US4953173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device
Assignee: Toshiba Corp
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Filing: 1988-08-04
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Granted: 1990-08-28
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Expires: 2008-08-04
Abstract
Abstract A semiconductor device comprises an inverted-tray-shaped support frame having a concave inner surface, a semiconductor element supported by the support frame at the center of its inner surface, and a plurality of leads which are formed on the inner surface of the support frame over an insulative layer interposed therebetween, and which extend from the center of the support frame outward to the periphery hereof and are electrically connected at their inner root ends to respective electrodes of the semiconductor element. The support frame reinforces and preserves the mechanical strength of the leads, which can therefore be spaced more closely and accurately.
Inventors
- 👤 Takao Fujitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:21
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/36; H05K3/361; H05K3/363; H10; H10W; H10W70/00; H10W70/40; H10W70/451; H10W70/60; H10W70/62; H10W70/65; H10W70/67; H10W70/68; H10W70/685; H10W70/6875; H10W72/00; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/056; H05K1/14; H05K1/141; H05K2201/00; H05K2201/09; H05K2201/09009; H05K2201/091; H05K2201/10; H05K2201/10227; H05K2201/10424; H05K2201/10613; H05K2201/10621; H05K2201/10681; H05K2201/10742; H05K2201/1075; H05K2201/10757; H05K2201/10772; H05K2203/00; H05K2203/30; H05K2203/302; H05K3/0058; H05K3/0061; H10W72/50; H10W72/551; H10W72/552; H10W72/851; H10W72/874; H10W72/884; H10W74/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A semiconductor device comprising a support frame formed from a thin aluminum sheet of rectangular shape and having over one surface thereof a lining of an electrically insulative layer, a plurality of leads formed by pattern etching on the surface of said insulative layer, the leads being electrically insulated from each other and extending from substantially the central part of said frame support to the outer peripheral part thereof, outer peripheral edges of the aluminum sheet coinciding with the outer ends of the leads, and a semiconductor element having a plurality of electrodes and mounted on the central part of said support frame on the insulative side thereof, said electrodes being electrically connected to the inner ends of the corresponding leads.
Claim 2
Dependent Claim
121 words
A semiconductor device comprising a support frame formed from a thin aluminum sheet of rectangular shape and having over one surface thereof a lining of an electrically insulative layer, a plurality of leads formed by pattern etching on the surface of said insulative layer, the leads being electrically insulated from each other and extending from substantially the central part of said frame support to the outer peripheral part thereof, outer peripheral edges of the aluminum sheet coinciding with the outer ends of the leads, and a semiconductor element having a plurality of electrodes and mounted on the central part of said support frame on the insulative side thereof, said electrodes being electrically connected to the inner ends of the corresponding leads.
Claim 3
Dependent Claim
43 words
A semiconductor device according to claim 1 in which said support frame is bent along the peripheral part thereof thereby to form a concavity for accommodating said semiconductor element, the inner concave surface of the support frame being lined with said insulative layer.
Claim 4
Dependent Claim
48 words
A semiconductor device according to claim 1 in which said support frame is of inverted tray shape in section with a concave inner surface to which said semiconductor element is bonded with an adhesive, and said periphery of the base member is secured to a printed wiring board.
References Cited (Backward Citations)
US4147889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |