Source: http://www.google.com/patents/US20040075100?dq=No.+6,411,949
Timestamp: 2014-07-12 23:05:54
Document Index: 2710725

Matched Legal Cases: ['arts 12', 'art 4', 'arts 12', 'art 12', 'art 4', 'art 4', 'art 12', 'art 12', 'art 4', 'art 12', 'art 4', 'art 4', 'art 12', 'art 12', 'arts 12', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 12', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4']

Patent US20040075100 - Leadframe and housing for radiation-emitting component, radiation-emitting ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA leadframe, a housing, a radiation-emitting component formed therefrom, and a method for producing the component includes the leadframe having a mount part with at least one bonding wire connecting area and at least one electrical solder connecting strip into which a separately manufactured thermal...http://www.google.com/patents/US20040075100?utm_source=gb-gplus-sharePatent US20040075100 - Leadframe and housing for radiation-emitting component, radiation-emitting component, and a method for producing the componentAdvanced Patent SearchPublication numberUS20040075100 A1Publication typeApplicationApplication numberUS 10/683,712Publication dateApr 22, 2004Filing dateOct 10, 2003Priority dateApr 10, 2001Also published asCN1602555A, CN100359702C, CN100539225C, CN101154703A, DE10117889A1, EP1378013A2, US8097937, WO2002084749A2, WO2002084749A3Publication number10683712, 683712, US 2004/0075100 A1, US 2004/075100 A1, US 20040075100 A1, US 20040075100A1, US 2004075100 A1, US 2004075100A1, US-A1-20040075100, US-A1-2004075100, US2004/0075100A1, US2004/075100A1, US20040075100 A1, US20040075100A1, US2004075100 A1, US2004075100A1InventorsGeorg Bogner, Herbert Brunner, Michael Hiegler, Gunter WaitlOriginal AssigneeGeorg Bogner, Herbert Brunner, Michael Hiegler, Gunter WaitlExport CitationBiBTeX, EndNote, RefManReferenced by (83), Classifications (19), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetLeadframe and housing for radiation-emitting component, radiation-emitting component, and a method for producing the componentUS 20040075100 A1Abstract A leadframe, a housing, a radiation-emitting component formed therefrom, and a method for producing the component includes the leadframe having a mount part with at least one bonding wire connecting area and at least one electrical solder connecting strip into which a separately manufactured thermal connecting part, which has a chip mounting area, is linked. To form a housing, the leadframe is sheathed, preferably, with a molding compound, with the thermal connecting part being embedded such that it can be thermally connected from the outside. Images(4) Claims(50)
DESCRIPTION OF THE PREFERRED EMBODIMENTS [0064] Referring now to the figures of the drawings in detail and first, particularly to FIG. 1 thereof, there is shown a leadframe 2 having a mount part, which is subdivided into two electrical connecting parts 12 a, 12 b, and a thermal connecting part 4. The two electrical connecting parts 12 a, 12 b end in a respective solder connecting strip 3 a, 3 b. [0065] One electrical connecting part 12 a has an opening in the form of an eye. The thermal connecting part 4 is linked into the eye opening. For such a purpose, by way of example, the thermal connecting part 4 may be inserted with an accurate fitting into the eye opening in the electrical connecting part 12 a, after which it is crimped to the electrical connecting part 12 a in the form of a rivet. Alternative connections on the circumference between the thermal connecting part 4 and the electrical connecting part 12 a, for example, by riveting, soldering, or welding, likewise are possible. [0066] The thermal connecting part 4 is substantially rotationally symmetrical and has projections 19 that allow the leadframe 2 to be anchored in a robust manner in a housing. Furthermore, the thermal connecting part 4 has a central recess in the form of a reflector well 16, on whose base surface a chip-mounting area 11 is provided for holding a radiation-emitting chip. The side surfaces of the recess are used as reflector surfaces. [0067] The eye ring of the electrical connecting part 12 a has a cutout 13, at which a bonding wire connecting area 10, which is in the form of a tongue, of the second electrical connecting part 12 b overlaps. The bonding wire connecting area 10 is disposed at a different height to that edge of the reflector well 16 that emits radiation. For chip mounting purposes, the configuration allows short wire connections between the chip and the bonding wire connecting area 10 without any need for a cutout for this purpose at the edge of the reflector well 16 in the thermal connecting part. [0068]FIG. 2 shows a perspective longitudinal section through one exemplary embodiment of a housing according to the invention. The housing has a base body 1 composed of a plastic molding compound that, for example, can be produced by an injection-molding or injection-compression method. The molding compound is composed, for example, of a plastic material based on epoxy resin or acryl resin, but may also be composed of any other material that is suitable for the present purpose. [0069] A leadframe 2, which corresponds substantially to FIG. 1, and having two electrical connecting parts 12 a, 12 b and a thermal connecting part 4 linked in it as well as solder connecting strips 3 a, 3 b, is embedded in the base body 1, with the solder connecting strips 3 a, 3 b projecting out of the housing base body 1. Thermal connecting part 4 is formed in a largely planar manner, without a reflector well, on the side of the chip connecting area 11. [0070] The thermal connecting part 4 is, in this case, disposed within the housing base body 1 such that the base surface 6 of the thermal connecting part 4 forms a part of the base body contact surface 7. To provide a mechanically robust anchorage in the housing base body 1, the thermal connecting part 4 is provided with projections 19 disposed on the circumference. [0071] Opposite the contact surface 7, a recess 8 is formed as a radiation outlet window in the housing base body 1 and leads to the chip mounting area 11 on the thermal connecting part 4 so that a radiation-emitting chip that is to be mounted thereon is located within the radiation outlet window 8. The side surfaces 9 of the radiation outlet window 8 are inclined, and are used as reflectors for the radiation that is produced by a chip such as this during operation. [0072]FIG. 3 shows a perspective view of the contact surface 7 of a further exemplary embodiment of a housing according to the invention. As in the exemplary embodiment already described, the base surface 6 of the thermal connecting part 4 is passed out of the housing base body 1. In such a case, the base surface 6 of the thermal connecting part 4 projects somewhat out of the base body 1 so that, when the thermal connecting part 4 is installed, the configuration ensures reliable contact and a good thermal junction between the thermal connecting part 4 and a corresponding mount, such as a printed circuit board for a heat sink. [0073] In contrast to the exemplary embodiment described above, the housing base body 1 has a groove 20 at the side, running from the thermal connecting part 4 to a side surface of the housing base body 1. If the housing is mounted on a mount, then the groove 20 allows the connection between the housing and the mount to be checked, when installed. In particular, this makes it possible to check a soldered connection between the mount and the thermal connecting part 4. [0074]FIG. 4 shows a schematic, perspective view of one exemplary embodiment of a radiation-emitting component according to the invention. [0075] As in the case of the exemplary embodiment that has already been described, a leadframe 2 with a thermal connecting part 4 linked to it is largely embedded in the housing base body 1 so that only the solder connecting strips 3 a, 3 b project out of the housing base body 1 at the side. The thermal connecting part 4 forms (in a manner that is not illustrated) a part of the contact surface 7 of the housing base body, and can, thus, be thermally connected from the outside. [0076] A radiation-emitting chip 5 such as a light-emitting diode is mounted on the chip mounting area 11 of the thermal connecting part 4, and is, preferably, a semiconductor chip, for example, an LED chip or a laser chip, which is soldered to the thermal connecting part 4 by a silver solder. Alternatively, the chip 5 may be adhesively bonded to the chip mounting area 11 using an adhesive that has sufficient thermal conductivity and is, preferably, also electrically conductive. [0077] Semiconductor materials based on gallium arsenide, gallium phosphide, and gallium nitride, such as GaAlAs, InGaAs, InGaAlAs, InGaAlP, GaN, GaAlN, InGaN, and InGaAlN are suitable particularly as efficient radiation sources. [0078] The component housing substantially corresponds to the housing illustrated in FIGS. 2 and 3. In contrast thereto, the thermal connecting part 4 has a reflector well 16 that surrounds the chip 5. The reflector surfaces of this reflector well 16 merge substantially smoothly into the side surfaces 9 of the radiation outlet window 8, resulting in an overall reflector that is composed of an area element formed by the thermal connecting part 4 and an area element formed by the side surfaces 9 of the radiation outlet window 8. [0079] The radiation outlet window 8 is also extended somewhat in the longitudinal direction of the component and has a bonding wire connecting area 10 on that electrical connecting part 12 b of the leadframe 2 that is not connected to the thermal connecting part 4. A wire connection 17 is passed from the bonding wire connecting area 10 to a contact surface on the chip 5. [0080] The bonding wire connecting area 10 is disposed at a different height to that edge of the reflector well 16 of the thermal connecting part 4 that is on the side that emits radiation. Such a configuration allows a short, and, thus, mechanically robust, wire connection between the chip 5 and the bonding wire connecting area 10 because the latter can be moved close to the chip 5. Furthermore, the height of the wire clip that is produced in this way is kept small, thus reducing the risk of a short-circuit that could occur, for example, if the chip were covered with encapsulation by folding the wire connection 17 over onto the thermal connecting part 4 at the side. [0081]FIG. 5 shows a cross-section through a further exemplary embodiment of the component according to the invention. The section profile corresponds to the line A-A shown in FIG. 4. [0082] As in the case of the exemplary embodiment illustrated in FIG. 3, the thermal connecting part is recessed centrally on the mounting face for the chip 5 to result in a reflector well 16 for the radiation that is produced by the chip 5, to which the reflector side walls 9 of the radiation outlet window 8 are connected. [0083] In contrast to the previous exemplary embodiment, the overall reflector 15 formed in this way has a kink at the junction point between the reflector elements 9, 16. The kink shape results in the overall reflector 