Heat dissipation structure for mobile device

A heat dissipation structure for mobile device includes an element holding member, which has a holding portion and a cooling chip set on the holding portion. The holding portion has a first side and an opposite second side; and the cooling chip has a cold surface and an opposite hot surface. The cooling chip is set on the holding portion with the cold surface and the hot surface being flush with the first and the second side of the holding portion, respectively. The heat dissipation structure can be mounted in a mobile device to quickly cool heat-producing electronic elements in the mobile device, so that any produced heat is guided away from the mobile device without accumulating therein.

FIELD OF THE INVENTION

The present invention relates to a heat dissipation structure for mobile device, and more particularly to a mobile device's heat dissipation structure that includes a cooling module for cooling an interior of the mobile device and enables enhanced heat dissipation efficiency of the mobile device.

BACKGROUND OF THE INVENTION

Most of the currently available mobile devices, such as notebook computers, tablet computers and smartphones, have a slim body and a largely increased computing speed. The electronic elements in the mobile devices for executing the computation at high speed also produce a large amount of heat during operation thereof. For the purpose of being conveniently portable, the mobile devices have a largely reduced overall thickness. And, to prevent invasion by foreign matters and moisture, the mobile devices are provided with only an earphone port and some necessary connection ports but not other open holes that allow air convection between the narrow internal space of the mobile devices and the external environment. Therefore, due to the small thickness of the mobile devices, the large amount of heat produced by the electronic elements in the mobile devices, such as the computation executing units and the battery, can not be quickly dissipated into the external environment. Further, due to the closed narrow internal space of the mobile devices, it is difficult for the heat produced by the electronic elements to dissipate through air convection. As a result, heat tends to accumulate or gather in the mobile devices to adversely affect the working efficiency or even cause crash of the mobile devices.

To solve the above problems, some passive type heat dissipation elements, such as heat spreader, vapor chamber, heat sink, etc., are mounted in the mobile devices to assist in heat dissipation thereof. Due to the small thickness and the narrow internal space of the mobile devices, these passive type heat dissipation elements must also be extremely thin to be mounted in the very limited internal space of the mobile devices. However, the wick structure and the vapor passage in the size reduced heat spreader and vapor chamber are also reduced in size to result in largely lowered heat transfer efficiency of the heat spreader and the vapor chamber and accordingly, poor heat dissipation performance thereof. In brief, when the internal computing units of the mobile devices have an extremely high power, the conventional heat spreader and vapor chambers just could not effectively dissipate the heat produced by the high power computing units.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide a heat dissipation structure for mobile device to overcome the drawbacks of the prior art. To achieve the above and other objects, the heat dissipation structure for mobile device according to the present invention includes an element holding member.

The element holding member includes a holding portion and a cooling chip set on the holding portion. The holding portion has a first side and an opposite second side, and the cooling chip has a cold surface and an opposite hot surface. The cooling chip is set on the holding portion with the cold surface and the hot surface being flush with the first side and the second side of the holding portion, respectively.

The heat dissipation structure of the present invention can be mounted in a mobile device to quickly cool heat-producing electronic elements in the mobile device, preventing any produced heat from accumulating in the mobile device to thereby give the latter to an upgraded overall heat dissipation performance.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be described with some preferred embodiments thereof and by referring to the accompanying drawings. For the purpose of easy to understand, elements that are the same in the preferred embodiments are denoted by the same reference numerals.

Please refer toFIGS. 1 and 2that are exploded perspective and assembled sectional views, respectively, of a heat dissipation structure for mobile device according to a first embodiment of the present invention. As shown, the heat dissipation structure for mobile device includes an element holding member1.

The element holding member1includes a holding portion11and a cooling chip12set on the holding portion11. The holding portion11has a first side111and an opposite second side112. The cooling chip12has a cold surface121and an opposite hot surface122. The cooling chip12is set on the holding portion11with the cold surface121and the hot surface122being flush with the first side111and the second side112, respectively.

The element holding member1further includes a receiving space13, which has an open side131and an opposite closed side132. The holding portion11is provided on the closed side132of the receiving space13of the element holding member1. The closed side132of the receiving space13is formed with a through hole133, in which the cooling chip12is set, such that the cold surface121and the hot surface122of the cooling chip12are flush with the first side111and the second112of the holding portion11, respectively.

The element holding member1can be formed of an aluminum sheet, an aluminum copper alloy sheet, a stainless steel sheet, a sheet molded by way of powder metallurgy, or a sheet molded by way of plastic injection molding.

FIGS. 3 and 4are exploded perspective and assembled sectional views, respectively, of a heat dissipation structure for mobile device according to a second embodiment of the present invention. As shown, the second embodiment is generally structurally similar to the first embodiment, except that there are a plurality of electronic elements2held to the first side111of the holding portion11and at least one heat dissipation element3held to the second side112of the holding portion11. The electronic elements2include at least one heat source21, which is attached to or located adjacent to the cold surface121of the cooling chip12. The electronic elements2can be any of a circuit board, a transistor, a flash memory or a central processing unit (CPU). By attaching the heat source21to the cold surface121of the cooling chip12, the cold surface121of the cooling chip12functions to cooling the heat source21of the electronic elements2.

The heat dissipation element3held to the second side112of the holding portion11can be a copper thin sheet, a vapor chamber, a heat pipe, or a piece of graphite or graphene. The heat dissipation element3is attached to the hot surface122of the cooling chip12to be flush with the second side112of the holding portion11. Heat produced by the hot surface122of the cooling chip12can be transferred via the heat dissipation element3to other areas of the element holding member1for the heat to uniformly dissipate from the element holding member into ambient air.

FIG. 5is an assembled sectional view of a heat dissipation structure for mobile device according to a third embodiment of the present invention. As shown, the third embodiment is generally structurally similar to the second embodiment, except that, in the third embodiment, the hot surface of the cooling chip12has a heat dissipation layer123formed thereon. With the heat dissipation layer123, the heat dissipation structure for mobile device according to the present invention can have further increased heat dissipation efficiency through heat radiation.

The heat dissipation layer123is formed on the hot surface of the cooling chip12through micro arc oxidation (MAO) process, plasma electrolytic oxidation (PEO) process, anodic spark deposition (ASD) process, or anodic oxidation by spark deposition (ANOF) process.

The heat dissipation layer123is a porous structure, a nanostructure, a high-radiation ceramic structure or a high-rigidity ceramic structure, and preferably has a black color, a matt black color, or any dark color.