The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2001
Filed:
Aug. 30, 1999
Vernon Bollesen, Milpitas, CA (US);
Sun Microsystems, Inc., Palo Alto, CA (US);
Abstract
A heat sink assembly includes a heat sink, a circuit board and an integrated circuit package. The heat sink includes torque bars having locking features. The package is located between the heat sink and the circuit board and attached to a die attach area of the circuit board. A heat sink retainer has ends secured in the locking features of the torque bars. Tension in the retainer imparts torque on the heat sink which causes the heat sink to impart a downward force on the package. The retainer presses the heat sink down uniformly on the package. Further, the downward force applied by the heat sink to the package is countered by an equal upward force applied by a base section of the retainer on the circuit board. Since the base section is located directly opposite the die attach area, the upward force is transferred from the base section directly back to the heat sink without imparting any bending force on the circuit board.