US3893229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting for light-emitting diode pellet and method for the fabrication thereof
Assignee: QT Optoelectronics Inc
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Filing: 1973-10-29
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Granted: 1975-07-08
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Expires: 1993-10-29
Abstract
Abstract A layer of titanium is deposited on a glass substrate and a layer of gold is deposited over the layer of titanium. The titanium layer is approximately 100 to 1,000 A thick and the gold layer is approximately 5,000 to 15,000 A, thick. The goldtitanium layer is then masked and etched so that a selected portion of the glass substrate is exposed. The selected portion has dimensions slightly smaller than those of the surface of the N-layer of a gallium arsenide light-emitting diode pellet. A layer of germanium approximately 1,000 to 5,000 A thick is deposited over the gold-titanium layer and is masked and etched so that it, too, exposes the selected portion of the glass substrate. The light-emitting diode pellet is placed with the peripheral portion of the surface of its N-layer in overlapping contact with the germanium layer and the remainder of the surface of the N-layer in registry with the selected portion of the substrate. The light-emitting diode is then pressed against the germanium layer for several seconds at an elevated temperature sufficient to form a gold-germanium alloy which bonds the pellet to the titanium.
Inventors
- 👤 Alanson D Aird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:27
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/83; H10H20/832; H10F; H10F99/00; H10H20/831
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
151 words
A METHOD FORMOUNTING A GALLIUM ARSENIDE LIGHT-EMITTING DIODE PELLET HAVING A LIGHT-EMITTING SURFACE TO A GLASS SUBSTRATE THE METHOD COMPRISING THE STEPS OF: A. FORMING A TITANIUM LAYER ON SAID GLASS SUBSTRATE, B. FORMING A GOLD LAYER ON SAID TITANIUM LAYER TO FORM A GOLD-TITANIUM LAYER, SAID GOLD-TITANIUM LAYER BEING IN A PATTERN WHICH EXPOSED A PORTION OF SAID GLASS SUBSTRATE, C. FORMING A GERMANIUM LAYER ON SAID GOLD-TITANIUM LAYER, SAID LAYER OF GERMANIUM COVERING A PORTION OF SAID GOLDTITANIUM LAYER PROXIMATE TO SAID EXPOSED OF SAID GLASS SUBSTRATE, D. PLACING SAID LIGHT-EMITTING DIODE PELLET ON SAID GERMANIUM LAYER WITH SAID LIGHT-EMITTING SURFACE IN CONTACT THEREWITH SO THAT A PORTION OF SAID LIGHT-EMITTING SURFACE OVERLIES SAID EXPOSED PORTION OF SAID GLASS SUBSTRATE, AND E. BONDING SAID LIGHT-EMITTING DIODE PELLET TO SAID GERMANIUM LAYER UNDER PRESSURE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO CAUSE SAID GOLD LAYER AND SAID GERMANIUM
Claim 2
Independent Claim
151 words
A METHOD FORMOUNTING A GALLIUM ARSENIDE LIGHT-EMITTING DIODE PELLET HAVING A LIGHT-EMITTING SURFACE TO A GLASS SUBSTRATE THE METHOD COMPRISING THE STEPS OF: A. FORMING A TITANIUM LAYER ON SAID GLASS SUBSTRATE, B. FORMING A GOLD LAYER ON SAID TITANIUM LAYER TO FORM A GOLD-TITANIUM LAYER, SAID GOLD-TITANIUM LAYER BEING IN A PATTERN WHICH EXPOSED A PORTION OF SAID GLASS SUBSTRATE, C. FORMING A GERMANIUM LAYER ON SAID GOLD-TITANIUM LAYER, SAID LAYER OF GERMANIUM COVERING A PORTION OF SAID GOLDTITANIUM LAYER PROXIMATE TO SAID EXPOSED OF SAID GLASS SUBSTRATE, D. PLACING SAID LIGHT-EMITTING DIODE PELLET ON SAID GERMANIUM LAYER WITH SAID LIGHT-EMITTING SURFACE IN CONTACT THEREWITH SO THAT A PORTION OF SAID LIGHT-EMITTING SURFACE OVERLIES SAID EXPOSED PORTION OF SAID GLASS SUBSTRATE, AND E. BONDING SAID LIGHT-EMITTING DIODE PELLET TO SAID GERMANIUM LAYER UNDER PRESSURE AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO CAUSE SAID GOLD LAYER AND SAID GERMANIUM
Claim 3
Dependent Claim
48 words
The method recited in claim 1 wherein: a. said pattern is formed by masking and etching said gold-titanium layer; b. the step of forming said germanium layer comprises the sub-steps of: i. depositing a germanium layer on said gold-titanium layer, and ii. masking and etching said germAnium layer.
