Source: http://www.google.com/patents/US20040238930?dq=4393663
Timestamp: 2015-05-04 23:22:55
Document Index: 55533070

Matched Legal Cases: ['art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 8', 'art 22', 'art 22', 'art 2', 'art 2', 'art 2', 'art 12', 'art 2', 'art 2', 'art 2', 'art 2', 'arts 8', 'art 22', 'art 2', 'art 8', 'art 2', 'art 2', 'art 8', 'art 2', 'art 2', 'art 2', 'art 8', 'art 22', 'art 2', 'art 2', 'arts 8']

Patent US20040238930 - Surface-mountable light-emitting diode structural element - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA surface-mountable light emitting diode structural element in which an optoelectronic chip is attached to a chip carrier part of a lead frame, is described. The lead frame has a connection part disposed at a distance from the chip carrier part, and which is electrically conductively connected with an...http://www.google.com/patents/US20040238930?utm_source=gb-gplus-sharePatent US20040238930 - Surface-mountable light-emitting diode structural elementAdvanced Patent SearchPublication numberUS20040238930 A1Publication typeApplicationApplication numberUS 10/882,518Publication dateDec 2, 2004Filing dateJul 1, 2004Priority dateJul 29, 1997Also published asEP1004145A1, EP1004145B1, EP1566846A2, EP1566846A3, EP2267797A1, EP2267798A1, US6376902, US6469321, US6573580, US6759733, US7102215, US7183632, US7508002, US20020089047, US20030025170, US20030189236, US20060197103, US20070126098, WO1999007023A1Publication number10882518, 882518, US 2004/0238930 A1, US 2004/238930 A1, US 20040238930 A1, US 20040238930A1, US 2004238930 A1, US 2004238930A1, US-A1-20040238930, US-A1-2004238930, US2004/0238930A1, US2004/238930A1, US20040238930 A1, US20040238930A1, US2004238930 A1, US2004238930A1InventorsKarlheinz ArndtOriginal AssigneeOsram Opto Semiconductors GmbhExport CitationBiBTeX, EndNote, RefManReferenced by (17), Classifications (16), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetSurface-mountable light-emitting diode structural element
US 20040238930 A1Abstract
A surface-mountable light emitting diode structural element in which an optoelectronic chip is attached to a chip carrier part of a lead frame, is described. The lead frame has a connection part disposed at a distance from the chip carrier part, and which is electrically conductively connected with an electrical contact of the optoelectronic chip. The chip carrier part presents a number of external connections for improved conduction of heat away from the chip. The external connections project from a casing and at a distance from each other. Images(3) Claims(11)
DESCRIPTION OF THE PREFERRED EMBODIMENTS [0024] In all the figures of the drawing, sub-features and integral parts that correspond to one another bear the same reference symbol in each case. Referring now to the figures of the drawing in detail and first, particularly, to FIG. 1a thereof, there is shown a structural element, more specifically, a light diode structural element. The structural element has a light-emitting semiconductor chip 1 (LED chip) attached to a chip carrier part 2 of a lead frame 7 by a good heat-conducting material, for example by metal soldering. Three separate external connections 4, 5, 6 extend outwards in three different directions, starting from the chip carrier part 2. At a distance from the chip carrier part 2 with the external connections 4, 5, 6, a connection part a with an external connection 9 is disposed, which is connected with an electrical contact of the LED chip 1, e.g., with anode contacting, by use of a bond wire 16. A second contact metallizing (cathode is contacting) of the LED chip 1 is located, for example, at its lower side turned to the chip carrier part 2 and is electrically conductively connected with the chip carrier part 2 by an electrically conducting material. Consequently, the chip carrier part 2 with the external connections 4, 5, 6 serves in this case as both a cathode connection and as a thermal connection for heat conduction away from the LED chip 1. [0025] If the cathode contact is not disposed on a lower side of the chip 1, as in the above mentioned case, but instead on its upper side, for example, it can be connected electrically conductively with the chip carrier part 2 by a bond wire. [0026] The chip carrier part 2, the connection part 8, and partial areas of the external connections 4, 5, 6, 9 are encased by an essentially square foundation 10 of a casing 3, which has a recess 11 (FIG. 1b). The recess 11 essentially has the form of a truncated cone and extends from a main surface 17 of the foundation 10 running parallel to the lead frame 7 and up to the lead frame 7. A cross-section of the recess 11 increases from the lead frame 7 to the main surface 17 of the foundation 10. The LED chip 1 is located in the recess 11, which is provided with a radiation-permeable window part 22, preferably with a transparent plastic sealing. Together with the foundation 10, the window part 22 forms the casing 3 of the structural element. The external connections 4, 5, 6, 9 project from the latter on opposite side surfaces 18, 19 of the foundation 10. [0027] Starting from the chip carrier part 2, the external connections 4, 5, 6 run apart within the foundation 10 first in a stellate form and then break in their further course, so that they penetrate the side surfaces 18, 19 perpendicularly. [0028] The chip carrier part 2 preferably lies completely within a floor surface of