Abstract:
A method for manufacturing a circuit board constituted by a light emitting device and a mounting board includes the steps of: conveying the light emitting device onto the mounting board in a state in which a top face is chucked by a nozzle so that the nozzle and an exposed part of a first terminal part of the light emitting device are in contact; and placing the light emitting device onto the mounting board so that the first terminal part and a wiring component are in contact in a state in which the top face is chucked by the nozzle.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This is a continuation application of U.S. patent application Ser. No. 13/291,841 filed on Nov. 8, 2011. This application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2010-253321, filed on Nov. 11, 2011. The entire disclosures of U.S. patent application Ser. No. 13/291,841 and Japanese Patent Applications No. 2010-253321 are hereby incorporated herein by reference. 
     
    
     BACKGROUND 
       [0002]    1. Technical Field 
         [0003]    The present invention relates to a light emitting device comprising a light emitting element, and to a circuit board comprising this light emitting device and a mounting board. 
         [0004]    2. Background Information Light emitting devices comprising a light emitting element (such as a light emitting diode or a laser diode) have been widely used in the past as the light source for LCD television backlights, lighting fixtures, optical communications devices, and so forth. 
         [0005]    Light emitting devices are generally classified as either a top-view type or a side-view type, according to the direction in which the light emitted by the light emitting element is taken off. With a top-view type of light emitting device, the emitted light from a light emitting element  10  is taken off in a direction perpendicular to the mounting face. With a side-view type of light emitting device, the emitted light from the light emitting element is taken off in a direction that is parallel to the mounting face. 
         [0006]    With a light emitting device such as this, the top face of the light emitting device is chucked and conveyed onto the mounting board by a nozzle of the device that mounts the light emitting device, and is then mounted on the mounting face of the mounting board. 
         [0007]    In Japanese Laid-Open Patent Application 2010-62272 (hereinafter referred to as the “Patent Literature 1”), there is also a known light emitting device manufactured by cutting a lead frame and a molded article that is integrally molded with the lead frame, in order to manufacture many light emitting devices in a short time and increase production efficiency. The light emitting device in Patent Literature 1 has a substantially cuboid shape, and has a bottom face that abuts the mounting face, a top face that is the light emission face opposite the bottom face, and four side faces that are contiguous with the bottom face and the top face. The light emitting device in Patent Literature 1 has a pair of flat leads embedded in the molded article. One of the flat leads has a face on which a light emitting element is placed on the top face side, and the other flat lead has a face that is electrically connected to the light emitting element on the top face side. The bottom face side of the pair of flat leads had by the light emitting device in Patent Literature 1 is exposed from the bottom face of the light emitting device over a large enough area to allow a good solder bond. Therefore, the light emitting device in Patent Literature 1 is a top-view type of light emitting device that has a terminal on the bottom face and has a light emission face on the top face. 
       SUMMARY 
       [0008]    For example, when a substantially cuboid light emitting device having a bottom face, a top face that is opposite the bottom face, and four side faces that are contiguous with the bottom face and the top face is used as a side-view type of light emitting device, it is necessary for the bottom face where the terminal is provided to abut the mounting face, and to provide the light emission face on a side face. The flat leads having a face on which a light emitting element is placed and a face that is electrically connected to the light emitting element are disposed substantially parallel to the light emission face, that is, substantially parallel to a side face, and are embedded in the molded article. That is, the thickness portion of the lead with a smaller surface area (that is, the side face of the flat lead) faces the top face of the light emitting device. In mounting the light emitting device to a mounting board with a nozzle, the top face of the light emitting device is chucked by the nozzle, and pressure is applied from the top face toward the interior of the package. 
         [0009]    With a top-view type of light emitting device, the molded article of the top face is sandwiched between the flat lead disposed parallel to the top face and the nozzle, whereas with a side-view type of light emitting device, the molded article of the top face is sandwiched between the thickness portion of the flat lead disposed parallel to the side face and the nozzle. Since the surface area of the top face of a side-view type of light emitting device is larger than the surface area of the lead touching the molded article of the top face, the surface area of the molded article not sandwiched between the lead and the nozzle is large. Therefore, the molded article of the top face readily bends under pressing force from the nozzle, making the molded article of the top face susceptible to cracking. This ends up lowering the yield. 
         [0010]    The technology disclosed herein was conceived in light of the above situation, and it is an object thereof to provide a side-view type of light emitting device with which the yield is increased by reducing cracking of the top face when pressure is applied from the top face side toward the interior of the package. 
         [0011]    A method according to one aspect is a method for manufacturing a circuit board constituted by a light emitting device and a mounting board, the light emitting device comprising a light emitting element and a package, the package constituted by a molded article and at least a first lead and a second lead embedded in the molded article, the package having a bottom face, a top face disposed opposite to the bottom face and a light emission face connected to the bottom face and the top face, the first lead and the second lead electrically connected with the light emitting element, the first lead including a first terminal part exposed at the bottom face and an exposed part exposed at the top face, and the exposed part provided more toward the center of the package than the first terminal part, the mounting board comprising a wiring component connected to the first terminal part. The method includes the steps of: conveying the light emitting device onto the mounting board in a state in which the top face is chucked by the nozzle so that the nozzle and the exposed part are in contact; and placing the light emitting device onto the mounting board so that the first terminal part and the wiring component are in contact in a state in which the top face is chucked by the nozzle. 
         [0012]    The technology disclosed herein provides a side-view type of light emitting device with which the top face is supported by a first exposed part when pressure is applied from the top face side toward the interior of the package, making bending less likely toward the interior of the package, so cracking can be reduced on the top face, and the yield can be increased. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0013]      FIG. 1  is an oblique view of a light emitting device  100  pertaining to a first embodiment, as seen from the front; 
           [0014]      FIG. 2  is an oblique view of the light emitting device  100  pertaining to the first embodiment, as seen from the rear; 
           [0015]      FIG. 3  is a see-through view of  FIG. 1 ; 
           [0016]      FIG. 4  is a see-through view of  FIG. 2 ; 
           [0017]      FIG. 5  is a plan view of a bottom face  20 A of the light emitting device  100  pertaining to the first embodiment; 
           [0018]      FIG. 6  is an oblique view of the mounting face of a mounting board  200  pertaining to the first embodiment; 
           [0019]      FIG. 7  is an oblique view of the mounting face of a circuit board  300  pertaining to the first embodiment; 
           [0020]      FIG. 8A  is a diagram illustrating a method for manufacturing the circuit board  300  pertaining to the first embodiment; 
           [0021]      FIG. 8B  is a diagram illustrating a method for manufacturing the circuit board  300  pertaining to the first embodiment; 
           [0022]      FIG. 9A  is a diagram illustrating a method for manufacturing the light emitting device  100  pertaining to the first embodiment; 
           [0023]      FIG. 9B  is a diagram illustrating a method for manufacturing the light emitting device  100  pertaining to the first embodiment; 
           [0024]      FIG. 10A  is a diagram illustrating a method for manufacturing the light emitting device  100  pertaining to the first embodiment; 
           [0025]      FIG. 10B  is a diagram illustrating a method for manufacturing the light emitting device  100  pertaining to the first embodiment; 
           [0026]      FIG. 11  is a detail view of a lead frame  45  pertaining to the first embodiment; 
           [0027]      FIG. 12  is a cross section along the A-A line in  FIG. 11 ; 
           [0028]      FIG. 13  is a diagram illustrating a method for manufacturing the light emitting device  100  pertaining to the first embodiment; 
           [0029]      FIG. 14  is an oblique see-through view of a light emitting device  100 A pertaining to a second embodiment, as seen from the front; 
           [0030]      FIG. 15  is an oblique see-through view of the light emitting device  100 A pertaining to the second embodiment, as seen from the rear; 
           [0031]      FIG. 16  is an oblique see-through view of a light emitting device  100  pertaining to a third embodiment, as seen from the rear; 
           [0032]      FIG. 17  is a diagram illustrating a method for manufacturing the light emitting device  100  pertaining to the third embodiment; 
           [0033]      FIG. 18  is a detail view of a lead frame  45 C pertaining to the third embodiment; and 
           [0034]      FIG. 19  is a diagram illustrating a method for manufacturing the light emitting device  100  pertaining to the third embodiment. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0035]    Embodiments of the present invention will now be described through reference to the drawings. In the discussion of the drawings below, portions that are the same or similar will be given the same or similar numbers. The drawings, however, are merely representations, and the proportions of the various dimensions may vary from those in actuality. Therefore, specific dimensions and so forth should be decided on by referring to the following description. Also, the dimensional relations and proportions of some portions may, of course, vary from one drawing to the next. 
