Patent ID: 12200911

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be described with a preferred embodiment thereof.

Please refer toFIG.2, which is an exploded perspective view of a structure for evenly applying forces on a heat dissipation base plate according to an embodiment of the present invention; and toFIGS.3aand3b, which are assembled perspective and sectional views, respectively, ofFIG.2. For the purpose of conciseness and clarity, the structure for evenly applying forces on a heat dissipation base plate of the present invention is also briefly referred to as “the Structure” herein. As shown, the Structure includes a heat dissipation base plate5, a hold-down member6, and an adjustment element7.

The heat dissipation base plate5has an upper surface51and a lower surface52located on a top and a bottom side of the heat dissipation base plate5, respectively. The heat dissipation base plate5is formed with at least one through bore53and a first threaded hole54. The first threaded hole54is provided on the upper surface51, it can be a hole extending through the heat dissipation base plate5or a blind hole. In the illustrated embodiment, there is one through bore53provided at each of four corners of the heat dissipation base plate5to extend from the upper surface51to the lower surface52. The heat dissipation base plate5is fixedly held in place on a heat source10by threading a screw fastening element8through each of the through bores53, such that the lower surface52is in contact with the heat source10. Alternatively, the heat dissipation base plate5is fixedly connected to a target unit, such as a fixing seat, a circuit substrate, or a heat transfer element, by the screw fastening elements8. In the illustrated embodiment, the heat dissipation base plate5is fixed to a fixing seat9by the screw fastening elements8. However, it is understood the present invention is not particularly limited thereto.

The hold-down member6has an upper side6aand a lower side6b, and is disposed on a central area of the upper surface51of the heat dissipation base plate5with the lower side6bin contact with the upper surface51. A second threaded hole61is formed on the hold-down member6to extend from the upper side6ato the lower side6b. The hold-down member6can be a plate, a sheet, a strip or a frame in a rectangular shape, a cross shape, an X shape, a star shape, a letter-n shape, or a hollow square shape. In the illustrated embodiment, the hold-down member6is in a rectangular shape. However, it is understood the illustrated embodiment is non-restrictive. The hold-down member6applies evenly distributed downward forces on the entire heat dissipation base plate5, such that not only the four corners but also the central area of the heat dissipation base plate5are subjected to the downward forces.

The adjustment element7includes a screw bolt71having a free end and an opposite end, and a turning knob72connected to the opposite end of the screw bolt71. In the illustrated embodiment, the turning knob72is in the form of a crosspiece perpendicularly connected to the opposite end of the screw bolt71to give the adjustment element7a T-shaped configuration. The screw bolt71is externally threaded, and its free end is sized for correspondingly threading through the first and second threaded holes54,61. The turning knob72can be turned to rotate the screw bolt71clockwise or counterclockwise, so that the free end of the screw bolt71is screwed into the first and second threaded holes54,61to force the hold-down member6to tightly and fitly contact with the heat dissipation base plate5. With the downward force applied by the hold-down member6to the central area of the heat dissipation base plate5, the latter can be in tight contact with the heat source10without any clearance between them to thereby enable upgraded heat transfer performance. The adjustment element7also enables fine adjustment of a bonding strength between the hold-down member6and the heat dissipation base plate5. In other words, the hold-down member6provides the heat dissipation base plate5with evenly distributed downward forces toward the heat source10. In the case the heat source10is in the form of a bare die, the adjustment element7can be properly turned to finely adjust the downward forces applied by the hold-down member6to the heat dissipation base plate5and accordingly, protects the bare die from any breaking or damage on the surface thereof due to excessive downward pressure against the bare die.

The heat dissipation base plate5and the heat source10may otherwise have a receiving space existing between them for receiving at least one heat transfer element therein. The heat transfer element is superposed on the heat source10. The hold-down member6can apply evenly distributed downward forces on the heat dissipation base plate5for the heat transfer element to more tightly contact with the heat source10. The heat transfer element can be a heat pipe or a vapor chamber. In the illustrated embodiment, the heat transfer element may be a heat pipe. However, it is understood the present invention is not particularly limited thereto.

FIG.4is a three-dimensional thermogram of the heat dissipation base plate5in the present invention. Please refer toFIG.4along withFIGS.2,3aand3b. When the screw fastening elements8are quickly extended through the through bores53at the four corners of the heat dissipation base plate5, the latter is fixedly fastened to the fixing seat9, and there is not any image in the thermogram ofFIG.4showing it is affected by heat. Then, the adjustment element7is turned clockwise or counterclockwise to thread the screw bolt71into the first and second threaded holes54,61for the hold-down member6to slowly press against the central area of the heat dissipation base plate5and apply a downward hold-down force thereon. By doing this, the heat dissipation base plate5, which initially has only four corners fixed in place while the central area thereof is not in tight contact with the heat source10, now has evenly distributed downward forces applied to its central area by the hold-down member6. As a result, the heat dissipation base plate5and the heat source10do not have any clearance existed between them to enable upgraded heat transfer performance. The thermogram ofFIG.4shows that a generally uniform color is distributed over all locations, which means the heat source10is under evenly distributed forces from the heat dissipation base plate5and accordingly, heat from the heat source10is also evenly distributed in the thermogram.

The present invention is characterized in providing a structure for evenly applying forces on a heat dissipation base plate for the latter to fully tightly press against a heat source, so that heat can be evenly transferred from the heat source to the heat dissipation base plate while effectively overcome the problem of thermal resistance that occurs if the heat source and the heat dissipation base plate are not in full contact with one another. The Structure of the present invention is also characterized in providing an adjustment element for finely adjusting a bonding strength of the heat dissipation base plate to the heat source.

The present invention has been described with a preferred embodiment thereof and it is understood that many changes and modifications in the described embodiment can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.