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Noise filter and electronic apparatus comprising this noise filter

A noise filter and external electrode technology, applied in circuits, inductors, electrical components, etc., can solve the problems of complex stacking and combination, lower yield, and more via holes.

Inactive Publication Date: 2004-09-08
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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  • Noise filter and electronic apparatus comprising this noise filter
  • Noise filter and electronic apparatus comprising this noise filter
  • Noise filter and electronic apparatus comprising this noise filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1A and 1B are plan views of a noise filter according to Embodiment 1 of the present invention, and FIG. 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.

[0029] 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.

[0030] One end of the first internal conductor 12 and the second internal conductor 13 are respectively connected to the lead-out elec...

Embodiment 2

[0059] 5A to 5C are top views of a noise filter according to 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.

[0060] In FIGS. 5A to 5C , on the upper surfaces of the first magnetic thin plates 11b, 11a on which the first inner conductor 12 and the second inner conductor 13 are formed, a third inner conductor having only a connection with the first inner conductor 12 is provided. The second magnetic thin plate 25 of the conductor 24 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 .

[0061] In this way, the third inner conductor 24 formed on the second magnetic thin plate 25 and the fourth inner conductor 26 formed on the thir...

Embodiment 3

[0080] Fig. 7 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.

[0081] 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; Via holes 131a and 131b; a spiral conductor provided on the upper surface of the second insulator layer 122, that is, the third conductor 129; provided almost in parallel with the third conductor 129 provided on the upper surface of the second second insulator layer The spiral conductor is the fourth conductor 130 . The four...

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PUM

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Abstract

A noise filter having an impedance value of high common mode allows each of first and second internal conductors (12, 13) provided in a first magnetic sheet (11a, 11b) to take a spiral form of one or more turns, where the second internal conductor (13) is so provided inside the first internal conductor (12) so that they may not be short-circuited. One end of the first internal conductor (12) is set close to one end of the second internal conductor (13). The other ends of the first and second internal conductors (12, 13) are connected, respectively, to the other ends of the first and second internal conductors (12, 13) provided in the other magnetic sheet.

Description

technical field [0001] 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 [0002] 13A to 13G are plan views 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. [0003] And, a plurality of magnetic thin plates 1 are stacked, as shown in FIGS. 13B to 13F, a plurality of first coil patterns 2 arranged on each magnetic thin plate 1 are connected to each other to form a first coil 4, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F17/00H03H1/00
CPCH01F2017/0093H01F17/0013H01F2017/065H01F17/00
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