       First Embodiment 
     Summary of First Embodiment 
       [0036]    In the first embodiment, we will describe a side-view type of light emitting device in which the top face is supported by a first exposed part when pressure is applied from the top face side toward the interior of the package, and bending toward the interior of the package is less apt to occur, so cracking is less likely to occur in the top face and the yield can be increased. More specifically, the light emitting device has a package constituted by a molded article and leads embedded in the molded article, and the each lead has a terminal part exposed at the bottom face, and an exposed part that is exposed at the top face. 
         [0037]    The configuration of the light emitting device, mounting board, and circuit board, and the method for manufacturing the light emitting device, will now be described in order. 
       Configuration of Light Emitting Device 
       [0038]    The configuration of the light emitting device pertaining to the first embodiment will be described through reference to the drawings.  FIG. 1  is an oblique view of a light emitting device  100  pertaining to the first embodiment, as seen from the front.  FIG. 2  is an oblique view of a light emitting device  100  pertaining to the first embodiment, as seen from the rear. 
         [0039]    The light emitting device  100  comprises a light emitting element  10  and a package  20 . The light emitting device  100  pertaining to this embodiment is what is known as a side-view type of light emitting device, and light emitted from the light emitting element  10  is taken off in a direction parallel to a mounting face  200 A (see  FIG. 6 ) of a mounting board  200  (discussed below). 
         [0040]    In this embodiment, the light emitting device  100  has a substantially cuboid shape that extends along a first direction parallel to the mounting face  200 A. In this embodiment, the size of the light emitting device  100  is approximately 3 mm in the first direction, about 1 mm in a direction parallel to the mounting face  200 A and perpendicular to the first direction (hereinafter referred to as the “second direction”), and about 1 mm in a direction perpendicular to the first direction and the second direction (that is, a direction perpendicular to the mounting face  200 A; hereinafter referred to as the “third direction”). The size of the light emitting device  100  is not limited to this, however. 
         [0041]    The light emitting device  100  pertaining to this embodiment is a side-view type, and the ratio of the height in the third direction to the depth in the second direction is greater than that of a top-view type. Specifically, a side-view type is taller than a top-view type. Accordingly, the light emitting device  100  pertaining to this embodiment is characterized by a tendency to topple. 
         [0042]    Light Emitting Element  10   
         [0043]    The light emitting element  10  is placed in the package  20 . The light emitting element  10  is electrically connected to the package  20  via a first wire  11  and a second wire  12 . 
         [0044]    The light emitting element  10  is formed in a flat shape, and is disposed perpendicular to the second direction. The emitted light from the light emitting element  10  is taken off in a direction parallel to the second direction, from a front face opening  20 F (discussed below). 
         [0045]    The light emitting element  10  is a semiconductor light emitting element called a light emitting diode, for example. The light emitting element  10  preferably has as its light emitting layer a semiconductor such as GaAlN, ZnS, SnSe, SiC, GaP, GaAlAs, AlN, InN, AlInGaP, InGaN, GaN, or AlInGaN on a substrate, but is not limited to this. 
         [0046]    A face-up structure or a face-down structure can be employed for the light emitting element  10 . There are no particular restrictions on the size of the light emitting element  10 , but examples include 350 μm square, 500 μm square, and 1 mm square. 
         [0047]    Package  20   
         [0048]    In this embodiment, the package  20  has a substantially cuboid shape that extends in the first direction. The package  20  has a bottom face  20 A, a top face  20 B, a front face  20 C, a rear face  20 D, a first side face  20 E 1 , and a second side face  20 E 2 . 
         [0049]    The bottom face  20 A hits the mounting face  200 A (see  FIG. 9 ) when the light emitting device  100  is mounted. The top face  20 B is provided opposite the bottom face  20 A. The front face  20 C is a light emission face that is contiguous with the bottom face  20 A and the top face  20 B. The front face  20 C has the front face opening  20 F. The front face opening  20 F guides the light emitted from the light emitting element  10  to outside the package  20 . The light emitting element  10  is placed on a first connection face  41 A (see  FIG. 3 ) exposed in the interior of the front face opening  20 F. The rear face  20 D is contiguous with the bottom face  20 A and the top face  20 B, and is provided opposite the front face  20 C. The rear face  20 D is perpendicular to the second direction. The boundary between the rear face  20 D and the bottom face  20 A is parallel to the first direction. The first side face  20 E 1  is contiguous with the rear face  20 D and the front face  20 C. The second side face  20 E 2  is provided opposite the first side face  20 E 1 . The first side face  20 E 1  and the second side face  20 E 2  are perpendicular to the first direction. 
         [0050]    The package  20  is made up of a molded article  30 , a first lead  40 , a second lead  50 , and a sealing resin  60 . 
         [0051]    (1) Molded Article  30   
         [0052]    The molded article  30  forms the outer shape of the package  20 . The molded article  30  is heat resistant and has the required strength, and is made of an electrically insulating material that does not readily transmit outside light, the light emitted from the light emitting element  10 , or other such light. A favorable example of this material is a triazine derivative epoxy resin, which is a thermosetting resin. This thermosetting resin may contain an acid anhydride, an antioxidant, a parting agent, a light reflecting member, an inorganic filler, a curing catalyst, a light stabilizer, and a lubricant. Titanium dioxide, added in an amount of 0 to 90 wt %, and preferably 10 to 60 wt %, can be used as the light reflecting member. The material of the molded article  30  is not limited to this, however, and can be, for example, one or more types of thermosetting resin selected from among epoxy resins, modified epoxy resins, silicone resins, modified silicone resins, acrylate resins, and urethane resins. Epoxy resins, modified epoxy resins, silicone resins, and modified silicone resins are particularly favorable as the material for the molded article  30 . A thermoplastic resin may also be used, such as a liquid crystal polymer, a polyphthalamide resin, or polybutylene terephthalate (PBT). 
         [0053]    (2) First Lead  40  and Second Lead  50   
         [0054]    The first lead  40  and the second lead  50  are preferably made of a material having a relatively high thermal conductivity (such as at least about 200 W/(m·K)). This allows any heat generated from the light emitting element  10  to be efficiently transmitted. Examples of such a material include one or more layers of nickel, gold, copper, silver, molybdenum, tungsten, aluminum, iron, or another such metal, or of an iron-nickel alloy, phosphor bronze, ferrous copper, or another such alloy. The surfaces of the first lead  40  and the second lead  50  may also be plated. 
         [0055]    The majority of the first lead  40  and the second lead  50  is embedded in the molded article  30 , and just parts of the first lead  40  and the second lead  50  are exposed from the molded article  30 . Specifically, just parts of the first lead  40  and the second lead  50  can be seen from the outside of the package  20 . In particular, the first lead  40  and the second lead  50  each have one external electrode that can be seen form the outside of the package  20  (a first terminal part  42  and a second terminal part  52  (see  FIG. 4 ); discussed below). In this embodiment, no external electrodes other than these two can be seen from the outside of the package  20 . The configuration of the first lead  40  and the second lead  50  will be discussed below. 
         [0056]    (3) Sealing Resin  60   
         [0057]    The sealing resin  60  is packed into the interior of the front face opening  20 F, and seals the light emitting element  10 . This sealing resin  60  can be a translucent resin, such as one or more types of resin selected from among polyolefin resins, polycarbonate resins, polystyrene resins, epoxy resins, acrylic resins, acrylate resins, methacrylic resins (PMMA, etc.), urethane resins, polyimide resins, polynorbornene resins, fluororesins, silicone resins, modified silicone resins, and modified epoxy resins. This material may also contain a diffusion agent, filler, pigment, fluorescent substance, etc., as discussed in Japanese Laid-Open Patent Application 2006-229055 and WO2006/038502. 
         [0058]    Lead Configuration 
         [0059]    Next, the configuration of the leads pertaining to the first embodiment will be described through reference to the drawings.  FIG. 3  is a see-through view of  FIG. 1 .  FIG. 4  is a see-through view of  FIG. 2 .  FIG. 5  is a plan view of a bottom face  20 A of the light emitting device  100  pertaining to the first embodiment. In  FIGS. 3 and 4 , the molded article  30  is shown in outline. 
         [0060]    Configuration of First Lead  40   
         [0061]    The first lead  40  is made up of a first connector  41 , the first terminal part  42 , a base part  43 , and a first exposed part  44 . In this embodiment, the first terminal part  42 , the base part  43 , and the first exposed part  44  are integrally linked to the first connector  41 . 
         [0062]    (1) First Connector  41   
         [0063]    The first connector  41  is formed in a flat shape, and is disposed along the rear face  20 D. The first connector  41  has a first connection face  41 A that is exposed from the molded article  30 . The first connection face  41 A is exposed from the molded article  30  in the interior of the front face opening  20 F. The light emitting element  10  is placed in the first connection face  41 A (that is, the first connection face  41 A serves as the placement face where the light emitting element  10  is placed), and the first wire  11  is also connected to the first connection face  41 A. This electrically connects the first connector  41  to the light emitting element  10  (that is, the first connector  41  serves as a placement face where the light emitting element  10  is placed). The first connection face  41 A is sealed by the sealing resin  60  (see  FIG. 1 ). 
         [0064]    (2) First Terminal Part  42   
         [0065]    The first terminal part  42  is formed in a three-dimensional shape, and is linked to the lower end of the first connector  41  on the first side face  20 E 1  side. The first terminal part  42  is exposed from the molded article  30  at the boundary between the bottom face  20 A, the rear face  20 D, and the first side face  20 E 1 , and functions as an external electrode of the light emitting device  100 . The first terminal part  42  has a first end face  42 A, a second end face  42 B, a third end face  42 C, and a first terminal concavity  42 S. 
         [0066]    The first end face  42 A is exposed from the molded article  30  at the rear face  20 D of the package  20 . The first end face  42 A forms part of the rear face  20 D. The second end face  42 B is exposed from the molded article  30  at the first side face  20 E 1  of the package  20 . The second end face  42 B forms part of the first side face  20 E 1 . The third end face  42 C is exposed from the molded article  30  at the bottom face  20 A of the package  20 . The third end face  42 C forms part of the bottom face  20 A. The first terminal concavity  42 S is a cut-out formed at the boundary between the bottom face  20 A, the rear face  20 D, and the first side face  20 E 1 . 
         [0067]    The first terminal concavity  42 S communicates with three faces: the bottom face  20 A, the rear face  20 D, and the first side face  20 E 1 . When the light emitting device  100  is mounted, solder (part of a first solder fillet  301 ; see  FIG. 7 ) is held in the first terminal concavity  42 S. 
         [0068]    (3) Base Part  43   
         [0069]    The base part  43  is lined to the bottom face  20 A side of the first connector  41 , that is, to the lower end of the first connector  41 . The base part  43  is exposed from the molded article  30  at the bottom face  20 A. The base part  43  is the base of the light emitting device  100 , and functions as an “overlap” that makes the light emitting device  100 , which is tall and prone to tipping, less likely to tip over. 
         [0070]    In this embodiment, the base part  43  also functions as a heat sink that releases heat generated from the light emitting element  10 . More specifically, the base part  43  is exposed from the molded article  30  at the bottom face  20 A and the rear face  20 D of the package  20 . As shown in  FIGS. 4 and 5 , the base part  43  has a first exposed face  43 A that is exposed from the molded article  30  at the rear face  20 D, and a second exposed face  43 B that is exposed from the molded article  30  at the bottom face  20 A. The first exposed face  43 A forms part of the rear face  20 D, and the second exposed face  43 B forms part of the bottom face  20 A. When the light emitting device  100  is mounted, the first exposed face  43 A is exposed on the outside of the light emitting device  100 , and the second exposed face  43 B is in contact with the mounting face  200 A (see  FIG. 7 ). 
         [0071]    Also, in this embodiment, the base part  43  has a concavity  43 S that communicates with the bottom face  20 A and the rear face  20 D. The concavity  43 S is a cut-out formed in part of the boundary between the bottom face  20 A and the rear face  20 D. As shown in  FIG. 4 , the concavity  43 S has a first inner wall  43 Sa, a second inner wall  43 Sb, and a third inner wall  43 Sc. The first inner wall  43 Sa is perpendicular to the first direction. The second inner wall  43 Sb is opposite the first inner wall  43 Sa. The third inner wall  43 Sc is perpendicular to the second direction and is contiguous with the first inner wall  43 Sa and the second inner wall  43 Sb. When the light emitting device  100  is mounted, a third solder fillet  303   a  is formed over the first inner wall  43 Sa, and a third solder fillet  303   b  is formed over the second inner wall  43 Sb (see  FIG. 7 ). Meanwhile, when the light emitting device  100  is mounted, the third inner wall  43 Sc is exposed on the outside of the light emitting device  100 . 
         [0072]    (4) First Exposed Part  44   
         [0073]    The first exposed part  44  is linked to the top face  20 B side of the first connector  41 , that is, to the upper end of the first connector  41 . The first exposed part  44  is exposed from the molded article  30  at the top face  20 B and forms part of the top face  20 B. The first exposed part  44  is surrounded by the molded article  30 . The first exposed part  44  is located more toward the center of the package  20  than the first terminal part  42  in the first direction (that is, the width direction of the package  20 ). 
         [0074]    In this embodiment, the first exposed part  44  is formed so as to be opposite the base part  43 , with the first connector  41  in between. 
         [0075]    Configuration of Second Lead  50   
         [0076]    The second lead  50  is made up of a second connector  51 , the second terminal part  52 , and a second exposed part  54 . In this embodiment, the second connector  51 , the second terminal part  52 , and the second exposed part  54  are formed integrally. 
         [0077]    (1) Second Connector  51   
         [0078]    The second connector  51  is formed in a flat shape, and is disposed along the rear face  20 D. The first to third side faces  20 D 1  to  20 D 3  of the second connector  51  are covered by the molded article  30 . Meanwhile, the second connector  51  has a second connection face  51 A that is exposed from the molded article  30 . 
         [0079]    The second connection face  51 A is exposed from the molded article  30  in the interior of the front face opening  20 F. The second wire  12  is connected to the second connection face  51 A. This electrically connects the second connector  51  and the light emitting element  10 . The second connection face  51 A is sealed by the sealing resin  60  (see  FIG. 1 ). 
         [0080]    (2) Second Terminal Part  52   
         [0081]    The second terminal part  52  is formed in a three-dimensional shape, and is linked to the lower end of the second connector  51  on the second side face  20 E 2  side. Part of the second terminal part  52  is exposed from the molded article  30  at the boundary between the bottom face  20 A, the rear face  20 D, and the second side face  20 E 2 , and functions as an external electrode of the light emitting device  100 . The second terminal part  52  has a first end face  52 A, a second end face  52 B, a third end face  52 C, and a second terminal concavity  52 S. 
         [0082]    The first end face  52 A is exposed from the molded article  30  at the rear face  20 D of the package  20 . The first end face  52 A forms part of the rear face  20 D. The second end face  52 B is exposed from the molded article  30  at the second side face  20 E 2  of the package  20 . The second end face  52 B forms part of the second side face  20 E 2 . The third end face  52 C is exposed from the molded article  30  at the bottom face  20 A of the package  20 . The third end face  52 C forms part of the bottom face  20 A. The second terminal concavity  52 S is a cut-out formed at the boundary between the bottom face  20 A, the rear face  20 D, and the second side face  20 E 2 . The second terminal concavity  52 S communicates with three faces: the bottom face  20 A, the rear face  20 D, and the second side face  20 E 2 . When the light emitting device  100  is mounted, solder (part of a second solder fillet; see  FIG. 7 ) is held in the second terminal concavity  52 S. 
         [0083]    (3) Second Exposed Part  54   
         [0084]    The second exposed part  54  is linked to the top face  20 B side of the second connector  51 , that is, to the upper end of the second connector  51 . The second exposed part  54  is exposed from the molded article  30  at the top face  20 B, and forms part of the top face  20 B. The second exposed part  54  is surrounded by the molded article  30 . The second exposed part  54  is located more toward the center of the package  20  than the second terminal part  52  in the first direction (that is, the width direction of the package  20 ). Therefore, the first exposed part  44  and the second exposed part  54  are disposed aligned between the first terminal part  42  and the second terminal part  52 . 
         [0085]    In this embodiment, the second exposed part  54  is formed so as to be opposite the second terminal part  52  with the first connector  41  in between. 
         [0086]    Configuration of Mounting Board 
         [0087]    Next, the configuration of the mounting board pertaining to the first embodiment will be described though reference to the drawings.  FIG. 6  is an oblique view of the mounting face of a mounting board  200  pertaining to the first embodiment. In  FIG. 6 , the region where the light emitting device  100  is mounted is shown as a mounting region  100 R. 
         [0088]    As shown in  FIG. 6 , the mounting board  200  has the mounting face mounting face  200 A, a first land  201 , a second land  202 , a third land  203 , and an electrical circuit  204 . 
         [0089]    The light emitting device  100  is mounted on the mounting face  200 A. The first land  201  is a metal member for connecting the first terminal part  42 . The second land  202  is a metal member for connecting the second terminal part  52 . The third land  203  is a metal member for connecting the base part  43 . Copper foil or the like can be used, for example, as the first to third lands  201  to  203 . The surfaces of the first to third lands  201  to  203  form part of the mounting face  200 A. 
         [0090]    The electrical circuit  204  is connected to the first land  201  and the second land  202 . Consequently, the first land  201  functions as an external terminal corresponding to the first terminal part  42 , and the second land  202  functions as an external terminal corresponding to the second terminal part  52 . Meanwhile, the electrical circuit  204  is not connected to the third land  203 , and is in fact electrically isolated from the third land  203 . Accordingly, the third land  203  does not function as an external terminal, and is a member that is just for providing the third solder fillets  303  (discussed below). 
         [0091]    Configuration of Circuit Board 
         [0092]    Next, the configuration of the circuit board pertaining to the first embodiment will be described through reference to the drawings.  FIG. 7  is an oblique view of the mounting face of a circuit board  300  pertaining to the first embodiment. 
         [0093]    As shown in  FIG. 7 , the circuit board  300  comprises the light emitting device  100 , the mounting board  200 , the first solder fillet  301 , a second solder fillet  302 , and the pair of third solder fillets  303   a  and  303   b . The first to third solder fillets  301  to  303   b  are formed by reflow soldering using a solder material that contains a flux. 
         [0094]    The first solder fillet  301  is formed spanning from the mounting face  200 A to the rear face  20 D and the first side face  20 E 1 . The first solder fillet  301  is held in the interior of the first terminal concavity  42 S. Consequently, the first terminal part  42  and the first land  201  are electrically and mechanically connected. 
         [0095]    The second solder fillet  302  is formed spanning from above the mounting face  200 A to the rear face  20 D and the second side face  20 E 2 . The second solder fillet  302  is packed in the interior of the second terminal concavity  52 S. Consequently, the second terminal part  52  and the second land  202  are electrically, mechanically, and thermally connected. 
         [0096]    The pair of third solder fillets  303   a  and  303   b  are disposed in the interior of the concavity  43 S. More specifically, the third solder fillet  303   a  is formed spanning from the mounting face  200 A to the first inner wall  43 Sa, and the third solder fillet  303   b  is formed spanning from the mounting face  200 A to the second inner wall  43 Sb. The third solder fillet  303   a  and the third solder fillet  303   b  are opposite one another. The third solder fillet  303   a  and the third solder fillet  303   b  mechanically and thermally connect the base part  43  and the third land  203 . The third inner wall  43 Sc, meanwhile, is exposed on the outside of the light emitting device  100 . 
         [0097]    Method for Manufacturing Circuit Board 
         [0098]    Next, the method for manufacturing the circuit board pertaining to the first embodiment will be described through reference to the drawings. The light emitting device  100  pertaining to the first embodiment is held in an embossed tape provided with a concave compartment for holding the light emitting device  100 . A plurality of concave compartments are provided to the embossed tape, with each compartment holding one device so that the bottom face  20 A of the light emitting device  100  does not come into contact with the bottom face of the concave compartment. 
         [0099]    The device that conveys the light emitting device  100  has a nozzle for chucking the light emitting device  100 , and the shape of the nozzle is a substantially cylindrical tube shape. The distal end of the nozzle is circular, there is an opening near the center of the circle, and air can be drawn in through this opening. The suction of the nozzle chucks the top face  20 B of the light emitting device  100  held in the embossed tape. As shown in  FIGS. 8A and 8B , the light emitting device  100 , whose top face  20 B has been chucked, is conveyed to and mounted on the mounting board  200  by moving the nozzle. It is preferable here for the distal end of the nozzle not to come into contact with the first exposed part  44  in this chucking. 
         [0100]    The mounting process will now be described in detail. The mounting board  200  has the first land  201 , the second land  202 , and the third land  203 , solder material containing flux is provided at specific locations, and the light emitting device  100  is placed on the mounting board  200  so that the first terminal part  42  of the light emitting device  100  comes into contact with the solder material on the first land  201 , the second terminal part  52  with the solder material on the second land  202 , and the base part  43  with the solder material on the third land  203 . When the light emitting device  100  is placed on the mounting board  200 , the nozzle presses the top face  20 B to the mounting board  200  side. 
         [0101]    Method for Manufacturing Light Emitting Devices 
         [0102]    A method for manufacturing a plurality of the light emitting devices  100  pertaining to the first embodiment all at once will be described through reference to the drawings.  FIG. 9A  is a cross section of a thin metal plate  451 , and  FIG. 9B  is a plan view of the thin metal plate  451 .  FIG. 10A  is a cross section of a lead frame  45 , and  FIG. 10B  is a plan view of the lead frame  45 .  FIG. 11  is a detail view of the lead frame  45 .  FIG. 12  is a cross section along the A-A line in  FIG. 11 .  FIG. 13  is a plan view of a light emitting device package array PA pertaining to this embodiment. 
         [0103]    First, the thin metal plate  451  is readied, which has a first main face S 1  and a second main face S 2  provided opposite the first main face S 1 . In this embodiment, the thin metal plate  451  has a thickness t 1  (such as about 0.5 mm). 
         [0104]    Next, as shown in  FIG. 9A , a first mask M 1  is formed over the first main face S 1 , and a second mask M 2  is formed over the second main face S 2 . The first mask M 1  and the second mask M 2  are formed in a specific pattern with respect to each other, and the first main face S 1  and the second main face S 2  are etched at the same time. Consequently, as shown in  FIG. 9B , etching holes G are formed in the thin metal plate  451 . This etching can be accomplished by dry or wet etching. An etchant that is suitable for the material of the thin metal plate  451  should be selected. 
         [0105]    Next, as shown in  FIG. 10A , a third mask M 3  is formed over the first main face S 1 , and a fourth mask M 4  is formed over the second main face S 2 . The third mask M 3  has a specific pattern. The fourth mask M 4  covers the entire second main face S 2 , and only the first main face S 1  is etched. As shown in  FIG. 10B , this completes the lead frame  45 , which has etching concavities H formed in the first main face S 1 . The depth of the etching concavities H is about 0.3 mm, for example. Accordingly, the portion of the thin metal plate  451  in which the etching concavities H are formed has a thickness t 2  (such as about 0.2 mm) that is less than the thickness t 1 . 
         [0106]    The configuration of the lead frame  45  formed in this manner will be described in detail through reference to the drawings.  FIG. 11  is a detail view of part of the lead frame  45  shown in  FIG. 10B . As shown in  FIG. 11 , the lead frame  45  has a first frame part F 1 , a second frame part F 2 , a third frame part F 3 , and a fourth frame part F 4 . 
         [0107]    The first frame part F 1  and the second frame part F 2  are adjacent to each other in a specific direction, and are linked by a first linking frame R 1 . The third frame part F 3  and the fourth frame part F 4  are adjacent to each other in a specific direction, and are linked by a second linking frame R 2 . The first frame part F 1  and the third frame part F 3  are adjacent to each other in a perpendicular direction, which is perpendicular to a specific direction (an example of a perpendicular direction), and are linked by a third linking frame R 3  and a fourth linking frame R 4 . The second frame part F 2  and the fourth frame part F 4  are adjacent to each other in a perpendicular direction, and are linked by a fifth linking frame R 5  and a sixth linking frame R 6 . 
         [0108]    The first to fourth frame parts F 1  to F 4  each have the same configuration, and include a first thick-walled part P 1 , a second thick-walled part P 2 , a first thin-walled part Q 1 , and a second thin-walled part Q 2 . 
         [0109]    The first thick-walled part P 1  has a first thickness t 1  (that is, the thickness of the thin metal plate  451 ). In a later step, the first thick-walled part P 1  is cut with a dicing saw to form the base part  43 . The second thick-walled part P 2  has the first thickness t 1 . The second thick-walled part P 2  is isolated from the first thick-walled part P 1  in a specific direction. In a later step, the second thick-walled part P 2  is cut with a dicing saw to form the first terminal part  42  and the second terminal part  52 . 
         [0110]    The first thin-walled part Q 1  has a second thickness t 2  (that is, the thickness of the portion of the thin metal plate  451  where the etching concavities H are formed). The first thin-walled part Q 1  is linked to the first thick-walled part P 1  and the second thick-walled part P 2 . The first thin-walled part Q 1  corresponds to the first connector  41  of the light emitting device  100 . The second thin-walled part Q 2  has the second thickness t 2  (that is, the thickness of the portion of the thin metal plate  451  where the etching concavities H are formed). The second thin-walled part Q 2  is linked to the first thick-walled part P 1 , and is isolated from the first thin-walled part Q 1  via the etching holes G in a specific direction (see  FIG. 9 ). The second thin-walled part Q 2  corresponds to the second connector  51  of the light emitting device  100 . 
         [0111]    In this embodiment, in a plan view of the lead frame  45 , a one-sided etching concavity X, which is a part of the etching concavity H, is formed on the inside of the first thick-walled part P 1  of each of the frame parts F. As shown in  FIG. 12 , the portion of the first thick-walled part P 1  where the one-sided etching concavities X are formed has the second thickness t 2 . In a later step, the one-sided etching concavities X are cut with a dicing saw to form the concavity  43 S (see  FIG. 13 ). 
         [0112]    Similarly, in this embodiment, in a plan view of the lead frame  45 D, a one-sided etching concavity Y, which is a part of the etching concavity H, is formed on the inside of the second thick-walled part P 2  of each of the frame parts F. As shown in  FIG. 14 , the portion of the second thick-walled part P 2  where the one-sided etching concavities Y are formed has the second thickness t 2 . In a later step, the one-sided etching concavities Y are cut with a dicing saw to form the first terminal concavity  42 S and the second terminal concavity  52 S (see  FIG. 13 ). 
         [0113]    In this embodiment, the first thin-walled part Q 1  of the third frame part F 3  is linked via the third linking frame R 3  to the first thick-walled part P 1  of the first frame part F 1 . The second thin-walled part Q 2  of the third frame part F 3  is linked via the fourth linking frame R 4  to the second thick-walled part P 2  of the first frame part F 1 . Similarly, the first thin-walled part Q 1  of the fourth frame part F 4  is linked via the fifth linking frame R 5  to the first thick-walled part P 1  of the second frame part F 2 . The second thin-walled part Q 2  of the fourth frame part F 4  is linked via the sixth linking frame R 6  to the second thick-walled part P 2  of the second frame part F 2 . 
         [0114]    The first to sixth linking frames R 1  to R 6  are cut with a dicing saw in a later step (see  FIG. 13 ). The fifth and sixth linking frames R 5  and R 6  are cut to form the first exposed part  44  and the second exposed part  54 . As shown in  FIG. 11 , the portion of the first thick-walled part P 1  that is linked to the third linking frame R 3 , and the portion of the second thick-walled part P 2  that is linked to the fourth linking frame R 4  are disposed in a specific direction, and a cutting allowance is left for dicing. 
         [0115]    Next, the lead frame  45  is disposed in a metal mold. More specifically, the lead frame  45  is sandwiched between upper and lower molds. 
         [0116]    Next, the molding material that makes up the molded article  30  (such as a thermosetting resin) is injected between the upper and lower molds. 
         [0117]    Next, the molding material is transfer molded by being heated at a specific temperature. As shown in  FIG. 13 , this completes a light emitting device package array PA made up of the lead frame  45  and a molded board  46  in which the lead frame  45  is embedded. Care should be taken with the light emitting device package array PA so that the first thick-walled part P 1  and the one-sided etching concavities X, and the second thick-walled part P 2  and the one-sided etching concavities Y, are exposed from the molded board  46 . 
         [0118]    Then, as shown in  FIG. 13 , a dicing saw is used to cut the light emitting device package array PA along cutting lines G 1  and G 2  of a specific width. This allows a plurality of light emitting devices  100  to be manufactured all at once. 
         [0119]    Action and Effect 
         [0120]    (1) The light emitting device  100  pertaining to the first embodiment comprises the light emitting element  10  and a package that is made up of the molded article  30  and leads including the first terminal part  42  and the second terminal part  52 , and that has the bottom face  20 A, the top face  20 B that is opposite the bottom face, the front face  20 C that is a light emission face contiguous with the bottom face  20 A and the top face  20 B, the rear face  20 D that is opposite the front face  20 C, and the first side face  20 E 1  and the second side face  20 E 2  that are contiguous with the front face  20 C and the rear face  20 D, respectively. The leads have the first lead  40 , which has the first connector  41  on which the light emitting element  10  is placed, and the second lead  50 , which has the second connector  51  and the second terminal part  52  that are electrically connected to the light emitting element  10 . The first terminal part  42  and the second terminal part  52  are exposed at the bottom face  20 A, and the first lead  40  has the first exposed part  44  that is exposed at the top face  20 B. 
         [0121]    Therefore, when pressure is applied from the top face  20 B side toward the interior of the package  20 , the pressure exerted around the first exposed part  44 , including the first exposed part  44 , is transmitted through the molded article  30 , from the second terminal part  52  to the mounting board, so the top face  20 B can be supported. This is turn makes it less likely that the top face  20 B will be bent toward the interior of the package  20 , allowing a side-view type of light emitting device to be obtained with less cracking in the top face  20 B and at a higher yield. 
         [0122]    Also, cracking caused by the bending of the top face  20 B can be suppressed in the step of mounting the side-view light emitting device  100  on the mounting board  200  with a nozzle. Also, the nozzle tends to come into contact with the first exposed part  44  in the step of mounting the light emitting device  100  on the mounting board  200  with the nozzle. If the light emitting device  100  is mounted while the nozzle is in contact with the first exposed part  44 , the first exposed part  44  can bear the pressure exerted by the nozzle, so the top face  20 B will be resistant to bending toward the interior of the package  20 . 
         [0123]    (2) With the light emitting device  100  pertaining to the first embodiment, the first lead  40  has the base part  43  that is linked to the lower end of the first connector  41 , and the base part  43  is exposed at the bottom face  20 A. 
         [0124]    Therefore, when pressure is applied from the top face  20 B side toward the interior of the package  20 , the base part  43  is exposed at the bottom face  20 A, and consequently the pressure exerted around the first exposed part  44 , including the first exposed part  44 , is exerted directly on the mounting board from the package  20 , so the first exposed part  44  can support the top face  20 B more stably. This in turn makes the top face  20 B less likely to bend toward the interior of the package  20 , and further suppresses cracking on the top face  20 B. 
         [0125]    (3) With the light emitting device  100  pertaining to the first embodiment, the first exposed part  44  is formed so as to be opposite the base part  43  with the first connector  41  in between. 
         [0126]    Therefore, when pressure is applied from the top face  20 B side toward the interior of the package  20 , the pressure exerted around the first exposed part  44 , including the first exposed part  44 , is transmitted linearly toward the base part  43 , so the first exposed part  44  can support the top face  20 B more stably. This in turn makes the top face  20 B less likely to bend toward the interior of the package  20 , and further suppresses cracking on the top face  20 B. 
         [0127]    (4) With the light emitting device  100  pertaining to the first embodiment, the first lead  40  has the first terminal part  42 . 
         [0128]    Therefore, when pressure is applied from the top face  20 B side toward the interior of the package  20 , the first terminal part  42  is exposed at the bottom face  20 A, and as a result the pressure exerted around the first exposed part  44 , including the first exposed part  44 , is transmitted directly from the package  20  to the mounting board, so the first exposed part  44  can support the top face  20 B more stably. This in turn makes the top face  20 B less likely to bend toward the interior of the package  20 , and further suppresses cracking on the top face  20 B. Also, with the light emitting device  100  pertaining to the first embodiment, the first terminal part  42  is successively-exposed at the bottom face  20 A and the first side face  20 E 1 , and the second terminal part  52  is successively-exposed at the bottom face  20 A and the second side face  20 E 2 . Therefore, it is possible to parry pressure applied on the periphery of the first exposed part  44  from either end of the package  20  to the mounting board  200 . 
         [0129]    (5) With the light emitting device  100  pertaining to the first embodiment, the second lead  50  has a second exposed part that is exposed at the top face  20 B. 
         [0130]    Therefore, pressure exerted around the first exposed part  44 , including the first exposed part  44 , is transmitted through the molded article  30 , from the second terminal part  52  to the mounting board, so the top face  20 B can be supported better. This in turn makes the top face  20 B less likely to bend toward the interior of the package  20 , and further suppresses cracking on the top face  20 B, allowing a side-view type of light emitting device to be obtained at a higher yield. 
         [0131]    (6) With the light emitting device  100  pertaining to the first embodiment, the second exposed part is formed so as to be opposite the second terminal part  52 , with the second connector  51  in between. 
         [0132]    Therefore, when pressure is applied from the top face  20 B side toward the interior of the package  20 , the pressure exerted around the second exposed part, including the second exposed part, is transmitted linearly toward the second end face  52 B, so the pressure exerted around the second exposed part  54 , including the second exposed part  54 , is exerted linearly from the molded article  30  on the mounting board, so the second exposed part  54  can support the top face  20 B more stably. This in turn further suppresses cracking on the top face  20 B. 
         [0133]    (7) In a method for manufacturing the circuit board  300  pertaining to the first embodiment, the light emitting device  100  is chucked at its top face  20 B by a nozzle  400  and conveyed over the mounting board  200  so that the nozzle  400  and the first exposed part  44  do not come into contact with each other, and the first terminal part  42  and the second terminal part  52  are mounted so as to be in contact with the first land  201  and the second land  202 , respectively. 
         [0134]    Therefore, the nozzle presses while in contact with the first exposed part  44  that supports the top face  20 B, so the top face  20 B is less likely to bend toward the interior of the package  20 , and cracking of the top face  20 B can be suppressed. 
       Second Embodiment 
       [0135]    Next, a second embodiment will be described through reference to the drawings. The difference between the first and second embodiments is that the light emitting device  100  comprises three terminal parts. The following description will focus on this difference. 
         [0136]    Configuration of Light Emitting Device 
         [0137]      FIG. 14  is an oblique see-through view of a light emitting device  100 A pertaining to the second embodiment, as seen from the front.  FIG. 15  is an oblique see-through view of the light emitting device  100 A pertaining to the second embodiment, as seen from the rear. 
         [0138]    As shown in  FIGS. 14 and 15 , the light emitting device  100 A comprises a first lead  140 , a second lead  150 , a third lead  160 , a blue light emitting element  10 B, a green light emitting element  104  and a red light emitting element  10 R. 
         [0139]    The first lead  140  (an example of a “first lead”) has a first connector  141  (an example of a “first connector”) and a base part  143 . The second lead  150  (an example of a “second lead”) has a second connector  151  (an example of a “second connector”), a second terminal part  152  (an example of a “second terminal part”), and a second terminal concavity  152 S (an example of a “second terminal concavity”). The third lead  160  has a third connector  161  that is electrically connected to light emitting elements, a first terminal part  142  (an example of a “first terminal part”), and a first terminal concavity  1425  (an example of a “first terminal concavity”). A placement component  161  and an exposed part  162  are provided. The first terminal part  142 , the second terminal part  152 , and the base part  143  are each electrically connected to a mounting board (not shown), and thereby function as external terminals. 
         [0140]    The blue light emitting element  10 B, the green light emitting element  104  and the red light emitting element  10 R are placed on a placement face  141 A of the first connector  141 . The blue light emitting element  10 B is electrically connected to a third connection face  161 A of the third connector  161 , and the green light emitting element  10 G to a second connection face  151 A of the second connector  151 . The red light emitting element  10 R is electrically connected to the second connection face  151 A and the third connection face  161 A. 
         [0141]    Action and Effect 
         [0142]    With the light emitting device  100 A pertaining to the second embodiment, a package  120  has the third lead  160 , which has the third connector  161  that is electrically connected to the light emitting elements  10 , and the third lead  160  also has the first terminal part  142 . Again with this light emitting device  100 A, when pressure is applied from the top face  120 B side toward the interior of the package  120 , the pressure that is exerted around a first exposed part  144 , including the first exposed part  144 , is transmitted via a molded article  130 , from the second terminal part  152  to the mounting board, so the top face  120 B can be supported. 
         [0143]    Also, with the light emitting device  100 A pertaining to the second embodiment, because the third lead has the first terminal part  142 , when pressure is applied from the top face  120 B side toward the interior of the package  120 , the pressure that is exerted around the first exposed part  144 , including the first exposed part  144 , is transmitted via the molded article  130 , from the first terminal part  142  to the mounting board, so the top face  120 B can be supported better. 
         [0144]    Also, with the light emitting device  100 A pertaining to the second embodiment, the third lead has a third exposed part  164  that is exposed at the top face  120 B. Therefore, the pressure that is exerted around the third exposed part  164 , including the third exposed part  164 , is transmitted via the molded article  130 , from the second terminal part  152  to the mounting board, so the top face  120 B can be supported better. 
         [0145]    Also, with the light emitting device  100 A pertaining to the second embodiment, the third exposed part  164  is formed so as to be opposite the first terminal part  142 , with the third connector  161  in between. Therefore, the pressure that is exerted around the first exposed part  144 , including the third exposed part  164 , is transmitted linearly toward the first terminal part  142 , so the third exposed part  164  can support the top face  120 B more stably. This in turn further suppresses cracking of the top face  120 B when pressure is exerted from the top face  120 B side toward the interior of the package  120 . 
       Third Embodiment 
       [0146]    Next, a third embodiment will be described through reference to the drawings. The difference between the first and third embodiments is that a part of each of the first lead  40  and the second lead  50  extends toward the rear face  20 D. The following description will focus on this difference. 
         [0147]    Configuration of Light Emitting Device 
         [0148]      FIG. 16  is an oblique see-through view of a light emitting device  100  pertaining to a third embodiment, as seen from the rear. As shown in  FIG. 16 , with the light emitting device  100 , the first lead  40  has a first extension  101 , and the second lead  50  has a second extension  102 . 
         [0149]    The first extension  101  is disposed on the first connector  41 , and is connected to the first terminal part  42 . The first extension  101  extends from the surface of the first connector  41  on the rear face  20 D side, toward the rear face  20 D, and is exposed from the molded article  30  at the rear face  20 D. The first extension  101  has a first extension face  101 S that forms part of the rear face  201 ). 
         [0150]    The second extension  102  is disposed on the second connector  51 , and is connected to the second terminal part  52 . The second extension  102  extends from the surface of the second connector  51  on the rear face  20 D side, toward the rear face  20 D, and is exposed from the molded article  30  at the rear face  20 D. The second extension  102  has a second extension face  102 S that forms part of the rear face  20 D. 
         [0151]    Method for Manufacturing Light Emitting Device 
         [0152]    First, the lead frame  45 D shown in  FIG. 17  is readied. The lead frame  45 D comprises a first extension base  101 A and a second extension base  101 B. This lead frame  45 D can be formed by setting the region in which one-sided etching is performed in order to form a first connection base  41 A and a second connection base  51 A, as shown in  FIG. 17 . 
         [0153]    With the lead frame  45 D pertaining to this embodiment, the one-sided etching concavities X and the one-sided etching concavities Y are set to be larger than the lead frame  45  pertaining to the first embodiment. This raises the dimensional machining limit at which one-sided etching is possible. 
         [0154]    Thus, the lead frame  45 D pertaining to this embodiment has a fundamentally different configuration from that of the lead frame  45  pertaining to the first embodiment. The detailed configuration of the lead frame  45 D will now be described through reference to the drawings.  FIG. 18  is a detail view of a lead frame  45 D. As shown in  FIG. 18 , the lead frame  45 D has first to fourth frame parts F 1  to F 4 . The first frame part F 1  and the second frame part F 2  are adjacent to each other in a specific direction, but are not linked. Similarly, the third frame part F 3  and the fourth frame part F 4  are adjacent to each other in a specific direction, but are not linked. 
         [0155]    In this embodiment, the third frame part F 3  and the fourth frame part F 4  are disposed in rotational symmetry with respect to the first frame part F 1  and the second frame part F 2  around an axis T that is parallel to the thickness direction (a direction that is perpendicular to the specific direction and the perpendicular direction, that is, a direction that is perpendicular to the plane of the drawing). The first thick-walled part P 1  of the third frame part F 3  is directly linked to the first thick-walled part P 1  of the first frame part F 1 . The second thick-walled part P 2  of the third frame part F 3  is directly linked to the second thick-walled part P 2  of the second frame part F 2 . The second thick-walled part P 2  of the fourth frame part F 4  is directly linked to the second thick-walled part P 2  of the first frame part F 1 . 
         [0156]    Also, in this embodiment, in a plan view of the lead frame  45 D, part of the etching concavities H is formed on the inside of the first thick-walled part P 1  of the frame parts F. Consequently, the one-side etching concavities X are formed by linking the first thick-walled part P 1  of the third frame part F 3  and the first thick-walled part P 1  of the first frame part F 1 . 
         [0157]    Similarly, in this embodiment, in a plan view of the lead frame  45 D, part of the etching concavities H is formed on the inside of the second thick-walled part P 2  of the frame parts. Consequently, the one-side etching concavities Y are formed by linking the second thick-walled part P 2  of the first frame part F 1  and the second thick-walled part P 2  of the fourth frame part F 4 . Also, the one-side etching concavities Y are formed by linking the second thick-walled part P 2  of the second frame part F 2  and the second thick-walled part P 2  of the third frame part F 3 . 
         [0158]    The portion where the first thick-walled part P 1  of the third frame part F 3  and the first thick-walled part P 1  of the first frame part F 1  are linked constitutes a cutting allowance for dicing (see  FIG. 19 ). Similarly, the portion where the second thick-walled part P 2  of the third frame part F 3  and the second thick-walled part P 2  of the second frame part F 2  are linked constitutes a cutting allowance for dicing. The portion where the second thick-walled part P 2  of the fourth frame part F 4  and the second thick-walled part P 2  of the first frame part F 1  are linked also constitutes a cutting allowance for dicing. 
         [0159]    Next, as shown in  FIG. 18 , the light emitting device package array PA is completed by embedding the lead frame  45 D in a molded board  46  by transfer molding. It should be noted that the first thick-walled part P 1  and the one-side etching concavities X, and the second thick-walled part P 2  and the one-side etching concavities Y are exposed from the molded board  46  in the light emitting device package array PA. 
         [0160]    Next, as shown in  FIG. 19 , the light emitting device package array PA is cut with a dicing saw along cutting lines H 1  and H 2  having a specific width. Here, the first terminal concavity  42 S and the second terminal concavity  52 S are formed by cutting the one-side etching concavities Y in a cross shape. The first exposed part  44  and the second exposed part  54  are formed by cutting a seventh linking frame R 7  with a dicing saw. 
         [0161]    Action and Effect 
         [0162]    With the light emitting device  100  pertaining to the third embodiment, the first lead  40  has the first extension  101 . The first extension  101  is disposed on the first connector  41 , and is connected to the first terminal part  42 . Therefore, when pressure is applied from the top face  20 B side toward the interior of the package  20 , the pressure exerted around the first exposed part  44 , including the first exposed part  44 , is transmitted via the first extension  101  to the first terminal part  42 , and less pressure is exerted on the top face  20 B. This makes it less likely that the top face  20 B will bend toward the interior of the package  20 , and further suppresses cracking of the top face  20 B. 
         [0163]    The fact that the first extension face  1015  is exposed at the outer surface of the molded article  30  means that the first extension  101  is in contact with the inner face of the metal mold in the process of manufacturing the molded article  30 . Therefore, the first connector  41  is supported by the first extension  101 , so minute vibrations of the first connector  41  can be suppressed by the resin material that is injected. Therefore, the resin material can be evenly spread out around the first connector  41 , and this improves the adhesion between the molded article  30  and the first lead  40 . 
         [0164]    The same action and effect as the first extension are had by the second extension  102 . 
       OTHER EMBODIMENTS 
       [0165]    The present invention was described by the above embodiments, but the text and drawings that make up part of this disclosure should not be construed as limiting this invention. Various alternative embodiments, working examples, and applied technology will be apparent to a person skilled in the art from this disclosure. 
         [0166]    (A) In the above embodiments, the first exposed part  44  was surrounded by the molded article  30  at the top face  20 B, but this is not the only option. In terms of the strength of the package  20 , the first exposed part  44  may be exposed at the boundary between the top face  20 B and the rear face  20 D, or the first exposed part  44  may be exposed all the way to the boundary between the top face  20 B and the first side face  20 E 1  or the second side face  20 E 2 . The same applies to the second exposed part  54  and the third exposed part  164 . 
         [0167]    (B) In the above embodiments, there was only one first exposed part  44 , but this is not the only option. There may be a plurality of first exposed parts  44 . The same applies to the second exposed part  54  and the third exposed part  164 . 
         [0168]    (C) In the above embodiments, the base part  43  had the concavity  43 S, but this is not the only option. The base part  43  need not have the concavity  43 S. Here again, heat can be effectively dispersed from the first exposed face  43 A and the second exposed face  43 B. In this case, if the third solder fillets  303  are not provided, then the third land  203  need not be formed on the mounting board  200 . 
         [0169]    (D) In the above embodiments, the base part  43  was L-shaped, and extended from the bottom face  20 A side of the first connector  41  to the rear face  20 D side, but this is not the only option. The base part  43  may be disposed on the bottom face  20 A side of the first connector  41 , and not extend to the rear face  20 D side of the first connector  41 . Specifically, the base part  43  may be a flat member that is disposed parallel to the bottom face  20 A side of the first connector  41 . 
         [0170]    (E) In the above embodiments, the base part  43  was exposed from the molded article  30  at the bottom face  20 A and the rear face  20 D of the package  20 , but this is not the only option. The base part  43  may be exposed at just the bottom face  20 A. 
         [0171]    (F) In the above embodiments, the base part  43  was L-shaped, but this is not the only option. The base part  43  may have a flat shape, a rod shape, a cylindrical shape, or some other, more complicated shape. 
         [0172]    (G) In the above embodiments, the first terminal part  42  and the base part  43  were each formed in a three-dimensional shape, but this is not the only option. The shapes of the first terminal part  42  and the base part  43  can be modified as needed. 
         [0173]    (H) In the above embodiments, the first solder fillet  301  came into contact with the first end face  42 A and the second end face  42 B of the first terminal part  42  as shown in  FIG. 7 , but this is not the only option. The first solder fillet  301  may be held in the first terminal concavity  42 S and may be in contact with just the first end face  42 A or the second end face  42 B, or may not be in contact with either one. 
         [0174]    (I) In the above embodiments, the light emitting device  100  had the first extension  101  on the first lead  40 , and had the second extension  102  on the second lead  50 , but this is not the only option. It may instead have just the first extension  101  on the first lead, or may have just the second extension  102  on the second lead. 
         [0175]    (J) In the above embodiments, if the first lead  40  had the first terminal part  42  and the first exposed part  44 , the second lead  50  had the second terminal part  52  and the second exposed part  54 , and the first terminal part  42  and the second terminal part  52  are not in symmetry around the center point of the top face  20 B, then the user can tell whether the first terminal part  42  is the cathode or the anode. 
         [0176]    (K) In the above embodiments, the first exposed part  44  can be thinly plated. The same applies to the second exposed part  54  and the third exposed part  164 . 
         [0177]    Similarly, the second solder fillet  302  was in contact with the first end face  52 A and the second end face  52 B of the second terminal part  52 , but this is not the only option. The second solder fillet  302  may be held in the second terminal concavity  52 S and may be in contact with just the first end face  52 A or the second end face  52 B, or may not be in contact with either one. 
         [0178]    Thus, the present invention of course encompasses various embodiments, etc., that are not discussed herein. Therefore the technological scope of the present invention is defined only by the invention-defining matters pertaining to the appropriate claims from the above description.