Heat dissipating assembly with thermal plates

A heat dissipating assembly for electronic components mounted on a circuit board includes a first thermal plate (10), a second thermal plate (30), and a copper adjusting screw (60). The first thermal plate forms a plurality of offset portions (12) and thereby defines a plurality of recesses at the offset portions respectively. Depths of the recesses correspond to heights of the electronic components. The first and second thermal plates are secured to opposite sides of the circuit board. The first and second thermal plates respectively define first and third holes (14, 32) movably receiving the adjusting screw therein. The adjusting screw is tightened so that it improves thermal contact between the offset portions and the electronic components. Because the adjusting screw is made of highly heat conductive material, heat in the first thermal plate is conducted to the second thermal plate through the adjusting screw.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a heat dissipating assembly for electronic components mounted on computer circuit boards, and particularly to a heat dissipating assembly having thermal plates.

2. Description of the Related Art

A computer circuit board typically has one or more heat-generating electronic devices fixed thereon. The circuit board is often installed in a cramped location inside a computer enclosure. In this environment, there is not enough space to install a conventional bulky heat sink onto any electronic device. Instead, a thermal plate can be attached onto a surface of the electronic device. The low profile of the thermal plate allows it to be accommodated in the limited space inside the computer enclosure.

When there is more than one heat-generating electronic device, a single thermal plate attached to all the electronic devices is most convenient. The electronic devices generally have varying heights. Therefore a configuration of the thermal plate must be tailored to the electronic devices of a particular application, in order to ensure that the thermal plate fits all the electronic devices well. This requires unduly high precision machining, and is time consuming and costly. In addition, a single thermal plate may not provide sufficient heat dissipation in certain applications; for example when the electronic devices generate copious amounts of heat, or when the overall configuration of the circuit board limits the coverage of the thermal plate. A second thermal plate may be attached to an opposite side of the circuit board, but establishing thermal connection between the electronic devices and the second thermal plate is problematic.

BRIEF SUMMARY OF THE INVENTION

Accordingly, an object of the present invention is to provide a heat dissipating assembly requiring relatively low precision machining.

To achieve the above object, a heat dissipating assembly in accordance with a preferred embodiment of the present invention for electronic components mounted on a circuit board comprises a first thermal plate, a second thermal plate, a copper adjusting screw and four fastening screws. The first thermal plate forms a plurality of offset portions and thereby defines a plurality of recesses at the offset portions respectively. Depths of the recesses correspond to heights of the electronic components. The first thermal plate and the second thermal plate respectively define four second holes and four fourth holes in respective corners thereof. The fastening screws are extended through the second and fourth holes, thereby securing the first and second thermal plates to opposite sides of the circuit board respectively. The first thermal plate and the second thermal plate respectively define a first hole and a third hole movably receiving the adjusting screw therein. The adjusting screw is tightened so that it improves thermal contact between the offset portions and the electronic components. Because the adjusting screw is made of highly heat conductive material, heat in the first thermal plate is conducted to the second thermal plate through the adjusting screw.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1 , a heat dissipating assembly in accordance with a preferred embodiment of the present invention comprises a first thermal plate 10 , a second thermal plate 30 , a copper adjusting screw 60 and four fastening screws 50 . The first and second thermal plates 10 , 30 are for attachment to a printed circuit board (PCB) 70 , to dissipate heat from heat-generating electronic components such as chipsets 76 that are mounted on the PCB 70 .

The first plate 10 is punched upwardly to form a plurality of offset portions 12 and thereby define a plurality of recesses (not labeled) at the offset portions respectively. Depths of the recesses correspond to heights of the chipsets 76 . A first hole 14 is defined in a central portion of the first plate 10 . Four second holes 16 are respectively defined in four corners of the first plate 10 .

The second plate 30 is generally flat. A third hole 32 is defined in a central portion of the second plate 30 . Four fourth holes 34 are respectively defined in four corners of the second plate 30 . The third hole 32 and the fourth holes 34 of the second plate 30 respectively correspond to the first hole 14 and the second holes 16 of the first plate 10 .

A fifth hole 74 is defined in a central portion of the PCB 70 . Four sixth holes 72 are respectively defined in four corners of the PCB 70 .

Referring to FIG. 2 , in assembly, the first plate 10 is placed on the PCB 70 over the chipsets 76 . The second plate 30 is placed under the PCB 70 . The four fastening screws 50 are sequentially inserted through the second holes 16 of the first plate 10 , the sixth holes 72 of the PCB 70 and the fourth holes 34 of the second plate 30 to securely fasten the first and second plates 10 , 30 to the PCB 70 .

Then the adjusting screw 60 is sequentially inserted through the first hole 14 of the first plate 10 , the fifth hole 74 of the PCB 70 and the third hole 32 of the second plate 30 . The adjusting screw 60 is tightened so that it improves thermal contact between the first plate 10 at the recesses 12 and the chipsets 76 on the PCB 70 .

Heat is conducted from the chipsets 76 to the first plate 10 , and dissipated from the first plate 10 . Because the adjusting screw 60 is made of highly heat conductive material, heat in the first plate 10 is also conducted to the second plate 30 through the adjusting screw 60 . Such heat is then dissipated from the second plate 30 .