US3590338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light activated semiconductor device
Assignee: Westinghouse Electric Corp
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Filing: 1969-11-28
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Granted: 1971-06-29
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Expires: 1989-11-28
Abstract
Abstract This disclosure relates to a new and novel encapsulating package for a light-activated or light-sensitive semiconductor device. The various problems associated with introducing light through the top or cap of the encapsulating case especially the establishment of a hermetic seal are overcome by introducing light through an aperture in the base member of the case and establishing a hermetic seal by employing a soft silver layer which is disposed on the surface of the base member in contact with the semiconductor wafer.
Inventors
- 👤 John S Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:50
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4202; G02B6/4248; G02B6/4295; H; H10; H10F; H10F30/00; H10F30/20; H10F30/21; H10F30/26; H10F30/263; H10F77/00; H10F77/50; H10W; H10W72/00; H10W72/20; H10W72/30; H10W72/071; H10W72/073; H10W72/07331; H10W72/07336
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
The device of claim 1 in which said aluminum contact is at least 40,000 A. thick.
Claim 2
Dependent Claim
27 words
The device of claim 1 in which the compressive pressure at the inner face between the aluminum contact and the silver layer is at least 2,500 p.s.i.
Claim 3
Dependent Claim
28 words
The device of claim 1 in which the base member of the case has a stud portion affixed thereto and the aperture extends entirely through said stud portion.
Claim 4
Dependent Claim
19 words
The device of claim 1 in which the silver layer is brazed to the base member about the aperture.
Claim 5
Dependent Claim
25 words
The device of claim 1 in which an electrical lead is in electrical contact with the second electrical contact and extends through said cap member.
Claim 6
Dependent Claim
242 words
A light-activated semiconductor device comprising a semiconductor element, said element comprising a wafer of semiconductor material having four regions of alternate-type conductivity with a PN junction between adjacent regions formed therein, the wafer having opposed major surfaces, the end region of said wafer constituting emitter regions, the two middle regions constituting base regions, one of said base regions having a portion extending through the adjacent emitter region and being exposed at one of the major surfaces, an aluminum electrical contact disposed only on the emitter region surrounding said portion of said base region, a second electrical contact affixed to the other major surface of the wafer, a case member completely surrounding said element, said case member being comprised of a base member and a cap member, said base member having a flat portion, walls of said flat portion forming an aperture therein, said aperture extending entirely through said flat portion, a layer of silver disposed on a portion of the top surface of said flat portion about said aperture, said element disposed in the flat portion the aluminum electrical contact on said emitter region in contact with said silver layer, the portion of said base region extending to said major surface disposed over said aperture, the cap member of said case member disposed about said element and hermetically sealed to said base member and compression means for holding said aluminum electrical contact in intimate, electrical and thermal contact with said silver layer.
Claim 7
Dependent Claim
195 words
A light-activated semiconductor device comprising a semiconductor element, said element comprising a wafer of semiconductor material having at least two regions of alternate-type conductivity with a PN junction between adjacent regions formed therein, the wafer having opposed major surfaces, an aluminum electrical contact disposed on only a portion of one of the major surfaces, a second electrical contact affixed to the other major surface of the wafer, a case member completely surrounding said element, said case member being comprised of a base member and a cap member, said base member having a flat portion, walls of said flat portion forming an aperture therein, said aperture extending entirely through said flat portion, a layer of silver disposed on a portion of the top surface of said flat portion about said aperture, said element disposed on the flat portion the aluminum electrical contact in contact with said silver layer, the remaining portion of the major surface disposed over said aperture, the cap member of said case member disposed about said element and hermetically sealed to said base member and compression means for holding said aluminum electrical contact in intimate, electrical and thermal contact with said silver layer.
Claim 8
Dependent Claim
28 words
The device of claim 8 in which the base member of the case has a stud portion affixed thereto and the aperture extends entirely through said stud portion.
Claim 9
Dependent Claim
19 words
The device of claim 8 in which the silver layer is brazed to the base member about the aperture.
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |