Patent Publication Number: US-2022223763-A1

Title: Light-emitting device and method of manufacturing the same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 16/775,471, filed on Jan. 29, 2020, which claims priority to Japanese Patent Application No. 2019-016498, filed on Jan. 31, 2019. The contents of these applications are hereby incorporated by reference in their entireties. 
    
    
     BACKGROUND 
     The present disclosure relates to a light-emitting device and a method of manufacturing the same. 
     Light-emitting devices employing light-emitting elements, such as light-emitting diodes or laser diodes, are used in various fields including general lighting such as interior lighting, light sources for vehicles, and backlight devices for liquid-crystal display devices. The required performance for these light-emitting devices is becoming increasingly high, and further improvement in reliability is required. 
     A light-emitting device is known in which a light-emitting element is mounted on an upper surface of a lead, a resin frame surrounds the light-emitting element, a first sealing resin is filled inside the resin frame to seal the light-emitting element, and a second sealing resin covers the resin frame and the first sealing resin (for example, see Japanese Patent Publication No. 2014-209602). 
     SUMMARY 
     According to increase in variety of use of such light-emitting devices, further improvement in the light extraction and light distribution of the light-emitting device is required. 
     Accordingly, one object of certain embodiments according to the present disclosure is to provide a light-emitting device with good light-extraction and light-distribution, and a method of manufacturing the same. 
     A light-emitting device according to one embodiment of the present disclosure includes a base member including a first lead, a second lead, and a securing member securing the first lead and the second lead, a light-emitting element mounted on an upper surface of the base member, a frame disposed on the upper surface of the base member to surround the light-emitting element, a first member covering at least a portion of an upper surface of the securing member exposed at an outer peripheral side of the frame in a top view, the first member being in contact with an outer lateral surface of the frame and containing a reflective material, and a second member covering the light-emitting element, the frame, and the first member. The first member has an inclined region in a cross-sectional view. A height of the inclined region is less than a height of an upper end of the frame. 
     A method of manufacturing a light-emitting device according to one embodiment of the present disclosure includes mounting a light-emitting element on an upper surface of a base member including a first lead, a second lead, and a securing member securing the first lead and the second lead; disposing a first member comprising a reflective material on the upper surface of the base member to surround the light-emitting element and to cover at least a portion of an upper surface of the securing member; disposing a frame on the upper surface of the base member such that the frame is in contact with an inner lateral surface of the first member and the upper surface of the base member, has a height from the base member greater than a height of the first member in a cross-sectional view, and surrounds the light-emitting element; and disposing a second member to cover the light-emitting element, the frame, and the first member. 
     A method of manufacturing a light-emitting device according to another embodiment of the present disclosure includes mounting a light-emitting element on an upper surface of a base member including a first lead, a second lead, and a securing member securing the first lead and the second lead; disposing a frame on the upper surface of the base member to surround the light-emitting element; disposing a first member comprising a reflective material such that the first member is in contact with an outer lateral surface of the frame and the upper surface of the base member, covers at least a portion of an upper surface of the securing member exposed at an outer peripheral side of the frame, and has a height from the base member less than a height of the frame in a cross-sectional view; and disposing a second member to cover the light-emitting element, the frame, and the first member. 
     A light-emitting device according to certain embodiments of the present disclosure and a method of manufacturing the same allows the light emitting device with good light-extraction and light-distribution. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a schematic plan view of the structure of a light-emitting device according to a first embodiment. 
         FIG. 1B  is a schematic cross-sectional view taken along the line IB-IB of  FIG. 1A . 
         FIG. 1C  is a schematic partially-enlarged cross-sectional view of  FIG. 1B . 
         FIG. 1D  is a schematic cross-sectional view of another example of a first member in  FIG. 1C . 
         FIG. 1E  is a schematic cross-sectional view of even another example of the first member in  FIG. 1C . 
         FIG. 1F  is a schematic cross-sectional view of still another example of the first member in  FIG. 1C . 
         FIG. 1G  is a schematic cross-sectional view of yet another example of the first member in  FIG. 1C . 
         FIG. 2  is a schematic plan view of the light-emitting device according to the first embodiment, in which a frame, first members, and a second member are not shown. 
         FIG. 3  is a schematic plan view of the light-emitting device according to the first embodiment, in which the frame and the second member are not shown. 
         FIG. 4  is a schematic plan view of the light-emitting device according to the first embodiment, in which the second member is not shown. 
         FIG. 5A  is a schematic cross-sectional view for illustrating the operations and effects of the first members. 
         FIG. 5B  is a schematic cross-sectional view for illustrating the operations and effects of the first members. 
         FIG. 6  is a flowchart of a first method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 7A  is a schematic cross-sectional view taken along the line VIIA-VIIA of  FIG. 2 , showing a base member on which light-emitting elements are disposed in the manufacturing of the first method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 7B  is a schematic cross-sectional view taken along the line VIIB-VIIB of  FIG. 3 , showing the base member on which first members are disposed in the manufacturing of the first method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 7C  is a schematic cross-sectional view taken along the line VIIC-VIIC of  FIG. 4 , showing the base member on which the frame is disposed in the manufacturing of the first method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 7D  is a schematic cross-sectional view illustrating disposing of the second member in the manufacturing of the first method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 8  is a flowchart showing a second method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 9A  is a schematic cross-sectional view of the base member on which the frame is disposed in the manufacturing of the second method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 9B  is a schematic cross-sectional view of the base member on which the first members are disposed in the manufacturing of the second method of manufacturing the light-emitting device according to the first embodiment. 
         FIG. 10  is a schematic cross-sectional view of a structure of a light-emitting device according to a second embodiment. 
         FIG. 11  is a flowchart of a first method of manufacturing the light-emitting device according to the second embodiment. 
         FIG. 12  is a flowchart of a second method of manufacturing the light-emitting device according to the second embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Certain embodiments of the present invention will be described with reference to the drawings. In the description below, examples of light-emitting devices are described to give a concrete form to the technical ideas of the present invention. However, the present invention is not limited to the examples described below. Unless specifically stated otherwise, the sizes, materials, shapes, and relative positions of components described in the embodiments are not intended to limit the scope of the present invention, but are described as examples. Sizes or positional relations of members illustrated in the drawings may be exaggerated in order to clarify the descriptions. In the descriptions below, the same term or reference numeral represents the same member or a member made of the same material, and its detailed description will be omitted as appropriate. 
     First Embodiment 
     Light-Emitting Device 
     A light-emitting device according to a first embodiment will be described. 
       FIG. 1A  is a schematic plan view of the structure of the light-emitting device according to the first embodiment.  FIG. 1B  is a schematic cross-sectional view taken along the line IB-IB of  FIG. 1A .  FIG. 1C  is a schematic partially-enlarged cross-sectional view of  FIG. 1B .  FIG. 1D  is a schematic cross-sectional view of another example of a first member in  FIG. 1C .  FIG. 1E  is a schematic cross-sectional view of even another example of the first member in  FIG. 1C .  FIG. 1F  is a schematic cross-sectional view of still another example of the first member in  FIG. 1C .  FIG. 1G  is a schematic cross-sectional view of yet another example of the first member in  FIG. 1C .  FIG. 2  is a schematic plan view of the light-emitting device according to the first embodiment, in which a frame, first members, and a second member are not shown.  FIG. 3  is a schematic plan view of the light-emitting device according to the first embodiment, in which the frame and the second member are not shown.  FIG. 4  is a schematic plan view of the light-emitting device according to the first embodiment, in which the second member is not shown.  FIG. 5A  is a schematic cross-sectional view for illustrating the operations and effects of the first members.  FIG. 5B  is a schematic cross-sectional view for illustrating the operations and effects of the first members. 
