Patent Publication Number: US-8125125-B2

Title: Light source module

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan application serial no. 98133262, filed on Sep. 30, 2009. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a light source module, and more particularly to a light source module with a light emitting diode package used as a light emitting device. 
     2. Description of Related Art 
     With progress in semiconductor technologies, current light emitting diode (LED) can emit lights with high luminance and has the advantages of low power consumption, compactness, low driving voltage, and so forth. Therefore, the LED has been widely applied in the field of illumination. 
     Typically, when the LED emits lights with high luminance, it generates high thermal energy. If the thermal energy cannot be transmitted away and keeps on accumulating within the LED, the temperature of the LED is continuously increased. Therefore, the over heated LED leads to the luminance of the LED fading away and the decreasing of the lifetime of the LED and even the permanent damage of the LED. Hence, the current illumination using the LED is equipped with the heat sink to dissipate the heat generated by the LED. 
     However, in the conventional LED light source module, the LED is disposed on the circuit board and the circuit board having the LED thereon is disposed on the heat sink. The heat conducted onto the heat sink from the LED is conducted away through the air current generated by the fan. Nevertheless, the circuit board usually has the insulating layers thereon to insulate the wire layers from each other, and the insulating layers are poor thermal conductors. Therefore, the thermal conducting rate of conducting the heat of the LED to the heat sink through the circuit board is seriously affected and the heat dissipation efficiency of the LED light source module is poor. 
     SUMMARY OF THE INVENTION 
     The present invention provides a light source module having a relatively better heat dissipation efficiency. 
     One embodiment of the present invention provides a light source module including a heat dissipation block, a light emitting diode package and a circuit board. The heat dissipation block has a surface and the light emitting diode package is disposed on the surface of the heat dissipation block. The circuit board is electrically connect to the light emitting diode package, and the circuit board and the light emitting diode package are disposed at two opposite sides of the heat dissipation block respectively. 
     In one embodiment of the present invention, the light source module further comprises at least a conductive device electrically connected to the light emitting diode package and the circuit board. 
     In one embodiment of the present invention, the heat dissipation block has a recess for disposing the light emitting diode package therein, and the conductive device penetrates through the heat dissipation block, and the light emitting diode package is electrically connected to one end of the conductive device. 
     In one embodiment of the present invention, the light source module further comprises at least an insulating ring circling the conductive device and electrically insulating the conductive device from the heat dissipation block. 
     In one embodiment of the present invention, the conductive device is a conductive pillar. One end of the conductive pillar away from the light emitting diode package protrudes from the insulating ring and has a protruding edge, and a radius of an outer periphery of the protruding edge is larger than a radius of an inner periphery of the insulating ring. 
     In one embodiment of the present invention, the light source module further comprises at least a conductive line, and one end of the conductive line winds between the insulating ring and the protruding edge, and the other end of the conductive line is connected to the circuit board. 
     In one embodiment of the present invention, the heat dissipation block has a solder point. The light emitting diode package is configured on the heat dissipation block by being soldered on the solder point. 
     In one embodiment of the present invention, the light source module further comprises a lamp cup, wherein the heat dissipation block is configured on the lamp cup, and a fan is configured between the heat dissipation block and the lamp cup, and the circuit board is configured in the lamp cup. 
     In one embodiment of the present invention, the light source module further comprises a connector electrically connected to the circuit board and fixed on the lamp cup. 
     In one embodiment of the present invention further provides a light source module including a heat dissipation block, a light emitting diode package and a fan module. The heat dissipation block has a surface and the light emitting diode package is disposed on the surface of the heat dissipation block. The fan module and the light emitting diode package are disposed at two opposite sides of the heat dissipation block respectively. The fan module has an opening, a blade and a baffle plate circling the opening. The blade is disposed in the opening for generating an air current. The air current in the opening flows along a flowing direction to dissipate the heat of the heat dissipation block. The baffle plate prevents the air current from flowing along a direction opposite to the flowing direction. 
     In one embodiment of the present invention, the light source module further comprises a circuit board electrically connected to the light emitting diode package, wherein the circuit board and the heat dissipation block are disposed at two opposite sides of the fan module respectively. 
     In one embodiment of the present invention, the light source module further comprises a connector electrically connected to the circuit board. 
     In one embodiment of the present invention, the light source module further comprises a lamp cup, wherein the fan module and the heat dissipation block are configured on the lamp cup, and the heat dissipation block is configured on the fan module. 
     Accordingly, in the light source module of the embodiment of the present invention, since the light emitting diode package is configured on the surface of the heat dissipation block, the heat generated by the light emitting diode package can be directly conducted to the heat dissipation block without being blocked by the circuit board. Therefore, the light source module of the embodiment of the present invention possesses a relatively better heat dissipation efficiency. Moreover, in the light source module of the embodiment of the present invention, because the fan module has the baffle plate to prevent the air current from flowing along a direction opposite to the flow direction of the air current in the opening and to further improve the heat convection, the light source module possesses a relatively better heat dissipation efficiency. 
     In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanying figures are described in detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1  is a schematic view of a light source module according to one embodiment of the present invention. 
         FIG. 2  is an exploded view of the light source module in  FIG. 1 . 
         FIG. 3  is a schematic enlarged view showing the conductive device of  FIG. 1  equipped with the light emitting diode package. 
         FIG. 4  is a schematic view of the lamp cup in the light source module of  FIG. 1  before the lamp cup is assembled. 
         FIG. 5  is a schematic view of the lamp cup in the light source module of  FIG. 1  after the lamp cup is assembled. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
       FIG. 1  is a schematic view of a light source module according to one embodiment of the present invention.  FIG. 2  is an exploded view of the light source module in  FIG. 1 . As shown in  FIG. 1  and  FIG. 2 , a light source module  100  of the present embodiment includes a heat dissipation block  110  and a light emitting diode package  120 . The heat dissipation block  110  has a surface  112  and the light emitting diode package  120  is disposed on the surface  112  of the heat dissipation block  110 . In the present embodiment, the light source module  100  further comprises a circuit board  130  electrically connected to the light emitting diode package  120  and a fan module  140 . The light emitting diode package  120  and the circuit board  130  are disposed on two opposite sides of the heat dissipation block  110  respectively and the fan module  140  is disposed between the heat dissipation block  110  and the circuit board  130 . 
     More specifically, the fan module  140  has an opening  142  and a blade  144  disposed in the opening  142 . The blade  144  is adapted to generating an air current. The air current in the opening  142  flows along a flowing direction A 1  to dissipate the heat of the heat dissipation block  110 . Hence, the heat generated by the light emitting diode package  120  on the surface  112  of the heat dissipation block  110  can be carried away by the air current to avoid the light emitting diode package  120  from being over heated. Thus, the light emitting efficiency and the lifetime of the light emitting diode package  120  can be improved. 
     In order to obtain a relatively better heat dissipation effect, the fan module  140  of the present invention has a baffle plate  146  circling the opening  142 . The baffle plate  146  can prevent the air current from flowing along a direction opposite to the flowing direction A 1  so as to keep the thermal air contact with the heat dissipation block  110  from flowing back and to further improve the heat convection. Therefore, the light source module  100  of the present embodiment has better heat dissipation efficiency. It should be noticed that the flowing direction A 1  of the air current in the opening  142  is not limited by the direction drawn in  FIG. 2 . In other embodiments, the flowing direction of the air current in the opening can be opposite to the flowing direction A 1  shown in  FIG. 2 . 
     In addition, in the present embodiment, the heat dissipation block  110  can have a solder point  116 . The material of the heat dissipation block  110  can be, for example but not limited to, solder material. Specifically, the material of the solder point  116  can be, for example, nickel. The light emitting diode package  120  can be configured on the heat dissipation block  110  by being soldered on the solder point  116 , and nickel is adapted to soldering with the solder material. For instance, the light emitting diode package  120  can combine with the heat dissipation block  110  by using the surface mount technology (SMT) to enhance a manufacturing efficiency of the light source module  100 . 
       FIG. 3  is a schematic enlarged view showing the conductive device of  FIG. 1  equipped with the light emitting diode package. As shown in  FIG. 1 ,  FIG. 2  and  FIG. 3 , in the present embodiment, the light source module  100  further comprises two conductive devices  150 , two insulating rings  160  and two conductive lines  190 . The conductive devices  150  can be, for example, conductive pillars electrically connected to the light emitting diode package  120  and the circuit board  130 . The heat dissipation block  110  has a recess  114  for disposing the light emitting diode package  120  therein, and the conductive devices  150  penetrate through the heat dissipation block  110 , and the light emitting diode package  120  is electrically connected to one end of each of the conductive devices  150 . 
     Furthermore, the insulating rings  160  circles the corresponding conductive devices  150  respectively so as to electrically insulate the conductive devices  150  from the heat dissipation block  110 . In addition, the other end of each of the conductive devices  150 , which is far away from the light emitting diode package  120 , protrudes from the insulating ring  160  and has a protruding edge  152 . In the present embodiment, the radius of the outer periphery of each protruding edge  152  is larger than the radius of the inner periphery of each insulating ring  160  so that one end of the conductive lines  190  can securely wind between the insulating rings  160  and the protruding edges  152  without being easily falling off. 
     In the present embodiment, the baffle plate  146  has a through hole  146   a  formed by indenting a portion of the outer periphery of the baffle plate  146 . One end of each conductive line  190  winds between the insulating ring  160  and the protruding edge  152 , and the other end of each conductive line  190  passes through the through hole  146   a  and is connected to the circuit board  130  so that the light emitting diode package  120  is electrically connect to the circuit board. 
       FIG. 4  is a schematic view of the lamp cup in the light source module of  FIG. 1  before the lamp cup is assembled.  FIG. 5  is a schematic view of the lamp cup in the light source module of  FIG. 1  after the lamp cup is assembled. As shown in  FIG. 1 ,  FIG. 4  and  FIG. 5 , in the present embodiment, the light source module  100  further comprises a lamp cup  170  and a connector  180  fixed on the lamp cup  170 , and the connector  180  is electrically connected to the circuit board  130  in the lamp cup  170 . The fan module  140  and the heat dissipation block  110  are configured on the lamp cup  170 , and the heat dissipation block  110  is configured on the fan module  140 . 
     As shown in  FIG. 2 ,  FIG. 4  and  FIG. 5 , more specifically, the fan module  140  and the heat dissipation block  110  can be, for example, locked on the lamp up  170 . The lamp cup  170  can have a plurality of assembling holes  172 . A plurality of fixing pieces  174  can pass through the assembling holes  172  respectively to lock the lamp cup  170  and the fan module  140  on the heat dissipation block  110 . 
     In addition, the lamp cup  170  can have a slot  176 . During the assembly of the light source module  100 , the connector  180  can be buckled in the slot  176  so that the connector  180  can be stably configured in the lamp cup  170 . 
     Accordingly, in the light source module of the embodiment of the present invention, since the light emitting diode package is configured on the surface of the heat dissipation block, the heat generated by the light emitting diode package can be directly conducted to the heat dissipation block without being blocked by the circuit board. Therefore, the light source module of the embodiment of the present invention possesses a relatively better heat dissipation efficiency. Moreover, in the light source module of the embodiment of the present invention, because the fan module has the baffle plate to prevent the air current from flowing along a direction opposite to the flow direction of the air current in the opening and to further improve the heat convection, the light source module possesses a relatively better heat dissipation efficiency. 
     Although the invention has been described with reference to the above embodiments, it will be apparent to one of the ordinary skill in the art that modifications to the described embodiment may be made without departing from the spirit of the invention. Accordingly, the scope of the invention will be defined by the attached claims not by the above detailed descriptions.