More than one reissue application has been filed for the reissue of U.S. Pat. No. 6,573,536. The reissue applications are application Ser. No. 15/423,898 filed Feb. 3, 2017, which is the present application, and application Ser. No. 15/424,517 filed Feb. 3, 2017, which is a continuation reissue of the present application.
This application is a reissue application of U.S. Pat. No. 6,573,536, which issued on Jun. 3, 2003.
This invention pertains to lighting sources, in general, and to a lighting source that utilizes Light Emitting Diodes (LED's), in particular.
LED's have many advantages as light sources. However, in the past LED's have found application only as specialized light sources such as for vehicle brake lights, and other vehicle related lighting, and recently as flashlights. In these prior applications, the LED's are typically mounted in a planar fashion in a single plane that is disposed so as to be perpendicular to the viewing area. Typically the LED planar array is not used to provide illumination, but to provide signaling.
Recent attempts to provide LED light sources as sources of illumination have been few, and generally unsatisfactory from a general lighting standpoint.
It is highly desirable to provide a light source utilizing LED's that provides sufficient light output so as to be used as a general lighting source rather than as a signaling source.
One problem that has limited the use of LED's to specialty signaling and limited general illumination sources is that LED's typically generate significant amounts of heat. The heat is such that unless the heat is dissipated, the LED internal temperature will rise causing degradation or destruction of the LED.
It is therefore further desirable to provide an LED light source that efficiently conducts heat away from the LED's.
In accordance with the principles of the invention, an improved light source is provided. The light source includes an elongate thermally conductive member having an outer surface. A plurality of light emitting diodes is carried on the elongate member outer surface. At least some of the light emitting diodes are disposed in a first plane and others of said light emitting diodes are disposed in a second plane not coextensive with the first plane. Electrical conductors are carried by the elongate thermally conductive member and are connected to the plurality of light emitting diodes to supply electrical power thereto. The elongate thermally conductive member conducts heat away from the light emitting diodes.
In accordance with one aspect of the invention, an illustrative embodiment of the invention utilizes light emitting diodes that emit white light. However, other embodiments of the invention may utilize light emitting diodes that are of different colors to produce monochromatic light or the colors may be chosen to produce white light or other colors.
In accordance with another aspect of the invention the elongate thermally conductive member transfers heat from the light emitting diodes to a medium within said elongate thermally conductive member. In the illustrative embodiment of the invention, the medium is air.
In accordance with another aspect of the invention, the elongate thermally conductive member has one or more fins to enhance heat transfer to the medium.
In accordance with another aspect of the invention the elongate thermally conductive member comprises a tube. In one embodiment of the invention, the tube has a cross-section in the shape of a polygon. In another embodiment of the invention, the tube has a cross-section having flat portions.
In accordance with another embodiment of the invention, the elongate thermally conductive member comprises a channel.
In accordance with the principles of the invention, the elongate thermally conductive member may comprise an extrusion, and the extrusion can be highly thermally conductive material such as aluminum.
In one preferred embodiment of the invention the elongate thermally conductive member is a tubular member. The tubular member has a polygon cross-section. However, other embodiments my have a tubular member of triangular cross-section.
In one embodiment of the invention, a flexible circuit is carried on a surface of said elongate thermally conductive member; the flexible circuit includes the electrical conductors.
In another aspect of the invention, the flexible circuit comprises a plurality of apertures for receiving said plurality of light emitting diodes. Each of the light emitting diodes is disposed in a corresponding one of the apertures and affixed in thermally conductive contact with said elongate thermally conductive member.
The elongate thermally conductive member includes a thermal transfer media disposed therein in a flow channel.
At least one clip for mounting the elongate thermally conductive member in a fixture may be included.
The invention will be better understood from a reading of the following detailed description of a preferred embodiment of the invention taken in conjunction with the drawing figures, in which like reference indications identify like elements, and in which:
FIG. 7 is a cross-sectional view of a portion of an elongate heat sink with fins on an outer surface of the heat sink in accordance with some embodiments.
A light source in accordance with the principles of the invention may be used as a decorative lighting element or may be utilized as a general illumination device. As shown in
The exterior surface 107 of elongate heat sink 101 has a plurality of Light Emitting Diodes 109 disposed thereon. Each LED 109 in the illustrative embodiment comprises a white light emitting LED of a type that provides a high light output. Each LED 109 also generates significant amount of heat that must be dissipated to avoid thermal destruction of the LED. By combining a plurality of LEDs 109 on elongate heat sink 101, a high light output light source that may be used for general lighting is provided.
Conductive paths 129 are provided to connect LEDs 109 to an electrical connector 111. The conductive paths may be disposed on an electrically insulating layer 131 or layers disposed on exterior surface 107. In the illustrative embodiment shown in the drawing figures, the conductive paths and insulating layer are provided by means of one or more flexible printed circuits 113 that are permanently disposed on surface 107. As more easily seen in
Flexible printed circuit 113 has LED's 109 mounted to it in a variety of orientations ranging from 360 degrees to 180 degrees and possibly others depending on the application. Electrical connector 111 is disposed at one end of printed circuit 113. Connector 113 is coupleable to a separate power supply to receive electrical current. Flexible printed circuit 113, in the illustrative embodiment is coated with a non-electrically conductive epoxy that may be infused with optically reflective materials. Flexible printed circuit 113 is adhered to the tube 101 with a heat conducting epoxy to aid in the transmission of the heat from LEDs 109 to tube 101. Flexible printed circuit 113 has mounting holes 134 for receiving LEDs 109 such that the backs of LEDs 109 are in thermal contact with the tube surface 107.