     As shown in  FIG. 1A  to  FIG. 4 , a light-emitting device  10  includes a base member  20  that includes a first lead  20 A, a second lead  20 B, and a securing member  20 C securing the first lead  20 A and the second lead  20 B; light-emitting elements  40  mounted on an upper surface of the base member  20 ; a frame  50  disposed on the upper surface of the base member  20  to surround the light-emitting elements  40 ; first members  30  covering at least a portion of the upper surface of the securing member  20 C exposed at an outer peripheral side of the frame  50  in a top view, being in contact with the outer lateral surface of the frame  50 , and containing a reflective material; and a second member  70  covering the light-emitting elements  40 , the frame  50 , and the first members  30 . Each of the first members  30  includes an inclined region  31  in a cross-sectional view, and a height H 1  of the inclined region  31  is less than a height H 2  of the upper end of the frame  50 . Components of the light-emitting device will be described below. 
     Base Member 
     As shown in  FIG. 2 , the base member  20  includes the first lead  20 A, the second lead  20 B, and the securing member  20 C that secures the first lead  20 A and the second lead  20 B such that the leads are separated from each other. The upper surface of the first lead  20 A, the upper surface of the second lead  20 B, and the upper surface of the securing member  20 C can be in the same plane. The lower surface of the first lead  20 A, the lower surface of the second lead  20 B, and the lower surface of the securing member  20 C can also be in the same plane. 
     For example, the first lead  20 A includes a mounting portion  21 A on which the light-emitting elements  40  are disposed, the mounting portion  21 A having a substantially polygonal shape and located at the center of the base member  20 , a terminal portion  23 A located at an end side of the base member  20 , and a connecting portion  22 A connecting the mounting portion  21 A to the terminal portion  23 A. A width W 22  of the connecting portion  22 A is less than a width W 21  of the mounting portion  21 A and less than a width W 23  of the terminal portion  23 A. The width W 23  of the terminal portion  23 A is greater than the width W 21  of the mounting portion  21 A and is approximately equal to the width of the base member  20 . The connecting portion  22 A includes a region connected to a wire  60  of a light-emitting element  40 . A “width” of each of the first lead  20 A and the second lead  20 B refers to the maximum length of each of the first lead  20 A and the second lead  20 B in the direction perpendicular to the direction of extension of the connecting portion  22 A from the mounting portion  21 A. 
     The mounting portion  21 A has a substantially octagonal shape. The mounting portion  21 A has a first side  21 A 1  having a length equal to the width W 22  of the connecting portion  22 A, a second side  21 A 2  parallel to and opposite to the first side  21 A 1 , a third side  21 A 3  perpendicular to the first side  21 A 1  and the second side  21 A 2 , a fourth side  21 A 4  perpendicular to the first side  21 A 1  and the second side  21 A 2  and opposite to the third side  21 A 3 , an inclined fifth side  21 A 5  connecting the first side  21 A 1  and the third side  21 A 3 , an inclined sixth side  21 A 6  connecting the first side  21 A 1  and the fourth side  21 A 4 , an inclined seventh side  21 A 7  connecting the second side  21 A 2  and the third side  21 A 3 , and an inclined eighth side  21 A 8  connecting the second side  21 A 2  and the fourth side  21 A 4 . In addition, the mounting portion  21 A has projections each projected from a respective one of the third side  21 A 3  and the fourth side  21 A 4 . 
     The second lead  20 B is disposed such that the intervals between the second lead  20 B and the second side  21 A 2 , the inclined seventh side  21 A 7 , and the inclined eighth side  21 A 8  of the mounting portion  21 A are substantially uniform. The second lead  20 B has a width substantially equal to the width W 23  of the terminal portion  23 A. Further, the second lead  20 B is bent at two opposite end portions of the second lead  20 B in the longer axis direction toward the mounting portion  21 A to have first and second connecting end portions  20 B 1  and  20 B 2 , so as to increase the area of the second lead  20 B. The first connecting end portion  20 B 1  has a region on which a protective element  90  is mounted. The second connecting end portion  20 B 2  has a region connected to a wire  60  of a light-emitting element  40 . 
     The area of the first lead  20 A is preferably greater than the area of the second lead  20 B in a plan view. The light-emitting elements  40  are mounted on the upper surface of the mounting portion  21 A of the first lead  20 A. Accordingly, increase of the area of the mounting portion  21 A of the first lead  20 A allows for facilitating heat generated in the light-emitting elements  40  to be transmitted to the first lead  20 A. This allows for reducing increase in the temperature of the light-emitting elements  40 , so that reliability of the light-emitting device  10  can be improved. 
     End surfaces of the first lead  20 A and/or the second lead  20 B preferably have recesses or projections. With recesses or projections located at which the first lead  20 A and/or the second lead  20 B are in contact with the securing member  20 C, contact area between the securing member  20 C and the first lead  20 A and/or the second lead  20 B can be increased. Accordingly, adhesion between the securing member  20 C and the first lead  20 A and/or the second lead  20 B can be enhanced. 
     The first lead  20 A and the second lead  20 B are used to apply a voltage from an external power supply to electronic components such as the light-emitting elements  40 . The first lead  20 A and the second lead  20 B are preferably made of materials with relatively large thermal conductivities. For example, using a material with a thermal conductivity of about 200 W/(m·K) or more allows for facilitating transmission of heat generated in the light-emitting elements  40  to the first lead  20 A. 
     The first lead  20 A and the second lead  20 B are preferably made of materials with high strength that are easy to process by punching or cutting. For example, a single layer or a layered body of a metal such as copper, aluminum, gold, silver, tungsten, iron, nickel, an alloy of two or more of these metals, phosphor bronze, or a copper-iron alloy can be used for a base member of the first lead  20 A and the second lead  20 B. A metal layer may be entirely or partially disposed on surfaces of the first lead  20 A and the second lead  20 B. The metal layer may be disposed on only one of the first and second leads  20 A and  20 B. 
     A reflective film may be disposed on each of the first lead  20 A and the second lead  20 B. One or two or more metals such as aluminum, copper, or gold can be used for the reflective film. Silver is preferably used for the reflective film. This structure allows for increasing the light extraction efficiency of the light-emitting device  10 . 
     Examples of a method for forming the reflective film on the first lead  20 A and the second lead  20 B include plating, vapor deposition, sputtering, and ion beam assisted deposition. The reflective film has such a thickness that allows the film to effectively reflect light emitted from the light-emitting elements  40 . For example, the thickness of the reflective film is approximately in a range of 20 nm to 10 μm, preferably approximately in a range of 50 nm to 5 μm, more preferably approximately in a range of 100 nm to 3 μm. The thicknesses and the shapes of the first lead  20 A and the second lead  20 B can be appropriately selected in the ranges known in the art. 
     The securing member  20 C is disposed surrounding the first lead  20 A, between the second lead  20 B and the first lead  20 A, and around the one end and the other end of the second lead  20 B to secure the first lead  20 A and the second lead  20 B. The fixing member  20 C is disposed by, for example, injecting a molding resin into regions (resin injecting portions) that are surrounded by the terminal portion  23 A, the connecting portion  22 A, and the two inclined sides (the fifth side  21 A 5  and the sixth side  21 A 6 ) of the mounting portion  21 A and broaden as the distances from the connecting portion  22 A increase, to fill the molding resin into the regions around the first lead  20 A, between the second lead  20 B and the first lead  20 A, and around two opposite end portions of the second lead  20 B. By injecting the molding resin from the resin injecting portions as described above, the molding resin can be easily filled into the regions apart from the resin injecting portions, such as the region between the second lead  20 B and the first lead  20 A. The mounting portion  21 A of the first lead  20 A has a substantially polygonal shape, and the inclined fifth side  21 A 5 , inclined sixth side  21 A 6 , inclined seventh side  21 A 7 , and inclined eighth side  21 A 8  are located at the corners, so that the molding resin is easily guided to the region around the first lead  20 A, the region between the second lead  20 B and the first lead  20 A, and the regions around two opposite end portions of the second lead  20 B. 
     Examples of the material of the securing member  20 C include resins such as epoxy resins, silicone resins, BT resins, polyamide resins, polyimide resins, nylon resins, and unsaturated polyesters and ceramics. A colorant, filling material, or reinforcing fiber known in the art may be mixed with these materials. Using a white filler such as titanium oxide or zinc oxide for the colorant allows for increasing the light extraction efficiency of the light-emitting device. With a black filler, such as carbon black, having a large heat emission coefficient contained in the securing member  20 C, efficient dissipation of heat from the light-emitting elements  40  can be facilitated, and strength of the resin can be increased. Examples of the filling material include silicon oxide and aluminum oxide. Examples of the reinforcing fiber include glass, calcium silicate, and potassium titanate. 
     While the first lead  20 A includes the mounting portion  21 A on which the light-emitting elements  40  are mounted in the above description, the second lead  20 B may include a mounting portion. An example of a case in which the first lead  20 A includes the mounting portion  21 A will be described below. 
     Light-Emitting Elements  40   
     The light-emitting elements  40  are mounted on the upper surface of the mounting portion  21 A of the first lead  20 A. The light-emitting elements  40  are semiconductor elements that emit light when voltage is applied, and an upper surface of each of the light-emitting elements  40  is a light-emitting surface. Any appropriate number of the light-emitting elements  40  may be mounted on the upper surface of the mounting portion  21 A. While two light-emitting elements  40  are mounted on the upper surface of the mounting portion  21 A in the drawings, one or three or more light-emitting elements  40  may be mounted on the upper surface of the mounting portion  21 A. 
     Each of the light-emitting elements  40  preferably includes an element substrate  41  located at the base member  20  side and made of sapphire or the like, and a semiconductor layer  42  disposed on the element substrate  41  and made of a nitride semiconductor or the like. The emission wavelength of the light-emitting element  40  is selected in the range of the ultraviolet to infrared range including the visible light range (380 nm to 780 nm). For example, In X Al Y Ga 1-X-Y N (where 0≤X, 0≤Y, and X+Y≤1) can be used for the nitride semiconductor for the light-emitting element  40  with a peak wavelength in a range of 430 nm to 490 nm. The light-emitting element  40  may be disposed on the upper surface of the first lead  20 A via a submount. 
     The light-emitting element  40  may have any appropriate shape such as polygonal shapes including triangles, quadrangles, and hexagons and other shapes close to these shapes in a top view. The light-emitting element  40  may have a structure in which an n-electrode  43  and a p-electrode  44  are disposed on a single surface side, or may have a structure in which each of the n-electrode  43  and the p-electrode  44  is disposed on a respective one of two different surfaces (such as the upper surface and the lower surface). The n-electrode  43  and the p-electrode  44  of the light-emitting element  40  are connected to the first lead  20 A and the second lead  20 B by wires  60 , respectively. The n-electrode  43  and the p-electrode  44  of the light-emitting element  40  may be connected directly to the second lead  20 B and the first lead  20 A, respectively. A metal material with a good electrical conductivity, such as gold, aluminum, copper, or silver, may be used for the wires  60 . 
     When the light-emitting element  40  is provided with electrodes on a single surface side of the light-emitting element  40 , the light-emitting element  40  is face-up mounted on the upper surface of the first lead  20 A. The expression “face-up mounted” as used herein indicates that the light-emitting element  40  is mounted such that a surface of the light-emitting element  40  opposite to a surface of the light-emitting element  40  provided with the electrodes faces the base member  20 . For a bonding member that connects the light-emitting element  40  and the first lead  20 A, an insulating bonding member or an electrically-conductive bonding member may be used, and a known bonding member can be used. Examples of the insulating bonding member include epoxy resins, silicone resins, and modified resins of these resins. Examples of the electrically-conductive bonding member include pastes of electrically-conductive materials such as silver, gold, or palladium, solders such as Au—Sn eutectic solders, and brazing materials such as low-melting-point metals. 
