Abstract:
A light emitting diode package is disclosed. It includes a chip, a slug, a PCB, a lens and a reflector. The chip is mounted on the slug. The slug transmits the heat of the chip out of the light emitting diode package. The PCB connects the chip with circuits or wires. The lens transmits the emitting light of the chip out of the light emitting diode package. The reflector reflects the emitting light of the chip, and combines the slug, the PCB and the lens together.

Description:
RELATED APPLICATIONS 
       [0001]    The present application is based on, and claims priority from, Taiwan Application Serial Number 95212321, filed Jul. 13, 2006, the disclosure of which is hereby incorporated by reference herein in its entirety. 
       BACKGROUND 
       [0002]    1. Field of Invention 
         [0003]    The present invention relates to a light emitting diode package. More particularly, the present invention relates to a light emitting diode package with several kinds of pads, and all elementary parts fixed by the reflector. 
         [0004]    2. Description of Related Art 
         [0005]    An LED is a lighting device that has quickly developed in recent years. Compared with traditional light sources, the advantages are smaller volume, short response time, long life, low driving voltage and better anti-shock capability. According to chip type and manufacturing process control, various kinds of monochromatic LED lighting devices could be produced. 
         [0006]    A certain monochromatic LED matches a specific composition of phosphor powder, which could produce white light visible to humans using the optics principle of complementary colors. The best combination of light emitting efficiency includes a blue LED and a specific composition of phosphor powder at present. In addition, arranging the red LED, the green LED and the blue LED in a package closely, which could produce a white light visible to humans vision using the optics principle of complementary colors, too. 
         [0007]    With Lumen per Watt (Im/W) provided by an LED device improving progressively, the high power white LED device has already approached the performance of the traditional incandescent lamp. However, various application problems of traditional package structures have arisen. 
         [0008]    For example, conventional LED devices are electrically connected to a PCB (Printed Circuit Board) via dual-in-line-package (DIP) pins, but this approach can form voids when poor quality solder paste is used or man-made soldering errors miss some pins. Furthermore, the thickness of the whole package structure cannot be thinned out further. 
         [0009]    Therefore being able to offer a kind of LED device that can be combined closely with circuit board is very important. The LED device can be applied when the least number of LED devices are required to output various kinds of color. The embodiment of the present invention has various kinds of solderable circuits for user to vary outputting light color or luminous intensity in accordance with demand. Moreover, it can reduce the quantity of LED devices per unit area. 
       SUMMARY 
       [0010]    A light emitting diode package includes a printed circuit board, a heat sink, a lens and a reflector. 
         [0011]    The printed circuit board includes an indentation, a plurality of through holes and a plurality of solderable circuits. The heat sink includes a chip-mounting set, a plurality of horn-like through holes, a plurality of protrusions and a hooking part. The heat sink putting in the indentation, and the plurality of protrusions and the PCB forming an embedded structure. The lens placed on the printed circuit board. The reflector passes through the plurality of through holes and the plurality of horn-like through holes, and surrounding a surrounding edge of the lens. 
         [0012]    The plurality of solderable circuits extends from the top-side of the printed circuit board to the side of the printed circuit board, and then connects to the bottom-side of the printed circuit board. 
         [0013]    The reflector includes a circular part, a plurality pillars and a rectangular part. The circular part surrounded a surrounding edge of the lens. The plurality pillars put in the plurality of through holes. The rectangular part includes a plurality of horn-like pillars. The plurality of horn-like pillars put in the plurality of horn-like through holes, and the rectangular part placed in the indentation. The rectangular part and the hooking part form an embedded structure. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    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. In the drawings, 
           [0015]      FIG. 1  illustrates a perspective view of an LED device according to an embodiment of the present invention; 
           [0016]      FIG. 2  illustrates a perspective and cross-sectional view of an LED device according to an embodiment of the present invention; 
           [0017]      FIG. 3  illustrates a side view of an LED device according to an embodiment of the present invention; 
           [0018]      FIG. 4  illustrates a top view of an LED device according to an embodiment of the present invention; 
           [0019]      FIG. 5  illustrates a bottom view of an LED device according to an embodiment of the present invention; 
           [0020]      FIG. 6A  illustrates a perspective and top view of a PCB according to an embodiment of the present invention; 
           [0021]      FIG. 6B  illustrates a perspective and bottom view of a PCB according to an embodiment of the present invention; 
           [0022]      FIG. 7A  illustrates a perspective and cross-sectional view of a reflector according to an embodiment of the present invention; 
           [0023]      FIG. 7B  illustrates a partial and cross-sectional view of an LED device according to an embodiment of the present invention; 
           [0024]      FIG. 7C  illustrates a partial and cross-sectional view of an LED device according to an embodiment of the present invention; 
           [0025]      FIG. 8  illustrates a side view of a reflector according to an embodiment of the present invention; 
           [0026]      FIG. 9  illustrates a top view of a reflector according to an embodiment of the present invention; 
           [0027]      FIG. 10  illustrates a bottom view of a reflector according to an embodiment of the present invention; 
           [0028]      FIG. 11  illustrates a perspective and cross-sectional view of a heat sink according to an embodiment of the present invention; 
           [0029]      FIG. 12  illustrates a side view of a heat sink according to an embodiment of the present invention; 
           [0030]      FIG. 13  illustrates a top view of a heat sink according to an embodiment of the present invention; and 
           [0031]      FIG. 14  illustrates a bottom view of a heat sink according to an embodiment of the present invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0032]    Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
         [0033]    While the specification concludes with claims defining the features of the invention that are regarded as novel, it is believed that the invention will be better understood from a consideration of the following description in conjunction with the figures, in which like reference numerals are carried forward. 