the recess 11. [0029] The external connections 4, 5, 6 have longitudinal center axes 23, 24, 25 in an area in which they run outwards in the stellate form, two adjacent units of which always form an angle of about 90�. [0030] The external connections 4, 5, 6, 9 are bent outside of the foundation 10 first to a second main surface 20 of the foundation 10 opposite the first main surface 17 and in their further course below the foundation 10 to its center. However, as is indicated by the dotted line in FIG. 1b, they can also be bent to form rocker-shaped connection stumps. This also represents a form of external electrical connection usual in surface assembly technology. These kinds of external connections for surface-mountable structural elements (SMD) are known and therefore will not be illustrated further. [0031] The external connections 4, 5, 6, 9 are consequently formed so that they all lie simultaneously on the connection or lead plate in the assembled state of the structural element in the lead plate provided for assembling the structural element. [0032] Inner surfaces of the recess 11 form a reflector for the emission radiated by the LED chip 1 in the operation of the structural element. They are optionally coated with a reflection-enhancing material. The foundation 10 can alternatively consist of a reflection-enhancing material. [0033] In the execution example of FIG. 2 in distinction to the execution example of FIGS. 1a and 1 b, two differently colored lighting LED chips 1, 13 are attached to the chip carrier part 2 of the lead frame 7 by a thermally and electrically conducting material. The first 8 and a second connection part 12 are disposed on opposite sides of the chip carrier part 2 at a distance from it, each having an external connection 9, 14. The external connections 9, 14 run displaced parallel to each other; as seen from the chip carrier part 2, they extend in opposite directions to each other and extend out from the opposite side surfaces 18, 19 of the foundation 10. They are electrically conductively connected with the anode contacts of the LED chips 1, 13 by the bond wires 16. [0034] The chip carrier part 2 exhibits the two external connections 4, 5 which, starting from the chip carrier part 2, likewise extend displaced parallel to each other in opposite directions parallel to the external connections 9, 14 of the connection parts 8, 12 and project out on the opposite side surfaces 18, 19 of the foundation 10. [0035] As in the case of the first embodiment of FIGS. 1a and 1 b, the emission-impermeable foundation 10 has the truncated cone recess 11, which is provided with the transparent window part 22. The LED chips 1, 13 are located in the recess 11. [0036] The external connections 4, 5, 9, 14 project out of the foundation 10 on the opposite side surfaces 18, 19. They are formed outside the foundation 10 analogously to the first embodiment according to FIGS. 1a and 1 b. [0037] In the case of the first and second embodiments of FIGS. 1a, 1 b and 2 described above, the casing 3 and the external connections 4, 5, 6, 9, 14 are configured in all cases so that the emission transmitted from the LED chip 1 or chips 1, 13 in the operation of the structural element is radiated essentially perpendicularly to the assembly surface of the lead plate provided for the assembly of the structural element. [0038] The execution example of FIGS. 3a and 3 b relate to a so-called sideways emitting LED structural element. This type of structural element has already been explained in the general part of the specification. The casing 3 and the external connections 4, 5 and 9 of the chip carrier part 2 or the connection part 8 are configured in this structural element so that it can be attached to the side surface 20 of the foundation 10 to the assembly surface of the lead plate. [0039] Moreover, the lead frame 7 has the chip carrier part 2, which has at least two of the external connections 4, 5. Starting first from the chip carrier part 2, to which the LED chip 1 is attached by a thermally and electrically conducting material, the external connections 4, 5 extend in essentially opposite directions to the outside. In their further course, they break in the same direction, so that they then run parallel to each other in the same direction. The connection part 8 with the external connection 9, which runs parallel to the two external connections 4, 5 of the chip carrier part 2 in the same direction that they run, is disposed between the two external connections 4, 5 of the chip carrier part 2. [0040] The chip carrier part 2, whose external connections 4, 5, and the connection part 8 with the external connection 9 are enclosed by the radiation-impermeable foundation 10 analogously to the first and second embodiments described above, which has the truncated cone recess 11, is disposed in the LED chip 1. Here, too, the recess 11 is provided with the emission-permeable window part 22, which preferably consists of an emission-permeable plastic. The external connections 4, 5, 9, which project from it on one and the same side surface 18 of the foundation 10, are bent downward outside the foundation 10 in the direction of the back side of the foundation 10 and are bent in their further course along a back side 21 of the foundation 10 to its center. The outer surfaces of the external connections 4, 5, 9 turned away from the side surface 18 of the foundation 10 form a support surface of the structural