Heat radiating fin

The present invention relates to a heat radiating fin, and more particularly to heat radiating fins that can be easily manufactured to have enhanced structural strength and be stably stacked to form a heat sink.

With the constantly developed technologies, many electronic elements in electronic apparatus and devices operate at an increasingly high speed and produce more heat than before. As a result, there is an urgent demand for an improved heat sink. A conventional heat sink usually includes a large number of stacked heat radiating fins to achieve an enhanced heat radiating and dissipating effect. Therefore, it has become an important task for the electronic industrial field to research and develop newer, more efficient, and cost-effective heat radiating fins.

FIG. 1 shows a conventional heat radiating fin 1 and FIG. 2 shows the assembling of a plurality of the heat radiating fins 1 into a heat sink. As shown, the heat radiating fin 1 is formed at two lateral sides with two corresponding bent edges 11, on each of which a receiving slot 111 and a retaining catch 112 are formed. The conventional heat radiating fin 1 is also formed on a flat body 12 thereof with at least one through hole 10, via which a heat pipe 2 may be extended to thereby associate with the heat radiating fin 1. When two or more heat radiating fins 1 are stacked to form a heat sink, the retaining catches 112 on the bent edges 11 of a first heat radiating fin 1 are engaged with the receiving slots 111 on the bent edges 11 of a second heat radiating fin 1 located before the first heat radiating fin 1, so that the stacked heat radiating fins 1 are connected to one another.

To fabricate the conventional heat radiating fin 1, first bend two lateral sides thereof to form the two bent edges 11, and then form the receiving slots 111 and retaining catches 112 on the bent edges 11 by stamping or other suitable ways. Therefore, the forming of the conventional heat radiating fin 1 involves in many complicated machining procedures, and the forming of the heat sink by assembling the heat radiating fins 1 takes a lot of time and labor. Moreover, the forming of the receiving slots 111 and the retaining catches 112 by stamping produces a large quantity of scraps and is subject to high bad yield to further increase the overall cost of the heat radiating fin 1.

When the conventional heat radiating fin 1 is dismounted from the assembled heat sink, the receiving slots 111 and the retaining catches 112 on the bent edges 11 will more or less become deformed due to the external pressure applied to the heat radiating fin 1 for dismounting it from the assembled heat sink. Therefore, when the heat radiating fin 1 dismounted from the assembled heat sink is remounted to the heat sink, it would usually fail to fitly and tightly engage with other heat radiating fins 1 as before, and tends to separate therefrom.

In brief, the conventional heat radiating fin 1 has the following disadvantages: (1) it requires extra time and labor to fabricate; (2) many complicated fabricating procedures are involved to increase the manufacturing cost; (3) a large quantity of scraps is produced; and (4) the receiving slots and the retaining catches are easily deformed under external force, preventing the dismounted heat radiating fin from being fitly and tightly remounted to the heat sink. It is therefore tried by the inventor to develop an improved heat radiating fin to overcome the drawbacks in the conventional heat radiating fin.

A primary object of the present invention is to provide a heat radiating fin that enables easy assembling of it to other ones to form a heat sink and may be dismounted from and remounted to the heat sink without deformation.

Another object of the present invention is to provide a heat radiating fin that can be fabricated with largely reduced material without producing a large quantity of scraps.

A further object of the present invention is to provide a heat radiating fin that can be quickly fabricated at decreased labor and time to lower the overall cost thereof.

To achieve the above and other objects, the heat radiating fin according to the present invention includes a flat body having a front side and a rear side, a plurality of protruded portions formed on the front side of the flat body by way of stretching or drawing to have a predetermined height, and a plurality of recessed portions correspondingly formed on the rear side of the flat body behind the protruded portions. The protruded portions on the flat body of a first heat radiating fin are partially extendable into corresponding recessed portions on the flat body of a second heat radiating fin located before the first one, allowing the first and the second heat radiating fin to be easily and stably stacked.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein

FIG. 1 is a perspective view of a conventional heat radiating fin;

FIG. 2 shows the assembling of a plurality of the conventional heat radiating fins of FIG. 1 into a heat sink;

FIG. 3 is a rear perspective view of a heat radiating fin according to a first embodiment of the present invention;

FIG. 4 is a front perspective view of the heat radiating fin of FIG. 3;

FIG. 5 is a perspective view showing the assembling of a plurality of the heat radiating fins of the present invention into a heat sink;

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