Patent Publication Number: US-2023155098-A1

Title: Light emitting device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation application of U.S. patent application Ser. No. 17/147,455, filed on Jan. 13, 2021, which is a continuation application of the U.S. patent application Ser. No. 16/449,445, filed on Jun. 24, 2019, which issued as U.S. Pat. No. 10,923,643, which claims priority under 35 U. S. C. § 119 to Japanese Patent Application No. 2018-120209, filed Jun. 25, 2018. The contents of these applications are incorporated herein by reference in their entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present disclosure relates to a light emitting device. 
     Discussion of the Background 
     Various packages used in light emitting devices have been disclosed. For example, Japanese Unexamined Patent Application Publication No. 2013-101996 discloses a package obtained by stacking a first lead frame and a second lead frame that have different shape patterns. 
     SUMMARY OF THE INVENTION 
     According to one aspect of the present invention, a light emitting device includes a package and a light emitting element. The package includes a first lead, a second lead, and a molded body. The light emitting element is provided on the second lead. The first lead includes a first electrode terminal extending in a longitudinal direction and having a first thickness in a thickness direction perpendicular to the longitudinal direction, and a first holding portion connected to the first electrode terminal and having a thickness smaller than the first thickness in the thickness direction, the first holding portion having a front surface and a rear surface opposite to the front surface in the thickness direction. The second lead includes a second electrode terminal facing the first electrode terminal in the thickness direction, and a connection electrically connected to the first lead without adding additional material. The molded body holds the first lead and the second lead and covers the front surface and the rear surface of the first holding portion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings. 
         FIG.  1 A  is a schematic perspective view illustrating a configuration of a package and a light emitting device according to a first embodiment; 
         FIG.  1 B  is a schematic plan view illustrating the configuration of the package and the light emitting device according to the first embodiment; 
         FIG.  2 A  is a schematic sectional view taken along the line IIA-IIA in  FIG.  1 B ; 
         FIG.  2 B  is a schematic sectional view taken along the line IIB-IIB in  FIG.  1 B ; 
         FIG.  3 A  is a schematic plan view illustrating a configuration of a first lead according to the first embodiment; 
         FIG.  3 B  is a schematic plan view illustrating a configuration of a second lead according to the first embodiment; 
         FIG.  4 A  is a schematic perspective view illustrating the configuration of the first lead according to the first embodiment that is provided with a first molded body; 
         FIG.  4 B  is a schematic perspective view illustrating the configuration of the second lead according to the first embodiment that is provided with a second molded body; 
         FIG.  5 A  is a schematic sectional view illustrating a step of forming the first molded body on the first lead in a method of manufacturing the package according to the first embodiment; 
         FIG.  5 B  is a schematic sectional view illustrating a step of forming the second molded body on the second lead in the method of manufacturing the package according to the first embodiment; 
         FIG.  6 A  is a schematic sectional view illustrating a step of mounting a light emitting element in a method of manufacturing the light emitting device according to the first embodiment; 
         FIG.  6 B  is a schematic sectional view illustrating a step of forming underfill in the method of manufacturing the light emitting device according to the first embodiment; 
         FIG.  6 C  is a schematic sectional view illustrating a step of forming a frame body in the method of manufacturing the light emitting device according to the first embodiment; 
         FIG.  6 D  is a schematic sectional view illustrating a step of forming a covering member in the method of manufacturing the light emitting device according to the first embodiment; 
         FIG.  7 A  is a schematic sectional view illustrating a configuration of a package and a light emitting device according to a second embodiment and corresponding to the schematic sectional view taken along the line IIA-IIA in  FIG.  1 B ; 
         FIG.  7 B  is a schematic sectional view illustrating the configuration of the package and the light emitting device according to the second embodiment and corresponding to the schematic sectional view taken along the line IIB-IIB in  FIG.  1 B ; 
         FIG.  8 A  is a schematic sectional view illustrating a state in which a second lead is disposed on a first lead in a method of manufacturing the package according to the second embodiment; 
         FIG.  8 B  is a schematic sectional view illustrating a step of forming a molded body on the first lead and the second lead in the method of manufacturing the package according to the second embodiment; 
         FIG.  9 A  is a schematic sectional view illustrating a configuration of a light emitting device according to another embodiment and corresponding to the schematic sectional view taken along the line IIA-IIA in  FIG.  1 B ; 
         FIG.  9 B  is a schematic sectional view illustrating a configuration of a light emitting device according to another embodiment and corresponding to the schematic sectional view taken along the line IIB-IIB in  FIG.  1 B ; 
         FIG.  10    is a schematic plan view illustrating a configuration of a light emitting device according to another embodiment; 
         FIG.  11 A  is a schematic plan view illustrating a configuration of a second lead according to another embodiment; 
         FIG.  11 B  is a schematic plan view illustrating a configuration of a light emitting device according to another embodiment; 
         FIG.  12 A  is a schematic sectional view illustrating a step of forming a sheet member in a method of manufacturing a light emitting device according to another embodiment; and 
         FIG.  12 B  is a schematic sectional view illustrating a step of forming a side wall member in a method of manufacturing a light emitting device according to another embodiment. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals designate corresponding or identical elements throughout the various drawings. 
     Embodiments are described below with reference to drawings. The aspects described below, however, only exemplify a package, a light emitting device, and methods of manufacturing them to embody technical ideas of the present embodiments, and the present embodiments are not limited to these aspects. Further, the embodiments are not intended to limit the scope of the present invention only to, for example, the dimensions, the materials, and the shapes of constituent components, and the relative disposition among the constituent components described in the embodiments unless otherwise specified, and these details are no more than exemplification. The size, the positional relationship, and the like of members illustrated in the drawings are sometimes exaggerated for clear description. 
     First Embodiment 
       FIG.  1 A  is a schematic perspective view illustrating a configuration of a package and a light emitting device according to a first embodiment.  FIG.  1 B  is a schematic plan view illustrating the configuration of the package and the light emitting device according to the first embodiment.  FIG.  2 A  is a schematic sectional view taken along the line IIA-IIA in  FIG.  1 B .  FIG.  2 B  is a schematic sectional view taken along the line IIB-IIB in  FIG.  1 B .  FIG.  3 A  is a schematic plan view illustrating a configuration of a first lead according to the first embodiment.  FIG.  3 B  is a schematic plan view illustrating a configuration of a second lead according to the first embodiment.  FIG.  4 A  is a schematic perspective view illustrating the configuration of the first lead according to the first embodiment that is provided with a first molded body.  FIG.  4 B  is a schematic perspective view illustrating the configuration of the second lead according to the first embodiment that is provided with a second molded body. 
     Package 
     A package  1  includes a first lead  10 , a first molded body  61 , a second lead  20 , and a second molded body  62 . 
     The first lead  10  forms a prescribed wiring pattern. The first lead  10  includes an N-side first portion (hereinafter, referred to as a first N-side electrode terminal for convenience)  11  as an N-side electrode terminal, a P-side first portion (hereinafter, referred to as a first P-side electrode terminal for convenience)  12  as a P-side electrode terminal, and a third portion  13  as a heat dissipation terminal, with the portions spaced apart from each other in parallel. The first lead  10  also includes holding portions  15 ,  16 , and  17 . 
     The first N-side electrode terminal  11  is a member bonded to and conductive with an N-side second portion (hereinafter, referred to as a second N-side electrode terminal for convenience)  21  as an N-side electrode terminal of the second lead  20 . The first N-side electrode terminal  11  is positioned on the left side from the center of the first lead  10  in a planar view and is formed in a rectangular shape. 
     The first P-side electrode terminal  12  is a member bonded to and conductive with a P-side second portion (hereinafter, referred to as a second P-side electrode terminal for convenience)  22  as a P-side electrode terminal of the second lead  20 . The first P-side electrode terminal  12  is positioned on the right side from the center of the first lead  10  in a planar view and is formed in a rectangular shape. 
     The first N-side electrode terminal  11  and the first P-side electrode terminal  12  each have both surfaces thereof exposed from the first molded body  61 . 
     The heat dissipation terminal  13  is a member for promoting heat dissipation of a light emitting device  100 . The heat dissipation terminal  13  is formed in a rectangular shape at a center portion of the first lead  10  in a planar view. The heat dissipation terminal  13  is disposed being spaced apart from the first N-side electrode terminal  11  and the first P-side electrode terminal  12  and is electrically independent from the first N-side electrode terminal  11  and the first P-side electrode terminal  12 . 
     The heat dissipation terminal  13  has its front surface etched to about half of its thickness at a portion except an upper end and a lower end in a planar view (hereinafter, referred to as half-etching for convenience). The heat dissipation terminal  13  is half-etched to have a recess portion  13   a . The recess portion  13   a  is a groove portion continuously formed between side surfaces of the heat dissipation terminal  13  along the heat dissipation terminal&#39;s plate width, and the first molded body  61  is provided in the recess portion  13   a  as the groove portion. The heat dissipation terminal  13  has both surfaces thereof exposed from the first molded body  61  except the recess portion  13   a.    
     The holding portions  15 ,  16 , and  17  connect a plurality of first leads  10 . The holding portion  15  is formed continuously with the first N-side electrode terminal  11 , the holding portion  16  is formed continuously with the first P-side electrode terminal  12 , and the holding portion  17  is formed continuously with the heat dissipation terminal  13 . These holding portions  15 ,  16 , and  17  extend toward the exterior of the first lead  10  in a planar view. The holding portions  15 ,  16 , and  17  have rear surfaces thereof half-etched and the first molded body  61  is provided in the half-etched portions. The holding portions  15 ,  16 , and  17  have front surfaces thereof exposed from the first molded body  61 . 
     Here, the holding portions  15 ,  16 , and  17  are described as portions other than the first N-side electrode terminal  11 , the first P-side electrode terminal  12 , and the heat dissipation terminal  13 , respectively. The holding portions  15 ,  16 , and  17 , however, may be included in the first N-side electrode terminal  11 , the first P-side electrode terminal  12 , and the heat dissipation terminal  13 , respectively. 
     The second lead  20  is disposed on the first lead  10  and is face-to-face bonded to the first lead  10 . The second lead  20  forms a wiring pattern different from the shape of the first lead  10 . The second lead  20  includes the N-side second portion  21  as the second N-side electrode terminal, the P-side second portion  22  as the second P-side electrode terminal, an N-side fourth portion (hereinafter, referred to as an N-side terminal branched portion for convenience)  23  as an N-side terminal branched portion, a P-side fourth portion (hereinafter, referred to as a P-side terminal branched portion for convenience)  24  as a P-side terminal branched portion, and holding portions  25  and  26 . 
     The second N-side electrode terminal  21  overlaps the first N-side electrode terminal  11  of the first lead  10  in a planar view. The second N-side electrode terminal  21  is half-etched to have four recess portions  21   a  on a surface opposite to a surface facing the first lead  10 . Each of the recess portions  21   a  is a groove portion continuously formed between side surfaces of the second N-side electrode terminal  21  along the second N-side electrode terminal&#39;s plate width. The second lead  20  that has been bonded to the first lead  10  is filled, at the recess portions  21   a  as the groove portions, with a part of the second molded body  62  holding the second lead  20 . This makes the first lead  10  more strongly bonded to the second lead  20 . The second N-side electrode terminal  21  has both surfaces thereof exposed from the second molded body  62  except the recess portions  21   a.    
     The second P-side electrode terminal  22  overlaps the first P-side electrode terminal  12  of the first lead  10  in a planar view. The second P-side electrode terminal  22  is half-etched to have four recess portions  22   a  on a surface opposite to a surface facing the first lead  10 . Each of the recess portions  22   a  is a groove portion continuously formed between side surfaces of the second P-side electrode terminal  22  along the second P-side electrode terminal&#39;s plate width. The second lead  20  that has been bonded to the first lead  10  is filled, at the recess portions  22   a  as the groove portions, with a part of the second molded body  62  holding the second lead  20 . This makes the first lead  10  more strongly bonded to the second lead  20 . The second P-side electrode terminal  22  has both surfaces thereof exposed from the second molded body  62  except the recess portions  22   a.    
     The first lead  10  and the second lead  20  are bonded to each other by direct bonding at the portion on the front surface of the first lead  10  that is exposed from the first molded body  61  and the portion on the rear surface of the second lead  20  that is exposed from the second molded body  62  in the first N-side electrode terminal  11  and the second N-side electrode terminal  21 . 
     The first lead  10  and the second lead  20  are bonded to each other by direct bonding at the portion on the front surface of the first lead  10  that is exposed from the first molded body  61  and the portion on the rear surface of the second lead  20  that is exposed from the second molded body  62  in the first P-side electrode terminal  12  and the second P-side electrode terminal  22 . 
     Here, the direct bonding means bonding without using another member such as an adhesive agent. The direct bonding is preferably diffusion bonding. The diffusion bonding is a “method of closely attaching base materials to each other and pressing them with a pressure causing as little plastic deformation as possible, under a temperature condition of melting temperatures or lower of the base materials, to bond the base materials to each other utilizing atom diffusion generated between the surfaces of the base materials to be bonded.” 
     The direct bonding between the first N-side electrode terminal  11  and the second N-side electrode terminal  21  and between the first P-side electrode terminal  12  and the second P-side electrode terminal  22  requires no bonding member such as an adhesive agent or solder. Therefore, it is unnecessary to provide a groove portion or an opening portion to be filled with a bonding member on the leads, and the flexibility of designing increases. In addition, no provision of a bonding member improves the heat dissipation. In addition, no provision of a bonding member enables omission of a step of providing a bonding member to reduce costs. Further, the direct bonding gives an effect of, for example, preventing positional deviation during bonding of the first lead  10  to the second lead  20  and making it unnecessary to remove burr formed when a bonding member is protruded. 
     The N-side terminal branched portion  23  is a portion to which an N-side electrode  71  of a light emitting element  2  is bonded. The N-side terminal branched portion  23  is formed continuously with and perpendicularly to the second N-side electrode terminal  21  and extends toward the center of the second lead  20  in a planar view. The N-side terminal branched portion  23  is formed at a position that allows a portion thereof to overlap the heat dissipation terminal  13  of the first lead  10  in a planar view. The N-side terminal branched portion  23  allows the portion thereof to perpendicularly overlap the heat dissipation terminal  13  in a planar view. The heat dissipation terminal  13  of the first lead  10  has the recess portion  13   a  at the part that overlaps and faces the portion of the N-side terminal branched portion  23 . Therefore, in the heat dissipation terminal  13  and the N-side terminal branched portion  23 , the first lead  10  is spaced apart from the second lead  20  with the recess portion  13   a  interposed therebetween. The recess portion  13   a  between the heat dissipation terminal  13  and the N-side terminal branched portion  23  allows continuous filling with a part of the first molded body  61 . 
     The P-side terminal branched portion  24  is a portion at which a P-side electrode  72  of the light emitting element  2  is disposed. The P-side terminal branched portion  24  is formed continuously with and perpendicularly to the second P-side electrode terminal  22  and extends toward the center of the second lead  20  in a planar view. The P-side terminal branched portion  24  is formed at a position that allows a portion thereof to overlap the heat dissipation terminal  13  of the first lead  10  in a planar view. The P-side terminal branched portion  24  allows the portion thereof to perpendicularly overlap the heat dissipation terminal  13  in a planar view. The heat dissipation terminal  13  of the first lead  10  has the recess portion  13   a  at the part that overlaps and faces the portion of the P-side terminal branched portion  24 . Therefore, in the heat dissipation terminal  13  and the P-side terminal branched portion  24 , the first lead  10  is spaced apart from the second lead  20  with the recess portion  13   a  interposed therebetween. The recess portion  13   a  between the heat dissipation terminal  13  and the P-side terminal branched portion  24  allows continuous filling with a part of the first molded body  61 . 
     The heat dissipation terminal  13  is spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24  to enable the N-side terminal branched portion  23  and the P-side terminal branched portion  24  for mounting the light emitting element  2  to be disposed on an upper surface of the heat dissipation terminal  13 . Therefore, it is possible to form different electrode patterns between a front surface and a rear surface of the package  1 . This makes it possible to use a mounting substrate having the same wiring pattern as the wiring pattern on the rear surface of the package  1  and to use the light emitting element  2  having a different number of terminals such as three terminals. Accordingly, the package  1  has high flexibility of designing. 
     The perpendicular disposition of the N-side terminal branched portion  23  and the P-side terminal branched portion  24  to the heat dissipation terminal  13  in a planar view facilitates the mounting of the light emitting element  2 . In addition, such disposition facilitates manufacturing of the package  1 . 
     The continuous filling with a part of the first molded body  61  between the heat dissipation terminal  13  and both the N-side terminal branched portion  23  and the P-side terminal branched portion  24  enables the heat dissipation terminal  13  to be more securely spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24 . 
     The holding portions  25  and  26  connect a plurality of second leads  20 . The holding portion  25  is formed continuously with the second N-side electrode terminal  21 , and the holding portion  26  is formed continuously with the second P-side electrode terminal  22 . These holding portions  25  and  26  extend toward the exterior of the second lead  20  in a planar view. The holding portions  25  and  26  have front surfaces thereof half-etched and the second molded body  62  is provided in the half-etched portions. This makes the first lead  10  more strongly bonded to the second lead  20 . The rear surfaces of the holding portions  25  and  26  are exposed from the second molded body  62 . 
     Here, the holding portions  25  and  26  are described as portions other than the second N-side electrode terminal  21  and the second P-side electrode terminal  22 , respectively. The holding portions  25  and  26 , however, may be included in the second N-side electrode terminal  21  and the second P-side electrode terminal  22 , respectively. 
     The holding portion  25  that is continuous with the second N-side electrode terminal  21  overlaps the holding portion  15  that is continuous with the first N-side electrode terminal  11  in a planar view, and these holding portions are bonded to each other by direct bonding. The holding portion  26  that is continuous with the second P-side electrode terminal  22  overlaps the holding portion  16  that is continuous with the first P-side electrode terminal  12  in a planar view, and these holding portions are bonded to each other by direct bonding. 
     A material for the first lead  10  and the second lead  20  is, for example, copper, a copper alloy, iron, or an iron alloy. 
     Plating may be performed on the first N-side electrode terminal  11 , the first P-side electrode terminal  12 , the heat dissipation terminal  13 , the second N-side electrode terminal  21 , the second P-side electrode terminal  22 , and the holding portions  15 ,  16 ,  17 ,  25 , and  26 . That is, the first lead  10  and the second lead  20  may be plated. Particularly, the second lead  20  positioned on an upper surface side of the package  1  is preferably plated. The plating is capable of increasing the reflectivity of light from the light emitting element  2 . 
     Examples of the plating include gold, silver, copper, platinum, and an alloy containing one of these metals. The plating with these metals is capable of increasing the reflectivity of light from the light emitting element  2 . 
     The first molded body  61  is a member holding the first lead  10 . The first molded body  61  is formed at the same thickness as the first lead  10 . The second molded body  62  is a member holding the second lead  20 . The second molded body  62  is formed at the same thickness as the second lead  20 . 
     A material for the first molded body  61  and the second molded body  62  is, for example, a thermoplastic resin or a thermosetting resin. For the thermoplastic resin, it is possible to use, for example, a polyphthalamide resin, a liquid crystal polymer, polybutylene terephthalate (PBT), or unsaturated polyester. For the thermosetting resin, it is possible to use, for example, an epoxy resin, a modified epoxy resin, a silicone resin, or a modified silicone resin. 
     Light Emitting Device 
     Next, the light emitting device  100  is described. 
     The light emitting device  100  includes the package  1 , the light emitting element  2 , underfill  3 , a frame body  4 , and a covering member  5 . The light emitting device  100  that includes the package  1  is capable of improving the bonding strength between the leads. The package  1  is as described above and is not described here. 
     Light Emitting Element 
     The light emitting element includes two N-side electrodes  71  and one P-side electrode  72  formed between the two N-side electrodes  71 . 
     The light emitting element  2  has the two N-side electrodes  71  thereof connected to two N-side terminal branched portions  23  of the second lead  20 , respectively, and has the one P-side electrode  72  thereof connected to the P-side terminal branched portion  24  of the second lead  20 . This allows the light emitting element  2  to be mounted on the second lead  20  of the package  1 . The light emitting element  2  used here is not particularly limited in terms of its shape or size. As a light emission color of the light emitting element  2 , it is possible to select any wavelength according to the use application of the light emitting device. For example, as a blue (light with a wavelength of 430 to 490 nm) light emitting element  2 , it is possible to use a GaN material or an InGaN material. As the InGaN material, it is possible to use In X Al Y Ga 1-X-Y N (0≤X≤1, 0≤Y≤1, and X+Y≤1). 
     Underfill 
     The underfill  3  is a member that absorbs stress caused by the difference in coefficient of thermal expansion between the light emitting element  2  and the package  1  and increases the heat releasing property. 
     The underfill  3  is formed in a gap between the package  1  and the light emitting element  2 . A material for the underfill  3  is, for example, a thermosetting resin such as a silicone resin or an epoxy resin. Using, as the material for the underfill  3 , a light reflective member such as a white resin is capable of reflecting light emitted from the light emitting element  2  toward the package  1  to increase the flux of light. 
     Frame Body 
     The frame body  4  is a member constituting a wall portion of the light emitting device  100 . The frame body  4  may be formed on the package  1  to surround the light emitting element  2  or may be formed on the package  1  before the light emitting element  2  is mounted. 
     It is possible to form the frame body  4  by, for example, a thermoplastic resin, a thermosetting resin, a modified resin of these resins, or a hybrid resin containing at least one of these resins. Examples of the thermoplastic resin include a polyamide resin, a polyphthalamide resin, a polycarbonate resin, a polyphenylene sulfide resin, an ABS resin, an acrylic resin, a polybutylene terephthalate resin, a polyethylene terephthalate resin, a polycyclohexane terephthalate resin, and a liquid crystal polymer. Examples of the thermosetting resin include an epoxy resin, a silicone resin, a urea resin, a phenolic resin, a BT resin, a polyimide resin, and a polyurethane resin. These base materials may contain, for example, a coloring agent, a filler, reinforcement fiber, or a fluorescent substance that is known in this field. Particularly, as the coloring agent, a material excellent in reflectivity is preferable, and a white material such as titanium oxide or zinc oxide is preferable. Examples of the filler include silica and alumina. Examples of the reinforcement fiber include glass, calcium silicate, and potassium titanate. 
     Covering Member 
     The covering member  5  is a member covering the light emitting element  2 . 
     The covering member  5  is formed in the frame body  4  on the package  1  to cover the light emitting element  2 . The covering member  5  is provided to protect the light emitting element  2  from, for example, external force, dust, and moisture and to improve the heat resistance, the weather resistance, and the light stability of the light emitting element  2 . A material for the covering member  5  is a thermosetting resin, for example, a transparent material such as a silicone resin, an epoxy resin, or a urea resin. It is possible to add to these materials a fluorescent material or a filler such as a high-light-reflectivity substance, for making the covering member have a prescribed function. 
     The covering member  5  having, for example, a fluorescent material mixed therein is capable of facilitating the color adjustment of the light emitting device  100 . As the fluorescent material, it is possible to use a material that has a specific gravity larger than the specific gravity of the covering member  5 , absorbs light from the light emitting element  2 , and converts the wavelength of the light. The fluorescent material having a specific gravity larger than the specific gravity of the covering member  5  preferably settles on a package  1  side of the covering member. Specific examples of the fluorescent material include yellow fluorescent materials such as YAG (Y 3 Al 5 O 12 :Ce) and silicate, red fluorescent materials such as CASN (CaAlSiN 3 :Eu) and KSF (K 2 SiF 6 :Mn), and green fluorescent materials such as chlorosilicate and BaSiO 4 :Eu 2+ . 
     As the filler added to the covering member  5 , it is possible to suitably use, for example, a high-light-reflectivity substance such as SiO 2 , TiO 2 , Al 2   0   3 , ZrO 2 , or MgO. It is also possible to use, for example, an organic or inorganic coloring dye or coloring pigment for the purpose of cutting a wavelength other than a desired wavelength. 
     Method of Manufacturing Package 
     Next described is one exemplary method of manufacturing the package according to the first embodiment. 
       FIG.  5 A  is a schematic sectional view illustrating a step of forming the first molded body on the first lead in the method of manufacturing the package according to the first embodiment.  FIG.  5 B  is a schematic sectional view illustrating a step of forming the second molded body on the second lead in the method of manufacturing the package according to the first embodiment.  FIGS.  5 A and  5 B  schematically illustrate one package of a plurality of packages manufactured simultaneously. 
     The method of manufacturing the package includes the steps of: preparing a first lead and a second lead, pressing, and forming a second molded body, and these steps are performed in this order. The materials, the disposition, and the like of the members are as described above in the package  1  and are not described here for convenience. 
     Preparing First Lead and Second Lead 
     The preparing a first lead and a second lead is preparing the first lead  10  provided with the first molded body  61  and the second lead  20 . 
     In this step, first prepared are the first lead  10  having a prescribed wiring pattern and the second lead  20  having a prescribed wiring pattern. In the preparation, the prescribed positions are half-etched using a mask. In addition, plating is performed as necessary on surfaces of the first lead and the second lead that are not to be bonded. 
     Next, the first molded body  61  is formed on the first lead  10 . For the formation of the first molded body  61 , first, the first lead  10  is sandwiched between an upper mold  81  and a lower mold  82 , and a resin is injected between the molds. Next, the resin injected between the molds is cured to form the first molded body  61 . Thereafter, burr is removed to arrange the shape of the first molded body. 
     Pressing 
     The pressing is pressing the first lead  10  and the second lead  20  to bond them to each other by direct bonding at the prescribed portions. The pressing is also pressing the first lead  10  and the second lead  20  to space them apart from each other at the prescribed portions. 
     In this pressing, the first N-side electrode terminal  11  is bonded to the second N-side electrode terminal  21  and the first P-side electrode terminal  12  is bonded to the second P-side electrode terminal  22  by direct bonding, with the second lead  20  disposed on the first lead  10 . 
     Also in this pressing, the pressing is performed to space the heat dissipation terminal  13  apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24 , with the second lead  20  disposed on the first lead  10 . 
     In this step, the first lead  10  and the second lead  20  are sandwiched between the upper mold  81  and the lower mold  82 , with the second lead  20  disposed on the first lead  10 . Then, the first lead and the second lead are pressed with the upper mold  81  and the lower mold  82  to bond the first N-side electrode terminal  11  to the second N-side electrode terminal  21  and bond the first P-side electrode terminal  12  to the second P-side electrode terminal  22  by direct bonding. Also, the first lead and the second lead are pressed with the upper mold  81  and the lower mold  82  to space the heat dissipation terminal  13  apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24 . 
     The direct bonding is preferably diffusion bonding. The diffusion bonding is capable of integrating the bonded portions, without melting the base materials themselves. In addition, the diffusion bonding makes the bonded portions less likely to be peeled in processing after the bonding. 
     The conditions for the diffusion bonding is, for example, pressing in vacuum or inert gas at a temperature of 150° C. or higher and 190° C. or lower and a pressure of 90 MPa or more and 180 MPa or less. 
     Forming Second Molded Body 
     The forming a second molded body is forming the second molded body  62  holding the second lead  20 . 
     In this step, the first lead  10  and the second lead  20  are sandwiched between the upper mold  81  and the lower mold  82 , and a resin is injected between the molds. Next, the resin injected between the molds is cured to form the second molded body  62 . Thereafter, burr is removed to arrange the shape of the first molded body. 
     Method of Manufacturing Light Emitting Device 
     Next described is one exemplary method of manufacturing the light emitting device  100  according to the first embodiment. 
       FIG.  6 A  is a schematic sectional view illustrating a step of mounting the light emitting element in the method of manufacturing the light emitting device according to the first embodiment.  FIG.  6 B  is a schematic sectional view illustrating a step of forming the underfill in the method of manufacturing the light emitting device according to the first embodiment.  FIG.  6 C  is a schematic sectional view illustrating a step of forming the frame body in the method of manufacturing the light emitting device according to the first embodiment.  FIG.  6 D  is a schematic sectional view illustrating a step of forming the covering member in the method of manufacturing the light emitting device according to the first embodiment.  FIGS.  6 A to  6 D  schematically illustrate one light emitting device  100  of a plurality of light emitting devices  100  manufactured simultaneously. 
     The method of manufacturing the light emitting device includes the steps of: mounting a light emitting element, forming underfill, forming a frame body, forming a covering member, and division into pieces, and these steps are performed in this order. The materials, the disposition, and the like of the members are as described above in the light emitting device  100  and are not described here for convenience. 
     Mounting Light Emitting Element 
     The mounting a light emitting element is mounting the light emitting element  2  on the package  1  manufactured by the manufacturing method described above. 
     In this step, the N-side electrode  71  of the light emitting element  2  is bonded to the N-side terminal branched portion  23  of the second lead  20  and the P-side electrode  72  of the light emitting element  2  is bonded to the P-side terminal branched portion  24  of the second lead  20 . The bonding may be performed using, for example, a solder paste. 
     Forming Underfill 
     The forming underfill is forming the underfill  3  in the gap between the package  1  and the light emitting element  2 . 
     The formation of the underfill  3  is performed by first injecting a material for the underfill  3  between the package  1  and the light emitting element  2  to fill the gap generated between the package  1  and the light emitting element  2 . Next, the injected material for the underfill  3  is thermally cured. This forms the underfill  3  between the package  1  and the light emitting element  2 . The underfill  3  infiltrates between the package  1  and the light emitting element  2  to have a shape of widening toward the end. The formation of the underfill  3  may also be performed by disposing the material for the underfill  3  on the package  1  before mounting the light emitting element  2  and thermally curing the material after mounting the light emitting element  2 . 
     Forming Frame Body 
     The forming a frame body is forming the frame body  4  to surround the light emitting element  2 . 
     It is possible to form the frame body  4  by, for example, using a discharge device (dispenser) capable of moving (movable) vertically or horizontally with respect to the second lead  20  above the second lead  20  fixed. 
     Forming Covering Member 
     The forming a covering member is forming the covering member  5  in the frame body  4 . 
     It is possible to form the covering member  5  by applying the covering member  5  in the frame body  4 . It is also possible to form the covering member  5  by, for example, injection, compression, or extrusion. 
     Division into Pieces 
     The division into pieces is cutting and dividing an aggregate of light emitting devices  100  into pieces. 
     In this step, a plurality of packages  1  connected to each other by the holding portions  15 ,  16 , and  17  of the first lead  10  and the holding portions  25  and  26  of the second lead  20  are divided into pieces by cutting the aggregate at the holding portions  15 ,  16 ,  17 ,  25 , and  26 . 
     It is possible to divide the aggregate into pieces by a conventionally known method such as a dicing method of performing cutting with a blade. 
     Second Embodiment 
       FIG.  7 A  is a schematic sectional view illustrating a configuration of a package and a light emitting device according to a second embodiment and corresponding to the schematic sectional view taken along the line IIA-IIA in  FIG.  1 B .  FIG.  7 B  is a schematic sectional view illustrating the configuration of the package and the light emitting device according to the second embodiment and corresponding to the schematic sectional view taken along the line IIB-IIB in  FIG.  1 B . 
     Package and Light Emitting Device 
     A package  1 A includes the first lead  10 , the second lead  20 , and a molded body  6 . 
     A light emitting device  100 A includes the package  1 A, the light emitting element  2 , the underfill  3 , the frame body  4 , and the covering member  5 . 
     In the light emitting device  100 A according to the second embodiment, the molded body  6  of the first lead  10  and the molded body  6  of the second lead  20  in the package  1 A integrally form one molded body  6 . The molded body  6  holds the first lead  10  and the second lead  20 . The configurations other than the configuration described above are the same as the light emitting device  100  according to the first embodiment. 
     Method of Manufacturing Package 
     Next described is one exemplary method of manufacturing the package according to the second embodiment. 
       FIG.  8 A  is a schematic sectional view illustrating a state in which the second lead is disposed on the first lead in the method of manufacturing the package according to the second embodiment.  FIG.  8 B  is a schematic sectional view illustrating a step of forming the molded body on the first lead and the second lead in the method of manufacturing the package according to the second embodiment.  FIGS.  8 A and  8 B  schematically illustrate one package of a plurality of packages manufactured simultaneously. 
     The method of manufacturing the package includes the steps of: preparing a first lead and a second lead, pressing, and forming a molded body, and these steps are performed in this order. The materials, the disposition, and the like of the members are as described above in the package  1  and are not described here for convenience. 
     Preparing First Lead and Second Lead 
     In the method of manufacturing the package according to the first embodiment, the first molded body  61  is formed on the first lead  10 . In the method of manufacturing the package according to the second embodiment, however, the first molded body  61  is not formed on the first lead  10 . The procedures other than the procedure described above are the same as the method of manufacturing the package according to the first embodiment. 
     Pressing 
     The pressing is the same as the pressing in the method of manufacturing the package according to the first embodiment. 
     Forming Molded Body 
     The forming a molded body is forming the molded body  6  holding the first lead  10  and the second lead  20 . 
     In this step, the first lead  10  and the second lead  20  are sandwiched between the upper mold  81  and the lower mold  82 , and a resin is injected between the molds. Next, the resin injected between the molds is cured to form the molded body  6 . Thereafter, burr is removed to arrange the shape of the first molded body. 
     Method of Manufacturing Light Emitting Device 
     Next described is one exemplary method of manufacturing the light emitting device according to the second embodiment. 
     The method of manufacturing the light emitting device  100 A is the same as the method of manufacturing the light emitting device  100  according to the first embodiment except for using the package lA that has the molded body  6  of the first lead  10  and the molded body  6  of the second lead  20  integrally formed therein. 
     Other Embodiments 
       FIG.  9 A  is a schematic sectional view illustrating a configuration of a light emitting device according to another embodiment and corresponding to the schematic sectional view taken along the line IIA-IIA in  FIG.  1 B .  FIG.  9 B  is a schematic sectional view illustrating a configuration of a light emitting device according to another embodiment and corresponding to the schematic sectional view taken along the line IIB-IIB in  FIG.  1 B .  FIG.  10    is a schematic plan view illustrating a configuration of a light emitting device according to another embodiment.  FIG.  11 A  is a schematic plan view illustrating a configuration of a second lead according to another embodiment.  FIG.  11 B  is a schematic plan view illustrating a configuration of a light emitting device according to another embodiment.  FIG.  12 A  is a schematic sectional view illustrating a step of forming a sheet member in a method of manufacturing a light emitting device according to another embodiment.  FIG.  12 B  is a schematic sectional view illustrating a step of forming a side wall member in a method of manufacturing a light emitting device according to another embodiment. 
     In a light emitting device  100 B shown in  FIG.  9 A , a recess portion is not provided on the heat dissipation terminal  13  of a first lead  10 B in a package  1 B. Further, the N-side terminal branched portion  23  and the P-side terminal branched portion  24  of a second lead  20 B in the package  1 B are bent along the thickness of the portions. With such a configuration, the heat dissipation terminal  13  may be spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24 . 
     In a light emitting device  100 C shown in  FIG.  9 B , the heat dissipation terminal  13  of a first lead  10 C in a package  1 C is curved in a recess shape along the thickness of the heat dissipation terminal to form a curved portion  13   c . With such a configuration, the heat dissipation terminal  13  may be spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24 . 
     Alternatively, the heat dissipation terminal  13  may be spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24  by providing a recess portion on the N-side terminal branched portion  23  and the P-side terminal branched portion  24 , curving the N-side terminal branched portion  23  and the P-side terminal branched portion  24  in a recess shape, or bending the heat dissipation terminal  13 . Further, the heat dissipation terminal  13  may be spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24  by providing a recess portion on all of the heat dissipation terminal  13 , the N-side terminal branched portion  23 , and the P-side terminal branched portion  24 , curving all of the heat dissipation terminal  13 , the N-side terminal branched portion  23 , and the P-side terminal branched portion  24  in a recess shape, or bending all of the heat dissipation terminal  13 , the N-side terminal branched portion  23 , and the P-side terminal branched portion  24 . 
     Like a light emitting device  100 D shown in  FIG.  10   , the light emitting element may be a light emitting element  2 D having a hexagonal shape in a planar view. Use of the light emitting element  2 D having a hexagonal shape in a planar view decreases the distance from a side surface of the light emitting element  2 D to the frame body  4  to improve the light extraction efficiency. The light emitting element may have a polygonal shape other than the hexagonal shape in a planar view. 
     As shown in  FIG.  11 A , the second lead may be a second lead  20 E that includes two P-side terminal branched portions  24 , with the two P-side terminal branched portions  24  disposed between the two N-side terminal branched portions  23 . As shown in  FIG.  11 B , the light emitting device may be a light emitting device  100 E obtained by preparing two light emitting elements  2 E each having one N-side electrode  71  and one P-side electrode  72 , and mounting the two light emitting elements  2 E on the second lead  20 E. 
     As shown in  FIG.  12 B , the light emitting device may be a light emitting device  100 F including a sheet member  7  disposed on an upper surface of the light emitting element  2 , and a side wall member  8  disposed on a side surface of the sheet member  7 , a side surface of the light emitting element  2 , and a side surface of the underfill  3 . 
     As a material for the sheet member  7 , it is possible to use the same material as the covering member  5 . It is possible to add to the sheet member  7  a fluorescent material or a filler such as a high-light-reflectivity substance. As a material for the side wall member  8 , it is possible to use the same material as the frame body  4 . 
     It is possible to perform a method of manufacturing the light emitting device  100 F, for example, as described below after the forming the underfill  3 . 
     First, the sheet member  7  having a prescribed size is attached to the upper surface of the light emitting element  2  with, for example, an adhesive resin (forming a sheet member). Next, the side wall member  8  is applied to lateral side surfaces of, for example, the light emitting element  2  (forming a side wall member). Thereafter, an aggregate of light emitting devices  100 F is cut and divided into pieces. The procedures other than the procedures described above are the same as the method of manufacturing the light emitting device  100  according to the first embodiment. 
     The heat dissipation terminal  13  is not necessarily disposed. 
     A part of the first molded body  61  or the molded body  6  is not necessarily provided between the heat dissipation terminal  13  and both the N-side terminal branched portion  23  and the P-side terminal branched portion  24 . 
     As long as the heat dissipation terminal  13  is spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24 , the direct bonding is not necessarily performed between the first N-side electrode terminal  11  and the second N-side electrode terminal  21  and between the first P-side electrode terminal  12  and the second P-side electrode terminal  22 . 
     With the heat dissipation terminal  13  spaced apart from the N-side terminal branched portion  23  and the P-side terminal branched portion  24 , it is possible to form different electrode patterns between the front surface and the rear surface of the package as described above. Accordingly, the package  1  has high flexibility of designing. 
     Accordingly, in this case, the bonding may be performed with another member such as an adhesive agent between the first N-side electrode terminal  11  and the second N-side electrode terminal  21  and between the first P-side electrode terminal  12  and the second P-side electrode terminal  22 . 
     In this case, the method of manufacturing a package includes pressing that is performed to bond the first lead  10  to the second lead  20  with another member such as an adhesive agent at the first N-side electrode terminal  11  and the second N-side electrode terminal  21  and at the first P-side electrode terminal  12  and the second P-side electrode terminal  22 , with the second lead  20  disposed on the first lead  10 . 
     As described above, the packages and the light emitting devices according to the present embodiments and the methods of manufacturing them have been specifically described by way of DESCRIPTION OF THE EMBODIMENTS. The subject matter of the present invention is, however, not to be limited to this description but is to be widely interpreted on the basis of the description of claims. Various changes, modifications, and the like based on this description are included in the subject matter of the present invention. 
     For example, the method of manufacturing a package and the method of manufacturing a light emitting device may include an additional step between steps, or before or after a step of the above-mentioned steps as long as the additional step does not adversely affect each of the steps. For example, the methods may include a foreign matter removal step of removing foreign matter mixed during manufacturing. 
     Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.