Heat sink

Abstract

A heat sink able to fundamentally suppress unpleasant sound by paying attention to the cause of generation of the unpleasant sound, that is, a heat sink provided with a heat spreader and a plurality of flat plate shaped fins provided on that and aligned in parallel, wherein a tone noise diffusing function unit is added or a tone noise diffusion structure is introduced. By using this function unit or structure, tone noise of substantially a single frequency which forms the basis of the unpleasant sound generated from the plurality of flat plate shaped fins by the cooling air is diffused to tone noise having a plurality of frequencies and the unpleasant sound is reduced.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above object and features of the present invention will be more apparent from the following description of the preferred embodiments given with reference to the attached drawings, wherein:

FIG. 1 is a first side view of a heat sink according to a first embodiment according to the present invention;

FIG. 2 is a plan view of a heat sink according to a first embodiment according to the present invention;

FIG. 3 is a second side view of a heat sink according to a first embodiment according to the present invention;

FIG. 4 is a side view of a heat sink according to a second embodiment according to the present invention;

FIG. 5 is a plan view of a heat sink according to a second embodiment according to the present invention;

FIG. 6 is a side view of a heat sink according to a third embodiment according to the present invention;

FIG. 7 is a plan view of a heat sink according to a third embodiment according to the present invention;

FIG. 8 is a side view of a heat sink according to a modification of the third embodiment according to the present invention;

FIG. 9 is a plan view of a heat sink according to a modification of the third embodiment according to the present invention;

FIG. 10 is a front view of a heat sink according to a fourth embodiment according to the present invention;

FIG. 11 is a side view of a heat sink according to a fourth embodiment according to the present invention;

FIG. 12 is a plan view of a heat sink according to a fourth embodiment according to the present invention;

FIG. 13 is a side view of a heat sink according to a fifth embodiment according to the present invention;

FIG. 14 is a side view showing another example of a heat sink according to the fifth embodiment of FIG. 13;

FIG. 15 is a side view of a heat sink according to a modification of the fifth embodiment according to the present invention;

FIG. 16 is a graph showing a tone noise characteristic when using a conventional heat sink;

FIG. 17 is a graph showing the tone noise characteristic when using a heat sink of a first embodiment according to the present invention;

FIG. 18 is a graph showing the tone noise characteristic when using a heat sink of a fourth embodiment according to the present invention;

FIG. 19 is a front view of a conventional heat sink;

FIG. 20 is a side view of a conventional heat sink; and

FIG. 21 is a plan view of a conventional heat sink.

Claims

1. A heat sink provided with a heat spreader and a plurality of flat plate shaped fins provided on the heat spreader and aligned in parallel adjacent to each other, wherein a tone noise diffusing function unit is formed for diffusing tone noise of a substantially single frequency generated from said plurality of flat plate shaped fins by cooling air to tone noise having a plurality of frequencies,the tone noise diffusing function unit comprised of tone noise diffusing plates inserted and fixed into spaces between adjacent fins of a plurality of flat plate shaped fins.

2. A heat sink as set forth in claim 1, wherein said plurality of tone noise diffusing plates are randomly arranged in a width direction of the tone noise diffusing plates when seen from top surfaces of said plurality of flat plate shaped fins.

3. A heat sink as set forth in claim 1, wherein said plurality of tone noise diffusing plates are arranged randomly in a height direction of the tone noise diffusing plates when seen from side surfaces of the plurality of flat plate shaped fins.

4. A heat sink as set forth in claim 1, wherein said tone noise diffusing plates are rectangularly shaped and are made by a metal such as aluminum, copper, or iron or a plastic.

5. A heat sink provided with a heat spreader and a plurality of flat plate shaped fins provided on the heat spreader and aligned in parallel adjacent to each other, wherein a tone noise diffusing function unit is formed for diffusing tone noise of a substantially single frequency generated from said plurality of flat plate shaped fins by cooling air to tone noise having a plurality of frequencies,the tone noise diffusing function unit comprised of a plurality of tone noise diffusing tapes laid on top surfaces of said plurality of flat plate shaped fins and in directions intersecting with free ends of the plurality of flat plate shaped fins.

6. A heat sink as set forth in claim 5, wherein said tone noise diffusing tapes are constituted by metallic tapes or heat conduction tapes provided with tackiness.

7. A heat sink provided with a heat spreader and a plurality of flat plate shaped fins provided on the heat spreader and aligned in parallel adjacent to each other, wherein a tone noise diffusing function unit is formed for diffusing tone noise of a substantially single frequency generated from said plurality of flat plate shaped fins by cooling air to tone noise having a plurality of frequencies,the tone noise diffusing function unit comprised of wires laid between said plurality of flat plate shaped fins at random locations along the flat plate shaped fins in the height direction of the flat plate shaped fins.

8. A heat sink provided with a heat spreader and a plurality of flat plate shaped fins provided on the heat spreader and aligned in parallel adjacent to each other, wherein a tone noise diffusing function unit is formed for diffusing tone noise of a substantially single frequency generated from said plurality of flat plate shaped fins by cooling air to tone noise having a plurality of frequencies,the tone noise diffusing function unit comprised of a plurality of wires laid so as to laterally pass through said plurality of flat plate shaped fins in directions random relative to each other.

9. A heat sink as set forth in claim 7, wherein said wires are comprised of metallic wires or threads.

10. A heat sink provided with a heat spreader, a plurality of flat plate shaped fins provided on the heat spreader and aligned in parallel adjacent to each other, and at least one heat pipe laid so as to pass through the flat plate shaped fins in order to radiate the heat on said heat spreader from the flat plate shaped fins, wherein a tone noise diffusing function unit is formed for diffusing tone noise having a substantially single frequency generated from said plurality of flat plate shaped fins by the cooling air to tone noise having a plurality of frequencies,the tone noise diffusing function unit comprised of tone noise diffusing strips having first ends bonded to said heat pipe and inserted and fixed between adjoining fins of said plurality of flat plate shaped fins.

11. A heat sink as set forth in claim 10, wherein said tone noise diffusing strips are arranged in a direction along the flow of said cooling air.

12. A heat sink provided with a heat spreader and a plurality of flat plate shaped fins provided on the heat spreader and aligned in parallel adjacent to each other, wherein the overall structure of said plurality of flat plate shaped fins is made a tone noise diffusing structure diffusing tone noise having substantially a single frequency generated from said flat plate shaped fins by cooling air to tone noise having a plurality of frequencies,the tone noise diffusing structure comprised of a structure that makes alignment pitches between adjacent flat plate shaped fins non-uniform relative to each other.

13. A heat sink as set forth in claim 12, wherein said alignment pitches are made denser/sparser in accordance with a level of temperature distribution on said heat spreader.

14. A heat sink provided with a heat spreader and a plurality of flat plate shaped fins provided on the heat spreader and aligned in parallel adjacent to each other, wherein the overall structure of said plurality of flat plate shaped fins is made a tone noise diffusing structure diffusing tone noise having substantially a single frequency generated from said flat plate shaped fins by cooling air to tone noise having a plurality of frequencies,the tone noise diffusing structure comprised of a structure that changes heights of the flat plate shaped fins randomly so that top surfaces of the flat plate shaped fins do not become flat.

15. A heat sink as set forth in claim 8, wherein said wires are comprised of metallic wires or threads.