Claim 4
Dependent Claim
30 words
The method recited in claim 2 wherein: a. said gold layer is approximately 5,000 to 15,000 A thick; and b. said germanium layer is approximately 1,000 to 5,000 A thick.
Claim 5
Dependent Claim
64 words
The method recited in claim 3 wherein: a. before bonding said light-emitting diode pellet to said germanium layer, said glass substrate is placed on a table maintained at a temperature of approximately 300*C; and b. the step of bonding said light-emitting diode pellet to said germanium layer comprises forcing said light-emitting diode pellet against said germanium layer for several seconds using a heated probe.
Claim 6
Dependent Claim
58 words
The method recited in claim 2 wherein: a. said exposed portion of said glass substrate is rectangular; b. said germanium layer covers that portion of said gold-titanium layer proximate to said exposed portion of said glass substrate; and c. said light-emitting diode pellet is placed with the periphery of said light-emitting surface in contact with said germanium layer.
Claim 7
Dependent Claim
104 words
The method recited in claim 5 wherein: a. said gold layer is approximately 5,000 to 15,000 A thick; b. said germanium layer is approximately 1,000 to 5,000 A thick; c. before bonding said light-emitting diode pellet to said germanium layers, said glass substrate is placed on a table maintained at a temperature of approximately 300*C; and d. the step of bonding said light-emitting diode pellet to said germanium layer comprises forcing said light-emitting diode pellet against said germanium layer with a force of approximately 20 to 75 grams for 2 to 5 seconds using a probe which reaches a maximum temperature of approximately 500*C.
Claim 8
Dependent Claim
19 words
The method recited in claim 6 wherein said pattern includes a tab forming a terminal for said light-emitting surface.
Claim 9
Dependent Claim
48 words
The method recited in claim 2 wherein: a. said pattern is U-shaped having two legs; b. said germanium layer substantially covers said legs; and c. said light-emitting diode pellet is placed with two opposing sides of the periphery of said light-emitting surface in contact with said germanium layer.
Claim 10
Dependent Claim
104 words
The method recited in claim 8 wherein: a. said gold layer is approximately 5,000 to 15,000 A thick; b. said germanium layer is approximately 1,000 to 5,000 A thick; c. before bonding said light-emitting diode pellet to said germanium layer, said glass substrate is placed on a table maintained at a temperature of approximately 300*C; and d. the step of bonding said light-emitting diode pellet to said germanium layer comprises forcing said light-emitting diode pellet against said germanium layer with a force of approximately 20 to 75 grams for 2 to 5 seconds using a probe which reaches a maximum temperature of approximately 500*C.
Claim 11
Dependent Claim
19 words
The method recited in claim 9 wherein said pattern includes a tab forming a terminal for said light-emitting surface.
Claim 12
Dependent Claim
31 words
The method recited in claim 10 comprising the further step of bonding the light sensitive surface of a light-sensitive device to the surface of said glass substrate opposite said diode pellet.
Claim 13
Dependent Claim
25 words
The method recited in claim 11 wherein said step of bonding a light sensitive device comprises the step of bonding with a silicone rubber cement.
Claim 14
Dependent Claim
26 words
The method recited in claim 11 comprising the further step of bonding the surface of said light-sensitive device opposite said light-sensitive surface to a metal substrate.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |