Patent EP0388985A2 successfully refreshed from Google Patents.
EP0388985A2
Expired / Lapsed
EP
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LC noise filter
Assignee: Individual
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Filing: 1990-03-23
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Granted: —
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Expires: 2010-03-23
Abstract
Abstract An LC noise filter comprising a dielectric substrate (10), a plurality of concentrically adjacent spiral grooves provided in at least one surface (10a) of the substrate, and a plurality of inductor conductors (20-1, 20-2) provided in the respective spiral grooves. The inductor conductors are opposed to each other with the wall body between the grooves therebetween so as not to obstruct the magnetic path of the magnetic flux of the opposite inductor conductor. That is, a distribution constant LC noise filter having a sufficient capacitance and excellent electric characteristics without lowering the inductance of each inductor conductor is disclosed.
Inventors
- 👤 Takeshi Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 19:05
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/42; H03H7/425; H03H7/427; H01; H01F; H01F38/00; H01F38/48; H01F17/00; H01F17/0006; H03H1/00; H03H2001/0021; H03H2001/0078; H03H2001/0092
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
72 words
An LC noise filter characterized in that a plurality of spiral grooves are provided in at least one surface of a dielectric in such a manner as to be concentrically adjacent to each other; a plurality of inductor conductors each of which is provided in each of said grooves; and each of said inductor conductors forms a capacitor with the inductor conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 2
Dependent Claim
72 words
An LC noise filter characterized in that a plurality of spiral grooves are provided in at least one surface of a dielectric in such a manner as to be concentrically adjacent to each other; a plurality of inductor conductors each of which is provided in each of said grooves; and each of said inductor conductors forms a capacitor with the inductor conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 3
Dependent Claim
55 words
An LC noise filter according to Claim 1, wherein the number of said spiral grooves is at least two, and one of said spiral groove is provided with a energizing inductor conductor and the other groove is provided with a grounding inductor conductor, whereby said LC noise filter constitutes a normal mode LC noise filter.
Claim 4
Dependent Claim
56 words
An LC noise filter according to Claim 1, wherein the number of said spiral grooves is at least four, and energizing inductor conductors are provided in two grooves which are not adjacent to each other, and shield conductors are provided in the other grooves, whereby said LC noise filter constitutes a common mode LC noise filter.
Claim 5
Dependent Claim
60 words
An LC noise filter according to any of Claims 1 to 3, wherein said dielectric is used as a substrate; said plurality of spiral grooves are provided in at least one surface of said substrate in such a manner as to be concentrically adjacent to each other; and each of said inductor conductor is provided in each of said grooves.
Claim 6
Dependent Claim
41 words
An LC noise filter according to any of Claims 1 to 4, wherein a through hole is provided at the center of said substrate and a magnetic path is formed on the surface of said substrate by using a magnetic material.
Claim 7
Dependent Claim
65 words
An LC noise filter according to any of Claims 1 to 5, wherein said dielectric is formed into a thick substrate; said plurality of spiral grooves are formed in said substrate as deep grooves; and each of said inductor conductors is provided in each of said deep spiral grooves in such a manner as to be opposed to each other with said wall body therebetween.
Claim 8
Dependent Claim
33 words
An LC noise filter according to Claim 6, wherein each of said spiral grooves is formed into a deep groove which penetrates through said substrate from one surface to the back surface thereof.
Claim 9
Dependent Claim
98 words
A multi-channel noise filter characterized in that a plurality of LC noise filters are arranged adjacently to each other on a substrate made of a dielectric; each of said LC noise filters includes a plurality of spiral grooves provided in at least one surface of said substrate in such a manner as to be concentrically adjacent to each other, and a plurality of inductor conductors each of which is provided in each of said grooves; and each of said inductor conductors forms a capacitor with the inductor conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 10
Dependent Claim
98 words
A multi-channel noise filter characterized in that a plurality of LC noise filters are arranged adjacently to each other on a substrate made of a dielectric; each of said LC noise filters includes a plurality of spiral grooves provided in at least one surface of said substrate in such a manner as to be concentrically adjacent to each other, and a plurality of inductor conductors each of which is provided in each of said grooves; and each of said inductor conductors forms a capacitor with the inductor conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 11
Dependent Claim
91 words
An LC noise filter characterized in that a spiral groove is provided in at least one surface of a dielectric; at least one ground groove is provided in at least one surface of said dielectric in such a manner as to be adjacent to a part of said spiral groove; an inductor conductor pis rovided in said spiral groove; a grounding block conductor is provided in said ground groove; and said inductor conductor forms a capacitor with the grounding block conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 12
Dependent Claim
91 words
An LC noise filter characterized in that a spiral groove is provided in at least one surface of a dielectric; at least one ground groove is provided in at least one surface of said dielectric in such a manner as to be adjacent to a part of said spiral groove; an inductor conductor pis rovided in said spiral groove; a grounding block conductor is provided in said ground groove; and said inductor conductor forms a capacitor with the grounding block conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 13
Dependent Claim
43 words
An LC noise filter according to Claim 9, wherein said inductor conductor provided in said spiral groove is used as an energizing inductor conductor and constitutes a normal mode LC noise filter together with said grounding block conductor provided in said ground groove.
