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US5414293A
Expired / Lapsed
US
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Encapsulated light emitting diodes
Assignee: GlobalFoundries Inc
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Filing: 1993-04-19
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Granted: 1995-05-09
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Expires: 2013-04-19
Abstract
Abstract Encapsulation of semiconductor light emitting diodes, in particular laser diodes, characterized in that a gap is formed in an encapsulant, which is positioned in front of the light emitting facet of the diode, the gap preventing the encapsulant from adhering to the light emitting facet.
Inventors
- 👤 Ronald F. Broom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:11
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/8506; G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4202; H01; H01S; H01S5/00; H01S5/02; H01S5/022; H01S5/023; H01S5/02325; H01S5/02326; H10H20/855; H01S5/02218; H01S5/02234; H01S5/0225; H01S5/02251; H10H20/852; H10H20/853; H10W; H10W72/00; H10W72/50; H10W72/531; H10W72/536; H10W72/5363
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
An optical module comprising: a semiconductor light emitting diode mounted on a base and having a light emitting facet that includes a light emitting portion; and means for encapsulating and sealing said diode, wherein a gap contiguous to the light emitting facet of said diode is formed in said means for encapsulating, wherein at least said light emitting portion of said light emitting facet is placed in a defined atmosphere and remains free from said means for encapsulating, and wherein said gap has a width between 5 μm and 100 μm.
Claim 2
Dependent Claim
91 words
An optical module comprising: a semiconductor light emitting diode mounted on a base and having a light emitting facet that includes a light emitting portion; and means for encapsulating and sealing said diode, wherein a gap contiguous to the light emitting facet of said diode is formed in said means for encapsulating, wherein at least said light emitting portion of said light emitting facet is placed in a defined atmosphere and remains free from said means for encapsulating, and wherein said gap has a width between 5 μm and 100 μm.
Claim 3
Dependent Claim
72 words
The optical module as recited in claim 1, further comprising at least one optical output port which is positioned such that said gap is placed between the light emitting portion of said light emitting facet and said optical output port to provide an optical path starting at the light emitting portion of the light emitting facet of said diode, passing through the gap, and leaving the module via the optical output port.
Claim 4
Dependent Claim
34 words
The optical module as recited in claim 1, wherein said light emitting diode is a laser diode, and wherein said light emitting facet thereof is a facet that defines a cavity in the laser.
Claim 5
Dependent Claim
59 words
The optical module as recited in claim 2, further comprising an optical fiber for providing an optical output port, said fiber being aligned with respect to the light emitting portion of the diode, and wherein the optical path starts at the light emitting portion, passes through the gap into said optical fiber and exits the module via said fiber.
Claim 6
Dependent Claim
45 words
The optical module as in claim 4, wherein said fiber is prealigned in an alignment support having a v-shaped groove, its main axis being substantially perpendicular to the light emitting facet of the diode, and wherein said alignment support is integral to the mounting base.
Claim 7
Dependent Claim
34 words
The optical module as recited in claim 1, further characterized in that said encapsulating means is selected from a group that consists of cyclic alipathic epoxy resin, diglycidyl ester, polyurethan, and polymethyl methacrylate (PMMA).
Claim 8
Dependent Claim
16 words
The optical module as recited in claim 1, wherein said gap is placed under vacuum conditions.
Claim 9
Dependent Claim
16 words
The optical module as recited in claim 1, wherein said gap is filled with inert gas.
Claim 10
Dependent Claim
15 words
The optical module as recited in claim 1, wherein said gap is filled with air.
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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) | 1998-05-08 | 1998-11-07 | 1999-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-08 | 2002-11-07 | 2003-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-08 | 2006-11-07 | 2007-05-09 | $7700.00 | Window Closed / Lapsed |