| US 7,573,717 B2 | ||
| Cycling LED heat spreader | ||
| Bradley E. Reis, Westlake, Ohio (US); Martin David Smalc, Parma, Ohio (US); Brian J. Laser, Munroe Falls, Ohio (US); Gary Stephen Kostyak, Brunswick, Ohio (US); Prathib Skandakumaran, Cleveland, Ohio (US); Matthew G. Getz, Medina, Ohio (US); and Michael Frastaci, Parma, Ohio (US) | ||
| Assigned to GrafTech International Holdings Inc., Parma, Ohio (US) | ||
| Filed on Mar. 10, 2008, as Appl. No. 12/45,086. | ||
| Application 12/045086 is a continuation of application No. 11/466449, filed on Aug. 22, 2006, granted, now 7,365,988. | ||
| Application 11/466449 is a continuation in part of application No. 11/339338, filed on Jan. 25, 2006, granted, now 7,303,005. | ||
| Application 11/339338 is a continuation in part of application No. 11/267933, filed on Nov. 04, 2005. | ||
| Prior Publication US 2008/0218977 A1, Sep. 11, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H05K 7/20 (2006.01) | ||
| U.S. Cl. 361—719 [361/704; 257/706; 257/712; 165/80.3] | 9 Claims |
| 1. An electronic device, comprising:
a light source assembly including:
a substrate including an electrical circuit, the substrate having first and second major surfaces;
a light emitting diode located adjacent a first major surface of the substrate and connected to the electrical circuit; and
a heat spreader including a sheet of graphite, the heat spreader being in heat conducting association with the light emitting
diode,
wherein the light emitting diode can be cycled on and off for at least two cycles which occur with a time period of no more
than 10 seconds without an appreciable rise in the maximum temperature of the light emitting diode from cycle to cycle.
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