         [0034]    Refer to  FIG. 1 .  FIG. 1  illustrates a perspective view of an LED device according to an embodiment of the present invention. An LED device  100  includes a PCB  110 , a reflector  120  and a lens  130 . 
         [0035]    The PCB  110  includes several solderable circuits  111 , and every solderable circuit  111  extends from the top-side of the PCB  110  to the side of the PCB  110 , and then connects to the bottom-side of the PCB  110 . 
         [0036]    The reflector  120  reflects the light from LED chip to the lens  130 , and combines other parts for fixing. The lens  130  guides the light from the LED chip out of the LED device  100 . 
         [0037]    Refer to  FIG. 2 .  FIG. 2  illustrates a perspective and cross-sectional view of an LED device according to an embodiment of the present invention. In  FIG. 2 , the LED device  100  includes a heat sink  140 . 
         [0038]    The top-side of the heat sink  140  has a chip-mounting area  141 . The chip-mounting area  141  is a rectangular indentation for mounting an LED chip on the chip-mounting area  141  and electric connecting with the heat sink  140 . 
         [0039]    Several configurations can be observed from the cross-section of the PCB  110 , Observable configurations include the reflector  120 , the lens  130  and the heat sink  140 . The reflector  120  passes through the reserve through holes of the PCB  110 , then squeezes and fixes the PCB  110  from the top-side and the bottom-side respectively. The surrounding edge of the lens  130  is besieged and fixed by the circular part of the reflector  120 . A part of the reflector  120  heated by the apparatus, which become deformed to squeeze and fix the lens  130 . The reflector  120  also passes through the reserve through holes of the heat sink  140 , and embedded with a hooking structure. 
         [0040]    Refer to  FIG. 3 .  FIG. 3  illustrates a side view of an LED device according to an embodiment of the present invention. A part of the heat sink  140  is set in the PCB  1   10 , and the other parts of the heat sink  140  are exposed to the exterior of the LED device  100 . The part of the heat sink  140  set in the PCB  110  is combined closely to the reflector  120 ; and the other parts of the heat sink  140  exposed to the exterior of the LED device  100  increases the heat-dissipation capability. 
         [0041]    Refer to  FIG. 4 .  FIG. 4  illustrates a top view of an LED device according to an embodiment of the present invention. The lens  130  is surrounded by the circular part of the reflector  120 . On the top-side of the PCB  110 , there are several solderable circuits connected to the base distributed radially on the lens  130 . There is an orientating hole  112  at a corner of the PCB  110  for orientating the LED device  100 . 
         [0042]    Refer to  FIG. 5 .  FIG. 5  illustrates a bottom view of an LED device according to an embodiment of the present invention. The solderable circuits  111  extend to the bottom-side of the PCB  110  for the convenience of circuit assembling. The heat sink  140  exposed to the outside of the LED device  100  means conducts heat from the inside of the LED device  100 . 
         [0043]    Refer to  FIG. 6A  and  FIG. 6B .  FIG. 6A  and  FIG. 6B  illustrates a top view and a bottom view of a PCB according to an embodiment of the present invention respectively. The PCB  110  includes several through holes  113 , through holes  114  and an indentation  115 . 
         [0044]    The through hole  113  is where the heat sink  140  is set into the LED device  100 . The through hole  114  enables communication between the top-side and the bottom-side of the PCB  110  for the fluid raw material of reflector flowing in the manufacturing process. When the environmental temperature is lowered below a certain degree, the fluid raw material of the reflector will form a solid reflector  120  to squeeze and fix the PCB  110 . 
         [0045]    The indentation  115  is located on the bottom-side of the PCB  110 , and the indentation  115  is a dented space to contain the heat sink  140 , which provides more contact area for the heat sink  140  and the PCB  110 . Hence, the heat of the PCB  110  can be conducted to the outside of the LED device  100  more efficiently. 
         [0046]    Refer to  FIG. 7A .  FIG. 7A  illustrates a perspective and cross-sectional view of a reflector according to an embodiment of the present invention. The reflector  120  includes a circular part  121 , several pillars  122  and several horn-like pillars  123 . 
         [0047]    The circular part  121  is located on the top-side of the PCB  110 , and surrounds the lens  130 . The several pillars  122  are inserted through several through holes  113  of the PCB  110 , which connect with the circular part  121  and the part under the bottom-side of the PCB  110  of the reflector  120 . The several horn-like pillars  123  are placed in the horn-like through holes of the heat sink  140 , and cooperate with the “C” type structure under the bottom-side of the PCB  110  of the reflector  120  for tightly fixing the heat sink  140 . 
         [0048]    Refer to  FIG. 7B  and  FIG. 7C .  FIG. 7B  and  FIG. 7C  illustrate two partial and cross-sectional views of an LED device according to an embodiment of the present invention.  FIG. 7B  and  FIG. 7C  are illustrated by referring to  FIG. 2 . The pillar  122  of the reflector  120  put in the through hole of the PCB  110 , the part higher than the PCB  110  of the reflector  120  is a part of the circular part  121 . The horn-like pillars  123  of the reflector  120  cooperate with the horn-like through hole of the heat sink  140  to prevent the heat sink  140  from falling downwards. 
         [0049]    Refer to  FIG. 8 ,  FIG. 9  and  FIG. 10 .  FIG. 8 ,  FIG. 9  and  FIG. 10  illustrate a side view, a top view and a bottom view of a reflector according to an embodiment of the present invention respectively. The distances between every two pillars  122  is equidistant This arrangement provides a firm combination of one part above the PCB  110  of the reflector  120  and another part below the PCB  110  of the reflector  120 . In  FIG. 9 , the center of a rectangular part  124  includes a through hole  125  located at the center of the circular part  121  for inserting the heat sink  140 . The rectangular part  124  can cooperate with the indentation  115  in  FIG. 6B  exactly. 
         [0050]      FIG. 11  illustrates a perspective and cross-sectional view of a heat sink according to an embodiment of the present invention. The heat sink  140  includes a chip-mounting area  141 , a horn-like through hole  142 , a protrusion  143  and a hooking part  144 . 
         [0051]    The chip-mounting area  141  can be mounted on at least one LED chip, and be electrically connected to the heat sink  140  and the solderable circuit  111 . The LED chip can only be electrically connected with the solderable circuit  111  in accordance with position of the solderable pad of the LED chip. 
         [0052]    The horn-like through hole  142  and the protrusion  143  means the reflector  120  and the other parts can be connected more closely. The horn-like pillar  123  put in the horn-like through hole  142 , and the protrusion  143  embed with the PCB  110  to form an embedded structure for preventing the heat sink  140  from falling off. The hooking part  144  cooperates with the rectangular part  124  to form a more steady combination. 
         [0053]    Refer to  FIG. 12 ,  FIG. 13  and  FIG. 14 . Refer to  FIG. 12 ,  FIG. 13  and  FIG. 14  illustrate a side view, a top view and a bottom view of a heat sink according to an embodiment of the present invention respectively. The surrounding of the heat sink  140  has several protrusions  143 , and the hooking part  144  also surrounds the bottom of the heat sink  140 . The protrusion  143  and the hooking part  144  increase the level of combination of the heat sink  140 , the PCB  110  and the reflector  120 . 
         [0054]    According to the composition and the embodiments above, there are many advantages of the present invention over the prior art, such as: 
         [0055]    1. The reflector passes through the other parts of the LED device, which can make the durability of LED device structure better than conventional LED devices. Such as, this package structure can reduce the deformation and delamination caused by heat stress. 
         [0056]    2. The solderable circuits of the PCB can apply to various directional light sources. Users can mount at least one LED chip for changing the outputting light color or intensity, and reduce amount of LED device mounting in the unit area. 
         [0057]    It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.