US5785418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally protected LED array
Assignee: FOY DENNY
•
Filing: 1997-10-20
•
Granted: 1998-07-28
•
Expires: 2017-10-20
Abstract
Abstract An electrically driven L.E.D. lamp assembly (14) comprising an electrically insulating circuit board (26) having opposed first and second surfaces with light emitting diodes (28) having positive and negative leads (30, 32) mounted on the first surface. A plurality of pads (50) of thermally conductive plating are disposed on the second side with each pad (50) associated with the leads to conduct heat from each of the leads to one of the pads (50). A heat sink includes a base (36) overlying the second surface and layers (56, 58) of thermally conductive and electrically non-conductive material are disposed between the conductive plating and the heat sink (36) to secure the conductive plating and the circuit board (26) to the heat sink (36) while preventing a short between the conductive plating (50) and the heat sink (36). The assembly is characterized by a thermally insulating material (44) disposed over the heat sink (36) for sandwiching the heat sink against the conductive plating (50) to limit heat transfer into the heat sink from the outside.
Inventors
- 👤 Peter A. Hochstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:01
CPC Classifications
F; F21; F21S; F21S45/00; F21S45/40; F21S45/47; F21S45/48; B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/2696; B61; B61L; B61L5/00; B61L5/12; B61L5/18; B61L5/1809; B61L5/1854; F21S43/00; F21S43/10; F21S43/13; F21S43/14; F21S45/30; F21S45/37; F21V; F21V29/00; F21V29/50; F21V29/70; F21V29/74; F21V29/83; F21V29/85; F21V29/89; G; G08; G08G; G08G1/00; G08G1/09; G08G1/095; H; H05; H05K; H05K1/00; H05K1/02; H05K1/0201; H05K1/0203; H05K1/0204; H05K1/0206; H05K3/00; H05K3/0058; H05K3/0061; H10; H10H; H10H20/00; H10H20/80; H10H20/85; H10H20/858; B61L2207/00; B61L2207/02; F21W; F21W2111/00; F21W2111/02; F21Y; F21Y2115/00; F21Y2115/10; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/09; H05K2201/09209; H05K2201/09654; H05K2201/09781; H05K2201/10; H05K2201/10007; H05K2201/10106; H05K3/40; H05K3/42; Y; Y10; Y10S; Y10S362/00; Y10S362/80
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
An electrically driven L.E.D. lamp assembly comprising; a heat sink having first and second faces, an array of light emitting diodes disposed over said first face of said heat sink, each of said light emitting diodes having positive and negative leads, an electrically conductive circuit interconnecting said leads, electrically insulating means for electrically insulating said conductive circuit and said light emitting diodes from said first face of said heat sink, said assembly characterized by a thermally insulating material disposed over said second face of said heat sink for limiting heat transfer to said heat sink from sources other than said light emitting diodes.
Claim 2
Dependent Claim
103 words
An electrically driven L.E.D. lamp assembly comprising; a heat sink having first and second faces, an array of light emitting diodes disposed over said first face of said heat sink, each of said light emitting diodes having positive and negative leads, an electrically conductive circuit interconnecting said leads, electrically insulating means for electrically insulating said conductive circuit and said light emitting diodes from said first face of said heat sink, said assembly characterized by a thermally insulating material disposed over said second face of said heat sink for limiting heat transfer to said heat sink from sources other than said light emitting diodes.
Claim 3
Dependent Claim
17 words
An assembly as set forth in claim 1 including a heat shield surrounding said thermally insulating material.
Claim 4
Dependent Claim
30 words
An assembly as set forth in claim 1 wherein said heat sink includes a heat dissipator portion extending away from said insulating material to convey heat from said conductive plating.
Claim 5
Dependent Claim
15 words
An assembly as set forth in claim 3 including a housing supporting said heat sink.
Claim 6
Dependent Claim
18 words
An assembly as set forth in claim 4 wherein said housing defines a space around said heat shield.
Claim 7
Dependent Claim
18 words
An assembly as set forth in claim 5 including a gasket supporting said heat sink in said housing.
Claim 8
Dependent Claim
56 words
An assembly as set forth in claim 6 wherein said housing comprises a traffic light housing presenting a light emitting opening and a sun hood extending from said opening, said heat dissipator portion comprising a shell extending forwardly of said light emitting diodes, said shell extending from said opening within and spaced from said sun hood.
Claim 9
Dependent Claim
17 words
An assembly as set forth in claim 7 wherein said shell includes perforations therein for radiating heat.
Claim 10
Dependent Claim
164 words
An assembly as set forth in claim 8 including an electrically insulating circuit board having opposed first and second surfaces, said light emitting diodes mounted on said first surface, a thermally conductive plating on said second surface, said conductive plating being thermally connected to said leads to conduct heat from said leads to said conductive plating, said first face of said heat sink overlying said conductive plating, said electrically insulating means comprising a thermally conductive layer disposed between said conductive plating and said first face of said heat sink to secure said conductive plating and said board to said first face of said heat sink, said conductive plating comprising a plurality of pads disposed on said second surface of said circuit board, said thermally conductive material comprising an adhesive layer of electrically insulating adhesive disposed between said pads and said first face of said heat sink, and a second electrically insulating material for preventing the adhesive from being thin enough to cause electrical shorting.
Claim 11
Dependent Claim
44 words
An assembly as set forth in claim 8 wherein said electrically insulating means comprises a coating disposed over said first face of said heat sink, said electrically conductive circuit disposed on said coating, and an electrically conductive adhesive connecting said leads to said circuit.
Claim 12
Dependent Claim
62 words
An assembly as set forth in claim 8 wherein said electrically insulating means comprises a coating disposed over said first face of said heat sink, a metal substrate disposed over said coating, a thermally conductive and electrically insulating layer on said substrate, said electrically conductive circuit disposed on said insulating layer, and an electrically conductive adhesive connecting said leads to said circuit.
References Cited (Backward Citations)
US4729076A
Cited
US4733335A
Cited
US5038255A
Cited
US5528474A
Cited
US5632551A
Cited
US5695275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-27 | 2002-01-26 | 2002-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-27 | 2006-01-26 | 2006-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-27 | 2010-01-26 | 2010-07-28 | $7700.00 | Window Closed / Lapsed |