Patent US4769900A successfully refreshed from Google Patents.
US4769900A
Expired / Lapsed
US
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Method of making a chip coil
Assignee: Murata Manufacturing Co Ltd
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Filing: 1987-08-05
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Granted: 1988-09-13
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Expires: 2007-08-05
Abstract
Abstract A chip coil which includes a bobbin, flange portions formed at opposite end portions of the bobbin, a wire wound around a barrel portion of the bobbin, and at least two counter-part blocks of magnetic particle-containing solid resin, disposed around the wound wire. The counter-part blocks of magnetic particle-containing solid resin are adapted to be fixed to each other into one combined unit.
Inventors
- 👤 Tetsuya Morinaga
- 👤 Toshimi Kaneko
- 👤 Kazuya Nishimura
- 👤 Yukio Hata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:29
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0246; H01F27/00; H01F27/28; H01F27/29; H01F27/292; H01F27/34; H01F27/36; H01F27/366; H01F17/00; H01F17/04; H01F2017/048; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49073; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
184 words
A method of shielding a chip coil, said chip coil comprising a bobbin, flanges formed at opposite ends of said bobbin, and a wire wound around said bobbin between said flanges, the method comprising the steps of: (a) forming at least two counterpart blocks comprising magnetic particle-containing solid resin; (b) disposing said blocks about said bobbin, said blocks engaging each other so as to substantially surround said wire; and (c) fixing said blocks to each other to form a combined unit; wherein each of said counterpart blocks of magnetic particle-containing solid resin is formed by mixing magnetic particles selected from the group consisting of Mn-Zn and Ni-Zn magnetic particles into a resin selected from the group consisting of epoxy resin and silicone resin, in a mixing ratio of substantially 100 to 1900 parts of the magnetic particles to 100 parts of the resin, to form a composite material; and wherein said composite material is prepared in a semi-hardened state and then preliminarily molded into a block having a shape which permits said block to engage the flanges and the wire wound on the bobbin.
Claim 2
Independent Claim
184 words
A method of shielding a chip coil, said chip coil comprising a bobbin, flanges formed at opposite ends of said bobbin, and a wire wound around said bobbin between said flanges, the method comprising the steps of: (a) forming at least two counterpart blocks comprising magnetic particle-containing solid resin; (b) disposing said blocks about said bobbin, said blocks engaging each other so as to substantially surround said wire; and (c) fixing said blocks to each other to form a combined unit; wherein each of said counterpart blocks of magnetic particle-containing solid resin is formed by mixing magnetic particles selected from the group consisting of Mn-Zn and Ni-Zn magnetic particles into a resin selected from the group consisting of epoxy resin and silicone resin, in a mixing ratio of substantially 100 to 1900 parts of the magnetic particles to 100 parts of the resin, to form a composite material; and wherein said composite material is prepared in a semi-hardened state and then preliminarily molded into a block having a shape which permits said block to engage the flanges and the wire wound on the bobbin.
Claim 3
Dependent Claim
48 words
A method as claimed in claim 1, further comprising the step of forming a pair of electrodes on opposite edge portions of one of said flanges, said wire having two ends, and each of said ends of said wire being connected to a respective one of said electrodes.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1, wherein the magnetic particles have particle diameters in the range of 1 to 250 microns.
Claim 5
Dependent Claim
50 words
A method as claimed in claim 1, wherein each of said counter-part blocks of magnetic particle-containing solid resin has a U-shaped cross section so as to substantially completely surround said wire, when combined into a combined unit, with the extreme ends of the U-shaped blocks in engagement with each other.
Claim 6
Dependent Claim
50 words
A method as claimed in claim 1, wherein each of said counter-part blocks of magnetic particle-containing solid resin has an L-shaped cross section so as to substantially completely surround said wire, when combined into a combined unit, with the extreme ends of the L-shaped blocks in engagement with each other.
Claim 7
Dependent Claim
83 words
A method as claimed in claim 1, wherein a first one of said counter-part blocks of magnetic particle-containing solid resin has a U-shaped cross section, and a second one of said counter-part blocks has a flat plate-like shape with an I-shaped cross section configured and dimensioned so that said first and second counter-part blocks substantially completely surround the wire, when combined into a combined unit, with the extreme ends of the U-shaped block in engagement with the extreme ends of the I-shaped block.
Claim 8
Dependent Claim
36 words
A method as claimed in claim 1, wherein said blocks are configured and dimensioned so as to engage said flanges, and thereby substantially completely surround said wire, when said blocks are formed into a combined unit.
Claim 9
Dependent Claim
16 words
A method as claimed in claim 7, wherein said combined unit is adhered to said flanges.
Claim 10
Dependent Claim
16 words
A method as claimed in claim 8, wherein said combined unit is adhered to said wire.
Claim 11
Dependent Claim
37 words
A method as claimed in claim 1, wherein said blocks are then heated, brought while hot into contact with each other as well as with the wire and flanges, and then hardened to form said combined unit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |