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Noise filter

A technology of noise filter and insulator layer, applied in the direction of inductors, fixed inductors, transformer/inductor components, etc., can solve the problems of decreased yield, many via steps, and complex stacking combinations.

Inactive Publication Date: 2006-08-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are many steps for via hole formation and pattern printing, and the combination of stacking is complicated.
This structure causes characteristic defects such as open circuit or short circuit in the filter of the final product, and reduces the yield in manufacturing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] figure 1 A and figure 1 B is a top view of the noise filter of Embodiment 1 of the present invention, figure 2 is a perspective view of a noise filter. The first magnetic thin plates 11a and 11b each have one first inner conductor 12 and one second inner conductor 13 on their upper surfaces. The magnetic thin plates 11a and 11b have lead electrodes 14a to 14d on the end faces, and have via electrodes 15a to 15d near the center. Magnetic thin plates 11a and 11b are made of magnetic materials such as ferrite.

[0030] The first inner conductor 12 and the second inner conductor 13 form a spiral shape with one or more turns of a conductor such as silver, and are provided so as not to be short-circuited with each other. The direction of the vortex is the same for both the first inner conductor 12 and the second inner conductor 13 in plan view.

[0031] One end of the first internal conductor 12 and the second internal conductor 13 are respectively connected to the le...

Embodiment 2

[0060] Figure 5 A~ Figure 5 C is a top view of the noise filter of Embodiment 2 of the present invention. The parts having the same structure as those in Embodiment 1 are assigned the same symbols, and descriptions thereof are omitted.

[0061] exist Figure 5 A~ Figure 5 In C, on the upper surfaces of the first magnetic thin plates 11b, 11a forming the first inner conductor 12 and the second inner conductor 13, the second inner conductor 24 having only the third inner conductor 24 connected to the first inner conductor 12 is provided. The magnetic thin plate 25 has a third magnetic thin plate 27 having only the fourth inner conductor 26 connected to the second inner conductor 13 on the lower surface. The fourth inner conductor 26 may not be provided on the third magnetic sheet 27 but may be provided directly on the dummy magnetic sheet 19 .

[0062] In this way, the third inner conductor 24 formed on the second magnetic thin plate 25 and the fourth inner conductor 26 ...

Embodiment 3

[0081] Figure 7 It is an exploded perspective view of a noise filter according to Embodiment 3 of the present invention. The filter has: a first insulator layer 121 , a spiral first conductor 127 arranged on the upper surface of the first insulator layer 121 , and a first conductor 127 arranged on the upper surface of the first insulator layer 121 Almost parallel second conductors 128 in spiral shape. The second conductor 128 and the first conductor 127 form two swirls.

[0082] This filter also has: the second insulator layer 122 that is arranged on the top of the first insulator layer 121 and sandwiches the first conductor 127 and the second conductor 128; The via holes 131a and 131b; the third conductor 129, which is a spiral conductor provided on the upper surface of the second insulator layer 122; The spiral conductor is the fourth conductor 130 . The fourth conductor 130 and the third conductor form two swirls. The third conductor 129 is connected to the first cond...

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PUM

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Abstract

The noise filter includes one first insulator layer; the first and the second spiral conductors set on the first insulator layer; the second insulator layer with through holes over the first insulator layer; the third and the fourth spiral conductors set on the second insulator layer connected separately through the through holes to the first and the second conductors; the third insulator layer set on the third and the fourth conductors; and the one external electrode connected to the ends of the four conductors. The first and the second spiral conductors are configured in parallel, and the third and the fourth spiral conductors are configured in parallel. The second insulator layer has magnetic permeability lower than that of the first and the third insulator layer. The present invention is one costate high impedance noise filter.

Description

[0001] This application is a divisional application of application number 02803416.3 (application date: January 11, 2002; title of invention: noise filter and electronic equipment using the noise filter). technical field [0002] The present invention relates to a noise filter used in parts for solving noise problems of mobile phones, information appliances, etc., and electronic equipment using the noise filter. Background technique [0003] Figure 13 A~ Figure 13 G is a plan view of a conventional multilayer transformer of a noise filter disclosed in JP-A-62-257709. This transformer has a plurality of magnetic thin plates 1 , first coil patterns 2 and second coil patterns 3 , one each of which is provided on the upper surface of each magnetic thin plate 1 . When viewed from above, the first and second coil patterns provided on the magnetic thin plate 1 form a helical shape with about 0.25 to 0.75 turns in the same direction and are substantially parallel to each other. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F17/00H01F37/00H01F1/01H01F27/00
Inventor 千叶博伸大石一夫瓜生英一织田武司中山祥吾松村和俊元满弘法新海淳鹫崎智幸
Owner PANASONIC CORP