Source: http://www.google.com/patents/US8167674?dq=5311516
Timestamp: 2016-07-27 20:24:18
Document Index: 656632589

Matched Legal Cases: ['application No. 08', 'Application No. 08171399', 'Application No. 05808825', 'Application No. 2006', 'Application No. 2006', 'Application No. 2009', 'Application No. 2009', 'Application No. 10', 'Application No. 093128231', 'Application No. 200780050127', 'Application No. 05808825']

Patent US8167674 - Phosphor distribution in LED lamps using centrifugal force - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method of manufacturing an LED lamp is disclosed. The method includes admixing an uncured curable liquid resin and a phosphor, dispensing the uncured admixture on an LED chip, centrifuging the chip and the admixture to disperse the phosphor particles in the uncured resin, and curing the resin while...http://www.google.com/patents/US8167674?utm_source=gb-gplus-sharePatent US8167674 - Phosphor distribution in LED lamps using centrifugal forceAdvanced Patent SearchPublication numberUS8167674 B2Publication typeGrantApplication numberUS 11/956,989Publication dateMay 1, 2012Priority dateDec 14, 2007Fee statusPaidAlso published asEP2071636A1, EP2071636B1, US20090153022Publication number11956989, 956989, US 8167674 B2, US 8167674B2, US-B2-8167674, US8167674 B2, US8167674B2InventorsChristopher P. Hussell, David T. EmersonOriginal AssigneeCree, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (163), Non-Patent Citations (63), Referenced by (20), Classifications (15), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetPhosphor distribution in LED lamps using centrifugal force
US 8167674 B2Abstract
In order to deal with these difficulties, most conventional techniques attempt to maintain the viscosity of the uncured resin within a range that permits the phosphor to settle within the encapsulant under the influence of gravity. This in turn requires controlling the length of time (“working time”) during which the resin will cure—the phosphor should reach the desired position(s) before the resin cures—as well as the temperature in an effort to maintain a favorable viscosity while the phosphor is settling. For example, at room temperature (25� C.), a typical 2-part silicon resin (e.g. SR-7010 from Dow Corning) will normally cure in about one minute at 150� C. and its viscosity will double (from respective starting points of about 20000 and 7000 millipascal for the parts) in about three (3) hours at room temperature.
As noted earlier, the term LED chip refers to the basic semiconductor structure that emits the desired frequencies. As noted in the background, the structure and operation of light emitting diodes is well understood by persons of skill in this art and need not be discussed in detail herein. Exemplary structures are, however, typically formed from the Group III nitride material system and commercial examples are available from Cree, Inc., the assignee of the present invention, for example under the XLAMP� XR-E designation. Although the boundaries are somewhat arbitrary, blue light tends to fall in the 440-470 nanometer range and thus the blue-emitting XLAMP� XR-E chips will typically have a predominant wavelength of between about 450 and 465 nanometers. Other exemplary chips emit in other portions (e.g., red and green) of the spectrum and the invention can be applied to these as well.
Commercially available centrifuges are entirely appropriate for the process. For example, centrifuges that are useful for separating biological suspensions are quite suitable for purposes of the invention. Examples are well known to those of ordinary skill in the laboratory arts and include a number of those available from companies such as Beckman Coulter, with the ALLEGRA� X-12 benchtop centrifuge having been used successfully for this purpose (Beckman Coulter, Inc., 4300 N. Harbor Boulevard, P.O. Box 3100, Fullerton, Calif. 92834-3100, USA). This centrifuge has a maximum speed of 10,200 rpm with a fixed angle rotor and 3,750 rpm with a swinging bucket rotor of the type illustrated in FIG. 5.
FIGS. 1-4 are illustrate diodes that can be made according to the invention. FIG. 1 illustrates an LED lamp broadly designated at 10 in perspective view that is similar to the Cree XLAMP� diodes referred to earlier. The diode 10 includes an LED chip 11 (FIGS. 2-4) which as noted earlier emits in the higher energy portions of the visible spectrum or in the near ultraviolet portions and is typically formed in the Group III nitride material system. The chip 11 sits in a cup 12 which in the illustrated embodiments also serves as a reflector for the lamp 10.
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