Patent US4901137A successfully refreshed from Google Patents.
US4901137A
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US
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Electronic apparatus having semiconductor device
Assignee: Toshiba Corp
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Filing: 1988-07-28
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Granted: 1990-02-13
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Expires: 2008-07-28
Abstract
Abstract Disclosed is an electronic apparatus wherein a large power consumption type semiconductor device is mounted on a ceramic substrate of sintered aluminum nitride with high thermal conductivity for improving a heat dissipation effect. The electronic apparatus is, for example, an ignitor. The aluminum nitride-made ceramic substrate having the semiconductor device is provided in a metallic vessel made of aluminum or the like. Employed is a thermal stress strain-resistant adhesive agent with high thermal conductivity such as a silicone type adhesive agent for bonding. The thermal stress strain-resistant adhesive agent layer serves as a cushioning layer for a heating and cooling cycle and therefore improves a heat cycle resistance.
Inventors
- 👤 Hideki Sato
- 👤 Nobuyuki Mizunoya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:48
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/30; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; H10W70/68; H10W70/682; H10W72/071; H10W72/073; H10W72/07331; H10W72/07337; H10W72/381; H10W90/00; H10W90/701; H10W90/731; H10W90/734
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
An electronic apparatus, comprising a ceramic substrate of sintered aluminum nitride; a metallized layer formed on a first surface of said ceramic substrate; a semiconductor device mounted on said metallized layer; a metallic vessel for holding said ceramic substrate with said semiconductor device, bonded on an opposite surface of the first surface of said ceramic substrate by means of a thermal stress and strain-resistant adhesive agent; and wherein an internal portion of said metallic vessel is resin-sealed.
Claim 2
Dependent Claim
77 words
An electronic apparatus, comprising a ceramic substrate of sintered aluminum nitride; a metallized layer formed on a first surface of said ceramic substrate; a semiconductor device mounted on said metallized layer; a metallic vessel for holding said ceramic substrate with said semiconductor device, bonded on an opposite surface of the first surface of said ceramic substrate by means of a thermal stress and strain-resistant adhesive agent; and wherein an internal portion of said metallic vessel is resin-sealed.
Claim 3
Dependent Claim
20 words
The electronic apparatus of claim 1, wherein said thermal stress and strain-resistant adhesive agent is a silicone type adhesive agent.
Claim 4
Dependent Claim
14 words
The electronic apparatus of claim 2, wherein said metallic vessel is an aluminum vessel.
Claim 5
Dependent Claim
24 words
The electronic apparatus of claim 1, wherein said ceramic substrate of sintered aluminum nitride comprises not more than 20% by weight of sintering aid.
Claim 6
Dependent Claim
34 words
The electronic apparatus of claim 4, wherein said sintering aid is at least one material selected from the group consisting of rare earth elements, a compound of alkaline earth elements and an aluminum oxide.
Claim 7
Dependent Claim
43 words
The electronic apparatus of claim 1, wherein said metallized layer comprises at least one element selected from the group consisting of molybdenum, tungsten and tantalum and at least one element selected from the III group and the IVa group in the periodic table.
Claim 8
Dependent Claim
23 words
The electronic apparatus any one of claims 1 through 6, wherein said electronic apparatus is an ignitor having an ignition time control member.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |