Source: http://www.google.com/patents/US8097937?dq=5,579,517
Timestamp: 2015-03-03 04:55:37
Document Index: 780245992

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', 'Application No. 2002', 'Application No. 2002']

Patent US8097937 - Leadframe and housing for radiation-emitting component, radiation-emitting ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA 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/US8097937?utm_source=gb-gplus-sharePatent US8097937 - Leadframe and housing for radiation-emitting component, radiation-emitting component, and a method for producing the componentAdvanced Patent SearchPublication numberUS8097937 B2Publication typeGrantApplication numberUS 10/683,712Publication dateJan 17, 2012Filing dateOct 10, 2003Priority dateApr 10, 2001Also published asCN1602555A, CN100359702C, CN100539225C, CN101154703A, DE10117889A1, EP1378013A2, US20040075100, WO2002084749A2, WO2002084749A3Publication number10683712, 683712, US 8097937 B2, US 8097937B2, US-B2-8097937, US8097937 B2, US8097937B2InventorsGeorg Bogner, Herbert Brunner, Michael Hiegler, G�nter WaitlOriginal AssigneeOsram AgExport CitationBiBTeX, EndNote, RefManPatent Citations (55), Non-Patent Citations (4), Classifications (23), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetLeadframe and housing for radiation-emitting component, radiation-emitting component, and a method for producing the component
US 8097937 B2Abstract
9. The radiation-emitting component according to claim 8, wherein said silver solder has a melting temperature greater than 260� C.
V≦q�H is satisfied. In such a case, q denotes a scaling factor, whose value is less than 10 mm2 and is, preferably, 7 mm2.
In accordance with a further feature of the invention, the chip is mounted on the chip mounting area by a silver solder, in particular, a silver solder having a melting temperature greater than 260� C.
Mounting the chip on the leadframe before it is extrusion-coated allows the chip to be fitted, in particular, at temperatures above 260� C. by a silver-soldering method. This results in a particularly low thermal resistance between the chip and the leadframe. Furthermore, this results in a highly temperature-resistant connection between the chip and the thermal connecting part and, in particular, reduces the risk of detachment of the chip when the component is soldered in at typical temperatures of up to about 260� C.
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. 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.
V≦q�H 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.
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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