US5345670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a surface-mount power magnetic device
Assignee: Nokia Bell Labs
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Filing: 1992-12-11
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Granted: 1994-09-13
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Expires: 2012-12-11
Abstract
Abstract A magnetic device (10), suitable for attachment to a substrate, includes at least one sheet winding (24) having a pair of spaced-apart terminations (26), each receiving an upwardly rising portion (28) of a lead (12). The sheet winding terminations and upwardly-rising lead portions, together with at least a portion of the sheet windings, are then encapsulated with masses of insulative material (18, 19 and 34). A ferromagnetic core (20,22) surrounds at least a portion of the sheet windings to impart a desired magnetic property to the device.
Inventors
- 👤 Lennart D. Pitzele
- 👤 Matthew A. Wilkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:09
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F17/00; H01F17/0006; H01F17/04; H01F27/00; H01F27/02; H01F27/027; H01F5/00; H01F5/04; H01F2005/046; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49073; Y10T29/49117; Y10T29/49121; Y10T29/49169; Y10T29/49171; Y10T29/49172
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A method of manufacturing a magnetic device for attachment to a substrate, comprising the steps of: placing at least one generally planar sheet winding, having a pair of spaced-apart terminations, onto a lead frame stock such that each termination receives an upwardly rising portion of a separate lead integral with the lead frame stock so as to make an electrical connection with the winding termination; encapsulating each sheet winding termination and the upwardly rising portion of each lead with a mass of insulative material; attaching a ferromagnetic core about a portion of each sheet winding completely separating each lead from the lead frame stock; and forming each lead for attachment to a substrate.
Claim 2
Independent Claim
113 words
A method of manufacturing a magnetic device for attachment to a substrate, comprising the steps of: placing at least one generally planar sheet winding, having a pair of spaced-apart terminations, onto a lead frame stock such that each termination receives an upwardly rising portion of a separate lead integral with the lead frame stock so as to make an electrical connection with the winding termination; encapsulating each sheet winding termination and the upwardly rising portion of each lead with a mass of insulative material; attaching a ferromagnetic core about a portion of each sheet winding completely separating each lead from the lead frame stock; and forming each lead for attachment to a substrate.
Claim 3
Dependent Claim
37 words
The method according to claim 1 wherein a plurality of sheet windings are placed one above the other such that each sheet winding termination receives the upwardly rising portion of a separate lead of the lead frame.
Claim 4
Dependent Claim
51 words
The method according to claim 2 wherein the leads of the lead frame are arranged in two spaced-apart banks and wherein the step of encapsulating each sheet winding termination and upwardly rising portion of each lead includes the step of molding a mass of insulative material about each bank of leads.
Claim 5
Dependent Claim
32 words
The method according to claim 1 wherein the step of attaching a core comprises gluing each of a pair of core halves on opposite sides of a portion of each sheet winding.
Claim 6
Dependent Claim
25 words
The method according to claim 1 further including the step of solder-bonding each sheet winding termination to the upwardly rising portion of a separate lead.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |