US4007477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly of a recessed heat sink and a semiconductor device sealed within the recess in the heat sink and thermally connected to the heat sink
Assignee: Lucas Electrical Co Ltd
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Filing: 1974-12-30
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Granted: 1977-02-08
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Expires: 1994-12-30
Abstract
Abstract A semi-conductor assembly includes a conductive stud and a semi-conductor device mounted on the stud so that a first contact area of the device is thermally and electrically connected thereto. Thermally and electrically connected to a second contact area of the device is an expanded head portion of an electrical lead. A body is shaped to define a recess in which the stud is engaged so that the device is accommodated in the space defined between the stud and the walls of the recess, the electrical lead extending through an aperture in one of said walls. Sealing means prevents ingress of foreign material through the aperture into said space, and a resilient member is trapped and deformed between the head portion of the lead and the body so that the head portion of the lead is urged into pressure contact with the device.
Inventors
- 👤 Dennis George Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:03
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/70; H10W40/77; H10W40/778; H10W72/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A semi-conductor assembly including a conductive stud, a semi-conductor device, a first contact area of said device being thermally and electrically connected to said stud, and electrical lead including an expanded head portion, said head portion being thermally and electrically connected to a second contact area of said device, a single body of thermally conductive material forming a heat sink and provided with a cup-shaped recess portion having a bottom wall portion and an aperture through said bottom wall portion, said recessed portion receiving said conductive stud in thermal engagement therewith to close the open end of said recess, said electrical lead passing through said aperture in said recess, sealing sleeve means of insulating material passing through said aperture and disposed between said electrical lead and said aperture to prevent ingress of foreign material into said recess through said aperture, and deformable resilient means disposed within said recess between the expanded head portion of said electrical lead and the inner wall of said recess to urge the head portion of said lead into pressure contact with the second contact area of said semi-conductor device.
Claim 2
Dependent Claim
184 words
A semi-conductor assembly including a conductive stud, a semi-conductor device, a first contact area of said device being thermally and electrically connected to said stud, and electrical lead including an expanded head portion, said head portion being thermally and electrically connected to a second contact area of said device, a single body of thermally conductive material forming a heat sink and provided with a cup-shaped recess portion having a bottom wall portion and an aperture through said bottom wall portion, said recessed portion receiving said conductive stud in thermal engagement therewith to close the open end of said recess, said electrical lead passing through said aperture in said recess, sealing sleeve means of insulating material passing through said aperture and disposed between said electrical lead and said aperture to prevent ingress of foreign material into said recess through said aperture, and deformable resilient means disposed within said recess between the expanded head portion of said electrical lead and the inner wall of said recess to urge the head portion of said lead into pressure contact with the second contact area of said semi-conductor device.
Claim 3
Dependent Claim
36 words
A semi-conductor assembly as claimed in claim 1 wherein said sleeve means is provided with an annular flange at the inner end therefor for engagement with the inner surface of said recess annularly about said aperture.
Claim 4
Dependent Claim
38 words
A semi-conductor assembly as claimed in claim 1 wherein said conductive stud is knurled about its periphery for pressing engagement into said recess whereby the material of said conductive body is displaced when said stud is pressed thereinto.
References Cited (Backward Citations)
US3176382A
Cited
FR1459516A
Cited
US3474302A
Cited
US3513360A
Cited
US3449506A
Cited
US3743896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |