Abstract:
Provided is a light emitting device package. It is a substrate comprising a top and a bottom surfaces being substantially parallel to each other; a light emitting diode chip on the substrate; a frame disposed around the light emitting diode chip and configured to reflect light emitted from the light emitting diode chip, the frame having an opening; a first metal layer disposed on the top surface of the substrate; a second metal layer disposed on the top surface of the substrate; a third metal layer disposed on the bottom surface of the substrate; a through hole connected between the first metal layer and the third metal layer; a material being filled in the opening of the frame; and a lens disposed on the material, wherein the substrate and the frame are separate from each other.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 14/305,957 filed on Jun. 16, 2014 (now U.S. Pat. No. 9,269,879, issued Feb. 2, 2016), which is a continuation of U.S. patent application Ser. No. 13/872,688 filed Apr. 29, 2013 (now U.S. Pat. No. 8,772,813, issued Jul. 8, 2014), which is a continuation of application Ser. No. 13/176,538, filed on Jul. 5, 2011 (now U.S. Pat. No. 8,431,947, issued Apr. 30, 2013), which is a continuation of application Ser. No. 12/552,911, filed on Sep. 2, 2009 (now U.S. Pat. No. 7,989,835, issued Aug. 2, 2011), which is a continuation of application Ser. No. 11/583,043 filed on Oct. 19, 2006 (now U.S. Pat. No. 7,592,638, issued Sep. 22, 2009), which claims priority of Application No. 10-2005-0098594, filed in the Republic of Korea on Oct. 19, 2005; the entire contents of all are hereby incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a light emitting diode and a package of a light emitting diode. 
     Description of the Related Art 
     A light emitting diode (LED) is a light emitting device constituting a light source by using compound semiconductor materials such as GaAs, AlGaAs, GaN, InGaN, and AlGaInP. The LED has the advantage of emitting various colors on materials of the semiconductor. 
     Generally, the characteristics of the LED are determined according to high-luminance light-emitting, luminance, color range of the emitted light, and the like. The characteristics of the LED device are primary determined by the compound semiconductor materials used in the LED device. Also, the characteristics are secondly determined by package construction for mounting a chip. Especially, in order to obtain distribution of a luminance angle according to high luminance and user requirements, the primary element of the materials is limited. So, recently, many people are interested in the package construction. 
     The second element of the LED package construction largely affects the luminance and the high-luminance light-emitting. Referring to a conventional package illustrated in  FIGS. 1A through 1C , a lamp type LED and a surface mounted type LED will be described, separately. 
     For a lamp type LED package  10  illustrated in  FIG. 1A , a metal electrode face of a cup shape with a predetermined angle is provided on the upper side of a lead frame  3 B among two lead frames  3 A,  3 B. An LED device  5  is mounted on the upper side of the metal electrode face. Also, the lamp type LED  10  is packaged by a domed case  7  which is made of transparent molding resin. 
     On the other hand, as illustrated in  FIG. 1B , a surface mounted type LED package  20  has a package  11  which is made of molding epoxy resin. Also, an LED device  15  is arranged on a mounting region where an inclined angle is small, and an electrode (not shown) is connected by a wire  13 . 
     By such package construction, in the lamp type LED package  10 , the domed case  7  working as a lens, can control the luminance. Especially, by making the distribution of the luminance angle narrow, the luminance at a predetermined luminance angle can be raised. Also, light which is emitted from a source is reflected on the metal electrode face of the cup shape to raise the luminance. When comparing with the lamp type LED package  10 , in the surface mounted type LED package  20 , distribution of the luminance angle is made wide by the package  11 , and the luminance itself is low. In this manner, the luminance and the distribution of the luminance are largely affected by the package construction. Therefore, in the case of the surface mounted type LED package  20  using molding resin, a development to add a reflecting member is being processed. The reflecting member is a metalized construction having a predetermined reflecting angle and formed at one side of the mounting region. 
     However, since the construction of the LED package using the molding resin does not have high enough thermal resistance for heat generated by high luminance light, the LED package is not appropriate for the high-luminance emitting-light. 
       FIG. 1C  is a sectional view illustrating a ceramic LED package which is made of a conventional ceramic substrate. 
     Referring to  FIG. 1C , a construction  30  of the ceramic LED package has two ceramic substrates  21  and  22 . Each the ceramic substrate has a plurality of ceramic sheets which are laminated. Mounting region for an LED device  25  is located on a lower ceramic substrate  21 . An electrode  23  which is connected to the LED device  25  by a wire  27  is extended, through both sides of the ceramic substrates, from the mounting region to the bottom of the substrate. An upper ceramic substrate  22  having a predetermined cavity surrounds the mounting region for the LED device  25 . 
     Here, since the cavity for the mounting region receiving the LED device  25  is formed by punching or cutting, a cutting face is vertically formed at all times as illustrated in  FIG. 1C . Therefore, it is difficult to form a reflecting face which can control the luminance angle by making a predetermined inclined plane inside of the cavity. In addition, it makes a manufacturing process complicated and increases the cost that the ceramic substrate  22  supplying the cavity is made of the plurality of substrates which are laminated. 
     Also, since the heat which is generated by the high luminance light is emitted through only the electrode  23 , emitting heat is not rapid, which has a bad influence on characteristics of operation of the LED device  25 . Therefore, an LED package which can efficiently emit heat in a ceramic package has been strongly required. 
     In addition, it takes manufacturing time longer and increase the cost, because the ceramic substrate  22  is made of the plurality of substrates which are laminated. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention is related to a light emitting diode package that substantially obviates one or more problems due to limitations and disadvantages of the related art. 
     The embodiment of the present invention provides an LED package comprising: a substrate, an electrode or more formed in the substrate, an LED mounted on a side of the substrate and electrically connected to the electrode, and at least one heatsink hole formed to pass through the substrate, for emitting heat generated from the LED to the outside. 
     The embodiment of the present invention provides an LED package comprising: a substrate, an electrode or more formed in the substrate, an LED mounted on one side of the substrate and electrically connected to the electrode, a heatsink portion formed in the substrate, for emitting out heat generated from the LED, and a reflecting member formed around the LED, for reflecting light emitted from the LED, the reflecting member being injection molded. 
     The embodiment of the present invention provides an LED package comprising: a substrate, an LED mounted on one side of the substrate, for emitting light using an external power, at least one heatsink hole formed in a portion of the substrate that is aligned with the LED, for emitting out heat generated from the LED, and a reflecting member formed of a resin and separately coupled on the substrate around LED, for reflecting light emitted from the LED. 
     The embodiment of the present invention provides an LED package comprising: a substrate, an LED mounted on one side of the substrate, for emitting light using an external power, a plurality of heatsink holes each having a diameter of about 50-100 μm and formed in at least a portion of the substrate that is aligned with the LED, for emitting out heat generated from the LED, and a reflecting member formed of a resin and formed outside the LED, for reflecting light emitted from the LED. 
     For the LED package of the embodiment of the invention, it is easy to control luminance according to the luminance and an angle. Since heat is efficiently emitted, the LED package is easily applicable to a high luminance LED. Also, by manufacturing the LED package with a simple construction, the manufacturing process is convenient and the cost is low. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A through 1C  are conventional constructions of an LED package, wherein  FIG. 1A  is a sectional view illustrating an lamp type LED package,  FIG. 1B  is a sectional view illustrating a surface mounted type LED package, and  FIG. 1C  is a sectional view illustrating a ceramic LED package; 
         FIG. 2  is a sectional view illustrating an LED package according to the present invention; 
         FIG. 3  is a plan view illustrating the LED package according to the present invention; 
         FIG. 4  is a plan view illustrating a reflecting member in an LED package according to another embodiment of the present invention; and 
         FIG. 5  is a sectional view illustrating a package describing the embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
       FIG. 2  is a sectional view illustrating an LED package  200  according to the present invention. 
     Referring to  FIG. 2 , the LED package  200  of the present invention includes a ceramic substrate  240 , an LED  210  mounted on the upper side of the ceramic substrate  240 , a reflecting member  220  formed around the portion in which the LED  210  is mounted, an electrode  260  and  261  and wire  230  and  231  provided on the upper side of the ceramic substrate  240  and electrically connected to the LED  210 , and a heat sink  270  and a heatsink hole  280  emitting out heat generated from the LED  210 . 
     In detail, since the ceramic substrate  240  is provided as a single layer, it is possible to reduce the manufacturing process and take the manufacturing time shorter. 
     Also, it is advantageous for the improvement of luminance and the control of a luminance angle that the reflecting member  220  is provided surrounding all around the LED  210 . In detail, the reflecting member  220  may be made of polypropylene (PP) having a high reflectance coating and the inner surface may be cylindrical as illustrated in  FIG. 3 . Further, the shape of the inner surface of the reflecting member  220  is that the upper diameter may be larger than the lower diameter. The reason is because, although it achieves some increase in luminance to insert the reflecting member  220  which is formed as a cylindrical type into the mounting region, it may increase the luminance of the entire light as well as the luminance of upward light to control the difference of the diameters by making the lower diameter be smaller than the upper diameter. 
     The reflecting member  220  can be easily made by such as a PP injection molding. A metal layer (not shown) such as Al, Ag is formed on the inner surface of the reflecting member  220  for reflection. Also, a plurality of protruding contact portions  250  may be provided on the lower side of the reflecting member  220  in order to be bonded to the ceramic substrate  240 . The protruding contact portions  250  not only guide the reflecting member  220  for bonding to an appropriate position of the ceramic substrate  240  but also strengthen the bonding between the ceramic substrate  240  and the reflecting member  220 . 
     Also, the electrode  260  and  261  is provided for the electrical conduction and the thermal conduction, wherein the electrode  260  is extended to the bottom through the side of the ceramic substrate  240  and supplies a run current to the LED  210  through the wire  230  and  231  as illustrated in  FIG. 3 . By the electrode  260  which is provided further to the bottom of the LED  210 , heat generated from the LED  210  is more rapidly transmitted downward to be emitted downward through the heatsink hole  280  or be emitted into the side along the electrode  260  itself. As a matter of course, when the electrode  260  does not work like this, the electrode  260  is provided not as a plate type but as a wire type on the ceramic substrate  240  and just conducts electricity. 
     The heat sink  270  is provided on the bottom of the ceramic substrate  240 , facing the LED  210  and having a predetermined shape, for example, a circular type or a tetragonal type, and contacts the heatsink hole  280  to emit the heat of the LED transmitted through the heatsink hole  280 . 
     The heatsink hole  280  has a plurality of holes having the diameter of about 50-100 μm in the ceramic substrate  240 . A metal material, for example, Ag is filled in the heatsink hole  280  by electroplating or a metal deposition. The heat sink  270  is united with the heatsink hole  280 . Since the filler in the heatsink hole  280  has high thermal conductivity, it is apparent that a great quantity of heat is more rapidly transmitted through the heatsink hole  280 . 
     The process of the configuration of the LED package  200  will be described in the following in more detail. 
     First, the plurality of heatsink holes  280  are formed in the ceramic substrate  240  which is made of a single layer by a mechanical method or chemical etching. Also, Ag is filled in the heatsink holes  280  by electroplating or a metal deposition. 
     After filling Ag in the heatsink holes  280 , the electrode  260  and the heat sink  270  are formed in order to cover all the heatsink holes  280  and the LED  210  is mounted on a predetermined position of the electrode  260 . Subsequently, the wire  230  and  231  is formed in order to be connected to the LED  210  and the electrode  260  and  261 , respectively. 
     The reflecting member  220  is bonded to the ceramic substrate  240  by the plurality of protruding contact portions  250  and a silicon based bonding material, to surround the mounting region of the LED  210 . As a matter of course, for the protruding contact portions  250  by being just fitted into the ceramic substrate  240 , the reflecting member  220  may be bonded or by only a bonding material without the protruding contact portions  250 , the reflecting member  220  may be bonded. However, it improves the bonding strength and the workability to bond around the protruding contact portions  250  after the reflecting member  220  is guided by the protruding contact portions  250 . Here, the reflecting member  220  which is bonded may be the tetragonal type illustrated in  FIG. 4  as well as the circular type illustrated in  FIG. 3 . 
     In addition, since the reflecting member  220  is simply bonded to the single layer ceramic package, the manufacturing process of the ceramic package becomes simple and the characteristics of the luminance can be improved through the material of the reflecting member  220  and the reflectance coating. 
     After the reflecting member  220  is bonded, on the upper side of the LED  210 , namely on a cavity formed inside the reflecting member  220 , a molding lens (not shown) can be further formed by filling a transparent epoxy resin or a silicon based resin. 
       FIG. 5  is a sectional view illustrating a package describing another embodiment of the present invention. When compared with  FIG. 2 , only parts which are characteristically different are described and the others follow the descriptions in the precedent embodiment. 
     Referring to  FIG. 5 , a lens placing part  301  for placing a lens  300  is further formed in a reflecting member  220 . The prepared lens  300  is placed on the lens placing part  301 . This type is more convenient for attaching the lens  300 . The reason is because the reflecting member  220 , as a single part, is previously prepared by injection molding to easily provide the lens placing part  301 , that the lens  300  is conveniently placed. 
     According to other embodiment, by further forming an additional supporting member in the reflecting member  220 , when a mold material is filled in a cavity provided in the reflecting member  220 , the mold material and the reflecting member  220  can be more strongly supported. 
     According to still other embodiment, although metal may be filled in the heatsink holes, it is possible to emit thermal by only air, without a filler. 
     According to the present invention as described above, the following Industrial applicability and advantageous effect can be obtained. First, it makes the manufacturing process of the LED package more simple, and makes the shape of the reflecting member  220  more appropriate and preferable that the reflecting member  220  is bonded on the ceramic substrate  240  by the bonding material after the reflecting member  220  is made by an additional process such as the injection molding. For example, for the inner shape of the reflecting member  220 , the inclined angle of the inclined plane is more variously controlled and the inclined plane may be formed to have a direction. That is, the inner shape of the reflecting member  220  is various on the shape that user wants. 
     According to the present invention, under the construction of the LED package  200 , since heat generated from the LED  210  is transmitted to the electrode  260 , the heatsink holes  280 , and the heat sink  270  to be emitted, the problems in the thermal stress and the degradation of an LED device which are caused by heat can be solved. Therefore, since the heat generated from the LED  210  is emitted downward at minimum distance through the heatsink holes  280  provided in the mounting region of the LED  210 , the reliability of the LED  210  can be guaranteed. Further, since the heat is emitted along the electrode  260 , the heat emitting efficiency is more improved. Therefore, a high luminance LED can be also stably supported without the degradation, and the reliability of the high luminance LED package is improved. 
     In addition, since the reflecting member  220  is simply bonded to the single layer ceramic substrate  240 , the manufacturing process of the ceramic package becomes simple. 
     Also, since the ceramic substrate  240  is a single layer, it does not have to be laminated. Therefore, the manufacturing process becomes more simple. 
     In addition, since the reflecting member  220  is made of not a conventional metal material but a PP material, the weight of the ceramic package can be reduced. Since the reflecting member  220  is made by a resin injection molding, the construction of the reflecting member  220  is various and is made conveniently on the shape that user wants.