EP0428907A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
LC Noise filter
Assignee: Individual
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Filing: 1990-10-26
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Granted: —
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Expires: 2010-10-26
Abstract
Abstract The present invention provides an LC noise filter consisting of a capacitance and an inductance, including a first insulation sheet (20) having a plurality of portions (22-1 ... 22-8) folded alternately in the opposite directions and stacked one above another; a first conductor (40) applied to the insulation sheet at one side (20a) and adapted to form a coil having a given number of turns when the folded portions of the insulation sheet are folded alternately in the opposite directions and stacked one above another; and a second conductor applied to the insulation sheet at the other side (20b) and located substantially opposite to the first conductor to form a capacitance therebetween, whereby the filter can eliminate incoming noises without creation of any undesirable phenomenon such as ringing or the like.
Inventors
- 👤 Takeshi Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 20:32
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/2847; H01G; H01G4/00; H01G4/40; H10; H10D; H10D86/00; H10D86/80; H10D86/85; H01F17/00; H01F17/0006; H01F17/0013; H01F2027/2857; H03; H03H; H03H1/00; H03H2001/0021; H03H2001/0071; H03H2001/0085; H03H2001/0092; H03H7/00; H03H7/42; H03H7/425; H03H7/427
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
An LC noise filter comprising: a first insulation sheet having a plurality of portions folded alternately in the opposite directions and stacked one above another; a first conductor provided on said first insulation sheet at one side to form a coil having a given number of turns when said folded portions are folded alternately in the opposite directions and stacked one above another; and a second conductor provided on said first insulation sheet at the other side, said second conductor being located substantially opposed to said first conductor to form a capacitance therebetween.
Claim 2
Dependent Claim
93 words
An LC noise filter comprising: a first insulation sheet having a plurality of portions folded alternately in the opposite directions and stacked one above another; a first conductor provided on said first insulation sheet at one side to form a coil having a given number of turns when said folded portions are folded alternately in the opposite directions and stacked one above another; and a second conductor provided on said first insulation sheet at the other side, said second conductor being located substantially opposed to said first conductor to form a capacitance therebetween.
Claim 3
Dependent Claim
57 words
An LC noise filter as defined in claim 1, further comprising a second insulation sheet superposed on said first insulation sheet with said second conductor located between the first and second insulation sheets, said second insulation sheet having a plurality of portions folded and stacked similarly at the same time when the first insulation sheet is folded.
Claim 4
Dependent Claim
52 words
An LC noise filter as defined in claim 1 or 2 wherein said first conductor is formed as an inductive conductor having input/output terminals and said second conductor is formed as a capacitive conductor having a grounding terminal, whereby said LC noise filter can be formed as a normal mode type filter.
Claim 5
Dependent Claim
30 words
An LC noise filter as defined in claim 3 wherein said second conductor is divided into a plurality of sections, each of said sections being connected with said grounding terminal.
Claim 6
Dependent Claim
40 words
An LC noise filter as defined in claim 1 or 2 wherein said first and second conductors are formed as inductive conductors each having input/output terminals, whereby said LC noise filter can be formed as a common mode type filter.
Claim 7
Dependent Claim
82 words
An LC noise filter as defined in claim 1 or 2, further comprising a third conductor provided on said second insulation sheet at one side and disposed substantially opposite to said second conductor through said second insulation sheet and wherein said second conductor is formed as a capacitive conductor having a grounding terminal and said first and third conductors are formed as inductive conductors each having input/output terminals, whereby said LC noise filter can be formed as a common mode type filter.
Claim 8
Dependent Claim
59 words
An LC noise filter as defined in claim 6, further comprising a third insulation sheet superposed on said second insulation sheet with said third conductor located between the second and third insulation sheets, said third insulation sheet having a plurality of portions folded and stacked similarly at the same time when the first and second insulation sheet are folded.
Claim 9
Dependent Claim
39 words
An LC noise filter as defined in any one of claims 1 through 7 wherein each of said input/output terminals includes an external connection conductor which extends outwardly from said stack when said insulation sheets are folded and stacked.
Claim 10
Dependent Claim
35 words
An LC noise filter as defined in any one of claims 1 through 8 wherein each of said insulation sheets is a continuous sheet including said folded portions which are connected together through folding lines.
Claim 11
Dependent Claim
15 words
An LC noise filter as defined in claim 9 wherein said folding lines are perforated.
Claim 12
Dependent Claim
23 words
An LC noise filter as defined in claim 10 wherein each of said conductors partially extends along one of said perforated folding lines.
Claim 13
Dependent Claim
55 words
An LC noise filter as defined in any one of claims 1 through 8 wherein each of said insulation sheets is formed by a plurality of separated folded portions, each two adjacent folded portions being connected with each other through one or both of the conductors applied to that insulation sheet at the opposite sides.
Claim 14
Dependent Claim
87 words
An LC noise filter as defined in any one of claims 1 through 12 wherein said first conductor comprises a plurality of inductive conductor sections each in the form of a partially opened ring, said conductor sections being located on said insulation sheet at one side in the respective folded portions and disposed to direct the openings of said rings alternately in the opposite directions and wherein said conductor sections form a coil having a given number of turns when said insulation sheet is folded and stacked.
Claim 15
Dependent Claim
26 words
An LC noise filter as defined in any one of claims 1 through 13 wherein said stack is coated with any suitable plastic material by molding.
Claim 16
Dependent Claim
22 words
An LC noise filter as defined in claim 8 wherein said external connection conductors are aligned with one another substantially in line.
Claim 17
Dependent Claim
38 words
An LC noise filter as defined in any one of claims 1 through 15 wherein said stack includes a bore formed therethrough to receive a magnetic core, said bore receiving a magnetic material for forming a magnetic path.
Claim 18
Dependent Claim
33 words
An LC noise filter as defined in any one of claims 1 through 16 wherein each of said conductors is formed to have a conductive pattern gradually decreased in size toward one end.
References Cited (Backward Citations)
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