Motherboard

A motherboard includes a circuit board, a plurality of electronic components, a metal cover and a flexible heat-conducting component. The electronic components are disposed at the circuit board. The metal cover covers the circuit board. The flexible heat-conducting component is disposed between the circuit board and the metal cover and contacts the electronic components and the metal cover.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan application serial no. 100112227, filed on Apr. 8, 2011. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a motherboard and, more particularly, to a motherboard with a cover.

2. Description of the Related Art

As computer technology develops rapidly, operation speed of the computer is greatly improved, and thus heating power of electronic components in the computer host increases. In order to prevent the electronic components from temporary or permanent failure due to overheating, the electronic components need sufficient heat dissipating efficiency.

A motherboard may be placed at a working place directly instead of accommodated in a computer casing to get better heat dissipating efficiency. However, if the electronic components at the motherboard are not shielded by the casing, they are easily affected by electromagnetic interference (EMI).

BRIEF SUMMARY OF THE INVENTION

A motherboard with good EMI shielding effect and high heat dissipating efficiency is disclosed.

A motherboard disclosed herein includes a circuit board, a plurality of electronic components, a metal cover and a flexible heat-conducting component. The electronic components are disposed at the circuit board. The metal cover covers the circuit board. The flexible heat-conducting component is disposed between the circuit board and the metal cover and contacts the electronic components and the metal cover.

DETAILED DESCRIPTION OF THE EMBODIMENTS

FIG. 1is an exploded diagram showing a motherboard in a first embodiment.FIG. 2is a schematic diagram showing the assembled motherboard inFIG. 1.FIG. 3is a sectional schematic diagram showing the motherboard inFIG. 2. A motherboard100includes a circuit board110, a plurality of electronic components120, a metal cover130and a flexible heat-conducting component140. The electronic components120are disposed at the circuit board110, and the metal cover130covers the circuit board110. The flexible heat-conducting component140is disposed between the circuit board110and the metal cover130and contacts the electronic components120and the metal cover130. The number of the electronic components120is not limited herein. The electronic components120may be, but not limited to, a south bridge chip, a north bridge chip, a network chip, a graphic processing unit (GPU), a sound chip, a capacitor or a resistance.

The metal cover130covers the circuit board110and shields the electronic components120at the circuit board110to improve the EMI shielding effect of the motherboard100. Moreover, since the flexible heat-conducting component140is flexible and can be shaped in varies outlooks, therefore, it is suitable to wrap the electronic components120and contact with the metal cover130closely. The flexible heat-conducting component140absorbs heat from the electronic components120rapidly and conducts the heat to the metal cover130evenly; therefore, the heat dissipating efficiency is improved. Moreover, since the metal cover130covers the circuit board110, the strip line effect is generated to improve the signal transmission quality of the circuit board110.

InFIG. 3, the flexible heat-conducting component140includes a flexible bag142within heat conducting material144. The heat conducting material144such as sulfate is placed inside the flexible bag142. When the temperature of the sulfate increases to a specific temperature (such as 30° C. to 40° C.), it converts from solid state to liquid state. Thus, in the process to assemble the circuit board110, the metal cover130and the flexible heat-conducting component140, the flexible heat-conducting component140can be heated to a specific temperature to convert the heat conducting material144therein from solid state to liquid state, and then the flexible heat-conducting component140is pressed by the metal cover130to cover the electronic components120at the circuit board110and contact with the metal cover130closely. The heat conducting material144is not limited herein, and it also may be other material which has the characteristics to convert from solid state to liquid state based on the change of the temperature.

As shown inFIG. 1andFIG. 2, the motherboard100further includes a plurality of connectors150disposed on the circuit board110. The metal cover130includes multiple openings132, and the shape and size of the openings132correspond to that of the connectors150, respectively. The orthographic projection of the flexible heat-conducting component140on the metal cover130does not overlap with that of the openings132, thus to expose the connectors150for the users to insert peripheral components to the motherboard100, such as expansion cards or memories. In other words, the flexible heat-conducting component140may include a plurality of openings to expose the connectors150, as shown inFIG. 1.

The number of the connectors150is not limited herein. Furthermore, a central processing unit (CPU) and a memory module may be selectively disposed at the motherboard100. The connectors150may include CPU connectors, memory connectors, data line connectors (for connecting a hard disk, an optical disk drive or other memory devices), power line connectors and universal serial bus (USB) connectors, which is not limited herein.

FIG. 4is a sectional schematic diagram showing a flexible heat-conducting component in another embodiment. In the embodiment, the flexible bag242is divided into multiple accommodating spaces240a, and the heat conducting material244is placed in the accommodating spaces240a. Thus, it can avoid that the heat conducting material244accumulates in a partial area of the flexible bag242which leads to low heat conducting efficiency of the flexible heat-conducting component240.

FIG. 5is a sectional schematic diagram showing a motherboard in a second embodiment. The circuit board310includes a ground pad312, and the metal cover330is electrically connected to the ground pad312to improve the EMI shielding effect. In detail, a metal spacer360is further disposed on the motherboard300between the metal cover330and the ground pad312, thus to electrically connect the metal cover330to the ground pad312via the metal spacer360. Additionally, the motherboard300further includes a fastener370. The fastener370is screwed to a screw cap380to fasten the metal cover330to the circuit board310.

FIG. 6is a schematic diagram showing that a fastener inFIG. 5is screwed to a device casing. The fastener370can not only be screwed to the screw cap380as shown inFIG. 5, it also can be screwed to a device casing50as shown inFIG. 6to fasten the motherboard300to the device casing50. The metal cover330may be connected to the device casing50via the fastener370for grounding to further improve the EMI shielding effect.

FIG. 7is a schematic diagram showing a motherboard in a third embodiment.FIG. 8is a schematic diagram showing a screw bolt inFIG. 7.FIG. 9is a schematic diagram showing a screw cap inFIG. 7. The motherboard400includes a screw cap480and a screw bolt490. The screw bolt490is fixed at the circuit board410; the metal cover430includes a whole432, and the screw bolt490passes through the whole432. The screw cap480is screwed to the screw bolt490and limits the metal cover430to the circuit board410.

Furthermore, the screw bolt490passes through the circuit board410and includes a through whole492. The motherboard400further includes a fastener470. The fastener470contacts the screw cap480, passes through the through hole492and is screwed to the device casing60to make the metal cover430connected to the device casing60for grounding, so as to further improve the EMI shielding effect.

In sum, according to the motherboard disclosed above, the metal cover covers the circuit board and shields the electronic components at the circuit board to improve the EMI shielding effect of the motherboard. Moreover, since the flexible heat-conducting component is flexible, it can cover the electronic components completely and contact the metal cover closely. The flexible heat-conducting component absorbs heat from the electronic components rapidly and conducts the heat to the metal cover evenly, and thus the heat dissipating efficiency is improved. Furthermore, the heat conducting material can be placed separately in multiple accommodating spaces of the flexible bag to avoid that the heat conducting material accumulates in a partial area of the flexible bag to reduce the heat conducting efficiency of the flexible heat-conducting component. Additionally, the metal cover can be connected to the circuit board or the device casing for grounding to further improve the EMI shielding effect.