15 being a better approximation to a paraboloid of rotation, thus resulting in an advantageous radiation emission characteristic. The light that is emitted from the chip 5 at a steep angle with respect to the base surface of the well is deflected to a greater extent towards the main radiation emission direction 27 of the component. [0084] To protect the chip 5, the radiation outlet window 8 is filled with encapsulation 14, for example, a reaction resin such as epoxy resin or acryl resin. To focus the radiation that is produced, the encapsulation 14 may be shaped as a lens, with a slightly curved surface 18. [0085] To achieve a mechanically robust connection between the encapsulation 14, the housing base body 1, and the leadframe 2, it is advantageous to choose the height A of the reflector well 16 in the thermal connecting part to be less than twice the height H of the chip 5. The height B of the overall reflector 15 that is formed by the thermal connecting part 4 and the housing base body 1 should be less than four times the height H of the chip 5. Finally, it is advantageous to shape the radiation outlet window 8 such that the above-mentioned relationship: V≦q�H [0086] is satisfied for the volume V of encapsulation, where q is less than 10 mm2 and is, preferably, approximately 7 mm2. Compliance with these measures advantageously improves the mechanical robustness and, hence, the load capacity and life of the component. This aim is, likewise, contributed to by using the projections 19 in the housing base body 1 to anchor the thermal connecting part 4. [0087] To produce such a component, a mount part (which, for example, is stamped from a mount strip) is, first of all, provided with an opening for the leadframe 2. The thermal connecting part 4 is, then, inserted into the opening in the mount part, and is crimped to the mount part. [0088] In the next step, the radiation-emitting chip 5 is fitted to the thermal connecting part 4, for example, by being soldered or adhesively bonded onto the thermal connecting part 4. To form the housing base body 1, the leadframe 2 that is formed from the mount part and the thermal connecting part 4 is sheathed, together with the already installed chip 5, by a molding compound, except for that area that surrounds the chip 5, as well as the bonding wire connecting area 10. This may be done, for example, using an injection-molding or injection-compression method. Finally, a wire connection 17 is passed from the bonding wire connecting area 10 to a contact surface on the chip 5. [0089] Alternatively, after the connection of the mount part and the thermal connecting part 4, the leadframe 2 so formed is, first of all, sheathed in the molding compound, and the chip 5 is, then, mounted on the chip connecting area 11, preferably, by being adhesively bonded to it, and contact is made with it. [0090] The explanation of the invention based upon the described exemplary embodiments does not, of course, represent any restriction of the invention to the exemplary embodiment. Furthermore, leadframes and housings according to the invention can also be used for other components that require efficient heat dissipation, and other types of semiconductor body may be used as the chip. [0091] The method described above, including the steps providing a leadframe and fitting of the chip, preferably, by soldering it on, before sheathing of the leadframe with a molding compound, with the area around the chip being left free, can also be transferred to other housing forms without a thermal connecting part, and represents an invention in its own right. [0092] The advantages of the method are, in particular, that mounting of the chip can largely be optimized independently of the characteristics of the molding compound. By way of example, a soldering process can be carried out in an extended temperature range. In such a case, it is possible to use solders, preferably, with a melting temperature above 260� C. such as silver solders, which form a connection with a very low thermal resistance between the chip and the leadframe. Furthermore, this makes it possible to reduce the risk of the chip becoming detached and the corresponding component being soldered onto a printed circuit board. 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H01L33/48Cooperative ClassificationH01L2224/32245, H01L2924/12041, H01L2224/73265, H01L33/486, H01L2224/48091, H01L33/62, H01L33/642, H01L2924/01079, H01L2924/01057, H01L2224/48247European ClassificationH01L33/64C, H01L33/62Legal EventsDateCodeEventDescriptionSep 10, 2013CCCertificate of correctionAug 30, 2012ASAssignmentOwner name: OSRAM AG, GERMANYEffective date: 20120604Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HAENGGI, ROLF;REEL/FRAME:028873/0971Apr 17, 2012CCCertificate of correctionNov 15, 2011ASAssignmentEffective date: 20110719Free format text: CHANGE OF NAME;ASSIGNOR:OSRAM GMBH;REEL/FRAME:027228/0508Owner name: OSRAM AG, GERMANYOct 24, 2005ASAssignmentOwner name: OSRAM GMBH, GERMANYFree format text: CONIFIRMATORY ASSIGNMENT;ASSIGNOR:OSRAM OPTO SEMICONDUCTORS GMBH;REEL/FRAME:016931/0305Effective date: 20050908Feb 28, 2005ASAssignmentOwner name: OSRAM OPTO SEMICONDUCTORS GMBH, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOGNER, GEORG;BRUNNER, HERBERT;HIEGLER, MICHAEL;AND OTHERS;REEL/FRAME:016312/0458;SIGNING DATES FROM 20031030 TO 20031103Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOGNER, GEORG;BRUNNER, HERBERT;HIEGLER, MICHAEL;AND OTHERS;SIGNING DATES FROM 20031030 TO 20031103;REEL/FRAME:016312/0458RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google