element for its mounting on the lead plate. [0041] For additional cooling of the LED chip 1, the chip carrier part 2 has cooling fin 15 (indicated by dotted line in FIGS. 3a and 3 b). It projects out of the side surface 18, from which the external connections 4, 5, 9 project, on the opposite side surface 19 of the foundation 10 and is bent outside the foundation 10 to its back side, so that it lies on the side surface 19. Further cooling devices can optionally be attached thermally to the cooling fin 15. [0042] In all the embodiments described above, it is preferable for the external connections of the chip carrier part 2 to be wider than the external connections of the connection part or parts 8, 12. A further improved heat transfer from the LED chip 1 can thereby be attained with substantially unchanged housing dimensions. However, the external connections 4, 5, 6, 9, 14 can all have the same width. [0043] Especially large soldering pads are provided on the lead plate provided for the assembly of the structural element in order to attain a further improvement in heat transfer from the LED chip 1. They are also disposed in the stellate form and can thus distribute the heat conducted from the LED chip 1 over a large surface. The lead frames 7 of the structural elements according to the invention conduct the heat from the LED chip 1 in the stellate form to the outside of the casing 3. The heat is thereby fed to points in the plate lying far from each otter. [0044] Large metal linings consisting of copper are preferably located on the plate around each soldering pad, which distribute the heat on the lead plate. The heat resistance of the casing (housing) 3 according to the invention is distinctly reduced in comparison with the heat resistance of commercial housings. [0045] The housing 3 for the LED chips 1 described above relates to a housing for optoelectronic structural elements known in semiconductor technology. The separate forms and the materials and manufacturing processes used therefore will not be explained further. [0046] To be sure, the description of the invention on the basis of the disclosed embodiments is not to be understood to be a limitation is of the invention to these examples. Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7528414Feb 8, 2007May 5, 2009Industrial Technology Reseach InstituteLight emitting diode package structureUS7635915Apr 26, 2006Dec 22, 2009Cree Hong Kong LimitedApparatus and method for use in mounting electronic elementsUS7675145Mar 28, 2006Mar 9, 2010Cree Hong Kong LimitedApparatus, system and method for use in mounting electronic elementsUS7692206 *Nov 25, 2003Apr 6, 2010Cree, Inc.Composite leadframe LED package and method of making the sameUS7821023May 23, 2008Oct 26, 2010Cree, Inc.Solid state lighting componentUS8049230May 16, 2008Nov 1, 2011Cree Huizhou Opto LimitedApparatus and system for miniature surface mount devicesUS8217412Sep 16, 2010Jul 10, 2012Cree, Inc.Solid state lighting componentUS8362605Nov 9, 2009Jan 29, 2013Cree Huizhou Opto LimitedApparatus and method for use in mounting electronic elementsUS8367945Aug 16, 2006Feb 5, 2013Cree Huizhou Opto LimitedApparatus, system and method for use in mounting electronic elementsUS8368112Jan 14, 2009Feb 5, 2013Cree Huizhou Opto LimitedAligned multiple emitter packageUS8564004Nov 29, 2011Oct 22, 2013Cree, Inc.Complex primary optics with intermediate elementsUS8669572Jun 10, 2005Mar 11, 2014Cree, Inc.Power lamp packageUS8704245Mar 28, 2012Apr 22, 2014Renesas Electronics CorporationLED light source and method of manufacturing the sameUS8791471Nov 7, 2008Jul 29, 2014Cree Hong Kong LimitedMulti-chip light emitting diode modulesEP2011149A2 *Apr 25, 2007Jan 7, 2009Cree Hong Kong LimitedApparatus and method for use in mounting electronic elementsEP2011149A4 *Apr 25, 2007Dec 7, 2011Cree Huizhou Opto LtdApparatus and method for use in mounting electronic elementsEP2302709A2 *Jan 7, 2010Mar 30, 2011Kabushiki Kaisha ToshibaLight-emitting device* Cited by examinerClassifications U.S. Classification257/678International ClassificationH01L33/62, H01L33/48, H01L33/64Cooperative ClassificationH01L2924/12041, H01L33/647, H01L2224/48247, H01L2924/01068, H01L25/0753, H01L33/62, H01L33/642, H01L33/486, H01L2224/48091European ClassificationH01L33/64F, H01L33/62, H01L33/48C2Legal EventsDateCodeEventDescriptionFeb 28, 2014FPAYFee paymentYear of fee payment: 8Feb 9, 2010FPAYFee paymentYear of fee payment: 4Apr 22, 2008ASAssignmentOwner name: OSRAM GMBH, GERMANYFree format text: TO CORRECT THE ADDRESS OF THE ASSIGNEE, OSRAM GMBH;ASSIGNOR:OSRAM OPTO SEMICONDUCTORS GMBH;REEL/FRAME:020837/0132Effective date: 20041209Apr 16, 2008ASAssignmentOwner name: OSRAM GMBH, GERMANYFree format text: CORRECT THE ADDRESS OF THE ASSIGNEE OSRAM GMBH;ASSIGNOR:OSRAM OPTO SEMICONDUCTORS GMBH;REEL/FRAME:020808/0875Effective date: 20041209Jan 24, 2006ASAssignmentOwner name: OSRAM OPTO SEMICONDUCTORS GMBH & CO. OHG, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ARNDT, KARLHEINZ;REEL/FRAME:017207/0429Effective date: 20000207Owner name: OSRAM OPTO SEMICONDUCTORS GMBH, GERMANYFree format text: CHANGE OF NAME;ASSIGNOR:OSRAM OPTO SEMICONDUCTORS GMBH & CO. OHG;REEL/FRAME:017207/0434Effective date: 20020929Jan 31, 2005ASAssignmentOwner name: OSRAM GMBH, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OSRAM OPTO SEMICONDUCTORS GMBH;REEL/FRAME:015629/0627Effective date: 20041209RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services