Patent Publication Number: US-2009219691-A1

Title: Heat sink capable of internal deflection

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates generally to heat sinks, and more particularly, to a heat sink capable of internal deflection. 
     2. Description of the Related Art 
     General electronic components generate high heat in operation and if the temperature of the electronic components is too high, the electronic product having the overheated electronic components will fail to function normally. Thus, the general electronic product is provided with a heat sink for keeping the electronic components working in stable operating temperature. 
     A general heat sink includes a bottom plate, a fin set mounted to the bottom plate, and a cooling fan mounted to the fin set. The bottom plate is mounted to an electronic component in need of thermal dissipation, such that the heat generated from the electronic component can be transferred to the bottom plate and the fin set. When the cooling fan is operated, the airstream is generated to take the heat away from the fin set, thus thermally dissipating the electronic component. 
     However, the efficiency of thermal dissipation is required higher and higher and thus the above-mentioned heat sink becomes relatively larger and larger. When the heat sink is mounted to the electronic component in need of thermal dissipation, the heat sink structurally interferes the thermal dissipation of other electronic components located around this one and the heat sink, such that the whole heat-dissipating area becomes smaller and the efficiency of the thermal dissipation becomes lower. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide a heat sink capable of internal inflection, which produces relatively larger area of thermal dissipation to have relatively higher heat-dissipating efficiency on the whole. 
     The foregoing objective of the present invention is attained by the heat sink, which is composed of a heat-dissipating member and a cooling fan. The heat-dissipating member includes at least two spaced fins. Each of the two fins has a first side, a second side, and a deflection piece mounted to a surface thereof. Each of the deflection pieces is inclined, extending from the first side toward the second side and engaging the adjacent fin. The cooling fan is mounted to the heat-dissipating member and close to the first sides of the fins. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded view of a preferred embodiment of the present invention. 
         FIG. 2  is an elevation view of the preferred embodiment of the present invention. 
         FIG. 3  is a right view of the preferred embodiment of the present invention. 
         FIG. 4  is a left view of the preferred embodiment of the present invention. 
         FIG. 5  is a rear view of the preferred embodiment of the present invention. 
         FIG. 6  is a side view of a part of the preferred embodiment of the present invention, illustrating the structure of the fins. 
         FIG. 7  is a rear view of a part of the preferred embodiment of the present invention, illustrating the structure of the fins. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Referring to  FIGS. 1-5 , a heat sink capable of internal deflection constructed in accordance with a preferred embodiment of the present invention is composed of a bottom plate  10 , a heat-dissipating member  20 , and a cooling fan  30 . Each of the bottom plate  10  and the heat-dissipating member  20  is made of heat-conductive material. The heat-dissipating member  20  includes a plurality of fins  22  parallel spaced from one another. The heat-dissipating member  20  is mounted to the bottom plate  10  via a strut  12 . 
     Referring to  FIGS. 6 and 7 , each of the fins  22  includes a first side  24 , a second side  26  opposite to the first side  24 , and a deflection piece  28  mounted vertically to a surface thereof. Each of the deflection pieces  28  is inclined, extending downward from the first side  24  toward the second side  26 . Each of the deflection pieces  28  engages a surface of the adjacent fin  22  to define, between each two adjacent fins, an upper space  40  and a lower space  42 . 
     The cooling fan  30  is mounted to the strut  12  and abuts the first sides  24  of the fins  22 , for generating and driving the airstream to pass through the fins  22  and to exit from the second sides  26 . The heat-dissipating member  20  further includes three heat pipes  44 . Each of the heat pipes  44  has two penetrative sections  46  and an intermediate section  48  located between the two penetrative sections  46 . In each of the heat pipes  44 , one of the two penetrative sections  46  runs through the fins  22 , the other runs through the bottom plate  10 , and the intermediate section  48  is located outside the fins  20 . In light of this, the heat pipes  44  can increase the efficiency of thermal dissipation of the heat sink on the whole. 
     When the heat sink of the present invention is mounted to an electronic component for thermal dissipation, the cooling fan  30  is operated to generate airstream and then the airstream flows into what is between each two adjacent fins  22 , flowing inside the upper spaces  40  and the lower spaces  42 . The air stream flowing through the upper spaces  40  flows parallel out of the heat-dissipating member  20  to exhaust the high heat generated by the electronic component in operation. The airstream flowing through the lower spaces  42  is interfered by the inflection pieces  28  to flow toward lower sides of the fins  22 . In this way, the airstream not only dissipates the heat of the electronic component but also flows toward other electronic components around the heat sink to also take the heat generated by those electronic components in operation to the external environment for thermal dissipation. 
     Therefore, the present invention can enlarge the area of thermal dissipation and increase the efficiency of thermal dissipation on the whole. 
     Although the present invention has been described with respect to a specific preferred embodiment thereof, it is no way limited to the details of the illustrated structures but changes and modifications may be made within the scope of the appended claims.