Unlock instant, AI-driven research and patent intelligence for your innovation.

Noise filter

A noise filter and insulator layer technology, which is applied in the direction of inductors, fixed inductors, transformer/inductor parts, etc., can solve the problems of complex stacking and combination, lower yield, and many via hole steps

Inactive Publication Date: 2009-11-11
PANASONIC CORP
View PDF6 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Noise filter
  • Noise filter
  • Noise filter

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A noise filter, comprising: a first insulator layer; swirl-shaped first and second conductors arranged on a first surface of the first insulator layer; the first and second conductors arranged on the first insulator layer The second insulator layer above the surface, the second surface is opposite to the first insulator layer, and has a via hole; it is arranged on the first surface of the second insulator layer, and the via holes are respectively electrically connected to the second insulator layer. The swirl-shaped third and fourth conductors connected to the first and second conductors; the third insulator layer arranged on the third and fourth conductors; and the first to fourth conductors connected respectively external electrodes at the ends of the conductors, the first and second conductors are arranged in parallel, the third and fourth conductors are arranged in parallel, the magnetic permeability of the second insulator layer is between that of the first and third insulator layers Below the magnetic permeability. Noise filters with high impedance values ​​in common states can be realized.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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