Claim 14
Dependent Claim
65 words
An LC noise filter according to Claim 9, wherein at least two spiral grooves are provided in such a manner as to be concentrically adjacent to each other as said spiral groove, and energizing inductor conductors each of which is provided in each of said spiral grooves together with said grounding block conductor provided in said ground groove constitute a common mode LC noise filter.
Claim 15
Dependent Claim
43 words
An LC noise filter according to any of Claims 9 to 11, wherein a plurality of said grounding block conductors are provided, and one of said grounding block conductors is disposed in proximity to the input or output terminal of said inductor conductor.
Claim 16
Dependent Claim
49 words
An LC noise filter according to any of Claims 9 to 11, wherein said grounding block conductor includes a first block conductor disposed in proximity to the input terminal of said inductor conductor and a second block conductor disposed in proximity to the output terminal of said inductor conductor.
Claim 17
Dependent Claim
48 words
An LC noise filter according to Claim 13, wherein said grounding block conductor includes a plurality of third block conductors disposed in such a manner as to be adjacent to a part of said inductor conductor between the input terminal and the output terminal of said inductor conductor.
Claim 18
Dependent Claim
47 words
An LC noise filter according to any of Claim 9 to 14, wherein a plurality of grounding block conductors are intermittently provided between the lines of said inductor conductor so as to function as a shield conductor for preventing short circuit between lines of said inductor conductor.
Claim 19
Dependent Claim
64 words
An LC noise filter according to any of Claims 9 to 15, wherein said dielectric is used as a substrate; said spiral groove and said ground groove are provided in at least one surface of said substrate in such a manner as to be concentrically adjacent to each other; and said inductor conductor and grounding block conductor are provided in each of said grooves.
Claim 20
Dependent Claim
34 words
An LC noise filter according to any of Claims 9 to 16, wherein said dielectric is formed into a thick substrate; and said spiral groove is formed in said substrate as a deep groove.
Claim 21
Dependent Claim
31 words
An LC noise filter according to Claim 17, wherein said spiral groove is formed into a deep groove which penetrates through said substrate from one surface to the back surface thereof.
Claim 22
Dependent Claim
48 words
An LC noise filter according to any of Claims 9 to 18, wherein a through hole which is situated at the center of said spiral groove is provided in said substrate and a magnetic path is formed on the surface of said substrate by using a magnetic material.
Claim 23
Dependent Claim
113 words
A multi-channel noise filter characterized in that a plurality of LC noise filters arranged adjacently to each other on a substrate made of a dielectric; each of said LC noise filters includes a spiral groove provided in at least one surface of said substrate, at least one ground groove provided in at least one surface of said dielectric in such a manner as to be adjacent to a part of said spiral groove, an inductor conductor provided in said spiral groove, and a grounding block conductor provided in said ground groove; and said inductor conductor forms a capacitor with the grounding block conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 24
Dependent Claim
113 words
A multi-channel noise filter characterized in that a plurality of LC noise filters arranged adjacently to each other on a substrate made of a dielectric; each of said LC noise filters includes a spiral groove provided in at least one surface of said substrate, at least one ground groove provided in at least one surface of said dielectric in such a manner as to be adjacent to a part of said spiral groove, an inductor conductor provided in said spiral groove, and a grounding block conductor provided in said ground groove; and said inductor conductor forms a capacitor with the grounding block conductor adjacent thereto with the wall body of said dielectric therebetween.
Claim 25
Dependent Claim
66 words
An LC noise filter characterized in that a spiral inductor conductor is provided on at least one surface of an insulating substrate; at least one grounding block conductor is provided at least one surface of said substrate in such a manner as to be adjacent to a part of said inductor conductor; and said inductor conductor forms a capacitor with the grounding block conductor adjacent thereto.
Claim 26
Dependent Claim
66 words
An LC noise filter characterized in that a spiral inductor conductor is provided on at least one surface of an insulating substrate; at least one grounding block conductor is provided at least one surface of said substrate in such a manner as to be adjacent to a part of said inductor conductor; and said inductor conductor forms a capacitor with the grounding block conductor adjacent thereto.
References Cited (Backward Citations)
No citation records indexed.
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