Tubular heat sink 101 in the illustrative embodiment is formed in the shape of a polygon and may have any number of sides. Although tubular heat sink 101 in the illustrative embodiment is extruded aluminum, tubular heat sink 101 may comprise other thermal conductive material. Fins 105 may vary in number and location depending on particular LED layouts and wattage. In some instances, fins 108 may be added to the exterior surface of tubular heat sink 101(see, e.g., FIG. 7). In addition, apertures may be added to the tubular heat sink to enhance heat flow.
Light source 100 is mounted into a fixture and retained in position by mounting clips 121, 123 as most clearly seen in
Although light source 100 is shown as comprising an elongate tubular heat sink, other extruded elongate members may be used such as channels.
In the illustrative embodiment shown, convection cooling by flow of air through tubular heat sink 101 is utilized such that cool or unheated air enters tubular heat sink 101 at its lower end and exits from the upper end as heated air. In higher wattage light sources, rather than utilizing air as the cooling medium, other fluids may be utilized. In particular, convective heat pumping may be used to remove heat from the interior of the heat sink.
In one particularly advantageous embodiment of the invention, the light source of the invention is configured to replace compact fluorescent lighting in decorative applications.
As will be appreciated by those skilled in the art, the principles of the invention are not limited to the use of light emitting diodes that emit white light. Different colored light emitting diodes may be used to produce monochromatic light or to produce light that is the combination of different colors.
Although the invention has been described in terms of illustrative embodiments, it is not intended that the invention be limited to the illustrative embodiments shown and described. It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments shown and described without departing from the spirit or scope of the invention. It is intended that the invention be limited only by the claims appended hereto.
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OptoLum, Inc.'s Rule 3-1 Disclosure of Asserted Claims and Infringement Contentions. OptoLum, Inc. v. Cree, Inc., No. CV16-03828-PHX-DLR, United States District Court for the District of Arizona Phoenix Division, dated Apr. 21, 2017. 11 pages. (Exhibit D for Memorandum in Support of Cree Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, filed Dec. 29, 2017 in OptoLum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina. |
Letter from Keith Toms to Lynne Borchers and Peter Siddoway dated Nov. 3, 2017 regarding OptoLum v. Cree, 17-cv-00687. 2 pages. (Exhibit E for Memorandum in Support of Cree Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, filed Dec. 29, 2017 in OptoLum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina.) |
Final Office Action for U.S. Appl. No. 10/984,366, dated Nov. 1, 2006. 27 pages. (Exhibit F for Memorandum in Support of Cree Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, filed Dec. 29, 2017 in OptoLum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina.) |
Amendment After Final Rejection for U.S. Appl. No. 10/984,366, dated Feb. 1, 2007. 14 pages. (Exhibit G for Memorandum in Support of Cree Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, filed Dec. 29, 2017 in OptoLum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina.) |
Terminal Disclaimer to Obviate a Double Patenting Rejection Over a “Prior” Patent filed in U.S. Appl. No. 10/984,366 and signed on Feb. 1, 2007. 2 pages. (Exhibit H for Memorandum in Support of Cree Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, filed Dec. 29, 2017 in OptoLum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina.) |
Opposition of OptoLum, Inc. to Cree, Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112. Optolum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina, dated Feb. 5, 2018. 31 pages. |
Cree, Inc.'s Third Supplemental Rule 3-3 Invalidity Contentions and Disclosures. OptoLum, Inc. v. Cree, Inc., Civil Action No. 1:17-cv-00687. United States District Court for the Middle District of North Carolina dated Nov. 22, 2017. 33 pages. (Exhibit A for Opposition of OptoLum, Inc. to Cree, Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, dated Feb. 5, 2018). |
Transcript of Videotaped Deposition of A. Brent York, Dec. 1, 2017. OptoLum, Inc. vs. Cree, Inc., C.A. No. 1:17-cv-00687, United States District Court for the Middle District of North Carolina, 77 pages. (Exhibit B for Opposition of OptoLum, Inc. to Cree, Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, dated Feb. 5, 2018.) |
Non-Final Office Action for U.S. Appl. No. 10/984,366, dated Apr. 5, 2006. 53 pages. (Exhibit C for Opposition of OptoLum, Inc. to Cree, Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112. OptoLum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina, dated Feb. 5, 2018.) |
Transcript of Oral Deposition of Dr. Eric Bretschneider. Optolum, Inc. vs. Cree, Inc., Civil Action No. 1:17-cv-00687, United States District Court for the Middle District of North Carolina, date Nov. 29, 2017. (Exhibit D for Opposition of OptoLum, Inc. to Cree, Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112, dated Feb. 5, 2018.) |
Proposed Surreply of OptoLum, Inc. In Opposition to Cree, Inc.'s Motion for Summary Judgment for Invalidity of U.S. Pat. No. 7,242,038 under 35 U.S.C. §101, or in the Alternative, 35 U.S.C. §112. OptoLum, Inc. v. Cree, Inc., Civil Action No. 17-cv-0687-WO-JLW, United States District Court for the Middle District of North Carolina, dated Mar. 12, 2018. 13 pages. |
Number | Date | Country | |
---|---|---|---|
Parent | 10156810 | May 2002 | US |
Child | 15423898 | US |