present invention, the relative permeability μ of the high-permeability magnetic sheet 2-6 is set at 300 or higher, and the relative permeability μ of the low-permeability magnetic sheet 2-6 Set at 100 or lower...

no. 2 example

[0033] Such as Figure 6 As shown in , the multilayer impedance element 51 of the second embodiment of the present invention is formed by superimposing the upper high permeability coils 71 and 72 and the lower low permeability coil 73 . Between the high-permeability coils 71 and 72 and the low-permeability coil 73, intermediate layers 74 and 75 made of, for example, glass or glass ceramics are provided.

[0034] The high-permeability coil 71 is formed by laminating high-permeability magnetic sheets on which the coil wire patterns 52 to 55 are formed. The coil wire patterns 52 to 55 are connected in series through through holes (not shown) formed in the magnetic sheet, thereby forming the first winding portion L1 of the high magnetic permeability coil 71 .

[0035] The high-permeability coil 72 is formed by laminating high-permeability magnetic sheets on which the coil wire patterns 60 to 63 are formed. The coil wire patterns 60 to 63 are connected in series through through h...

no. 3 example

[0039] Third embodiment: Figure 7

[0040] Such as Figure 7 As shown in , the multilayer impedance element 81 of the third embodiment of the present invention is formed by providing high magnetic permeability 101 and 102 on each side of a low magnetic permeability coil 103 . Between the high-permeability coils 101 and 102 and the low-permeability coil 103, intermediate layers 104 and 105 made of, for example, glass or glass ceramics are provided.

[0041] The high-permeability coil 101 is formed by stacking high-permeability magnetic sheets on which coil wire patterns 82 to 85 are formed. The coil wire patterns 82 to 85 are connected in series through through holes (not shown) formed in the magnetic sheet, thereby forming the first winding portion L1 of the high magnetic permeability coil 101 .

[0042] The high-permeability coil 102 is formed by stacking high-permeability magnetic sheets on which the coil wire patterns 90 to 93 are formed. The coil wire patterns 90 to 9...

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Abstract

The invention provides a multilayer impedance element, which has no directionality when fixed and can obtain excellent electrical characteristics. The multilayer impedance element comprises a high-permeability coil part, including at least a first winding part and a third winding part, wherein the first winding part and the third winding part are made of a plurality of relatively high-permeability materials The magnetic layer is formed by superimposing a plurality of coil wire patterns; a low magnetic permeability coil part, the low magnetic permeability coil part at least includes a second winding part, which is made of a relatively low magnetic permeability material The manufactured multiple magnetic layers are superimposed with multiple coil wire patterns; the three winding parts are sequentially connected in series to form a helical coil. The ends of the helical coil lead from the coil wire pattern formed in the high permeability coil to the respective input and output external electrodes.

Description

technical field [0001] The present invention relates to a multilayer impedance element, more particularly to a multilayer impedance element installed in various circuits as a noise filter. Background technique [0002] Known multilayer impedance elements of this type are disclosed in Japanese Unexamined Patent Publication No. 9-7835 and Japanese Unexamined Utility Model No. 6-82822. Each type of multilayer impedance element has a multilayer structure formed by stacking multilayer coils, wherein the multilayer coils have different magnetic permeability. In addition, the coil wire patterns of the coil are connected in series with each other to form a helical coil. In the multilayer impedance element, high impedance is maintained over a wide frequency range from low frequency to high frequency, thereby widening the frequency band for eliminating noise. [0003] However, there is a problem with this type of multilayer impedance element in the case that when the impedance eleme...

Claims

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Application Information

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IPC IPC(8): H01F17/00H01F27/245H01F27/28
CPCH01F17/0013H01F27/2804H01F27/245
Inventor 高嶋浩一德田博道
Owner MURATA MFG CO LTD
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