     When the light-emitting element  40  includes electrodes on different surfaces of the light-emitting element  40 , a bonding member that connects the light-emitting element  40  and an electrically-conductive bonding member is used for the first lead  20 A, and a known bonding member may be used for the first lead  20 A. Examples of the electrically-conductive bonding member include pastes of electrically-conductive materials such as silver, gold, or palladium, solders such as Au—Sn eutectic solders, and brazing materials such as low-melting-point metals. 
     Frame 
     As shown in  FIG. 4 , the frame  50  is a frame with a loop shape disposed on the upper surface of the base member  20  to surround the light-emitting elements  40 . The inner periphery and the outer periphery of the frame  50  may have various shapes including circles, ellipses, polygons such as squares, hexagons, or octagons, and polygons with rounded corners in a top view. The frame  50  can be formed by disposing an unhardened material for the frame  50  in a region in which the frame  50  is to be formed, and then hardening the material for the frame  50 . 
     The frame  50  is located on the boundary between the first lead  20 A and the securing member  20 C to cover the connecting portion between the first lead  20 A and the securing member  20 C. That is, the frame  50  is preferably disposed such that only the mounting portion  21 A of the first lead  20 A is exposed inside the frame  50  and such that the securing member  20 C is not exposed inside the frame  50 . With the securing member  20 C not exposed inside the frame  50 , a black filler or the like contained in the securing member  20 C does not absorb light emitted from the light-emitting elements. Accordingly, the upper surface of the mounting portion  21 A reflects light emitted from the light-emitting elements to improve the light extraction of the light-emitting device  10 . 
     The size of a cross-sectional diameter D 2  (see  FIG. 1B ) of the frame  50  is appropriately selected such that the mounting portion  21 A of the first lead  20 A is exposed inside the frame  50  and such that the first lead  20 A (the terminal portion  23 A), a portion of the second lead  20 B, and a portion of the securing member  20 C are exposed outside the frame  50 . 
     The frame  50  (see  FIGS. 1B and 1C ) may have any appropriate cross-sectional shape. Various shapes such as circular shapes including partial-circular shapes, elliptic shapes including partial-elliptic shapes, and rectangular shapes, preferably semi-elliptic shapes may be employed for the cross-sectional shape of the frame  50 . In the cross-sectional shape of the frame  50 , the outer lateral surface is symmetrical or asymmetrical to the inner lateral surface. When the cross-sectional shape of the frame  50  is asymmetrical, the inclination of the outer lateral surface of the frame  50  may be gentler than the inclination of the inner lateral surface. 
     Examples of the material constituting the frame  50  include resins, ceramics, and metal bodies coated with insulating materials. Examples of the resin material include phenolic resins, epoxy resins, BT resins, PPA, and silicone resins. Silicone resins, which have good resistance to light, are preferably used for the material of the frame  50 . A base resin serving as the base material of the frame  50  is preferably the same as a resin used for a base material of the first members  30 . This structure allows for increasing adhesion between the frame  50  and the first members  30 . 
     When a powder of a reflective material or the like that is unlikely to absorb light emitted from the light-emitting elements  40  and has a refractive index greatly different from the refractive index of the base resin is dispersed in a base resin of the frame  50 , the frame  50  can efficiently reflect light emitted from the light-emitting elements  40 . Examples of the reflective material include titanium oxide, aluminum oxide, zirconium oxide, and magnesium oxide. Titanium oxide is relatively stable with respect to water and the like and has a high refractive index, and thus is preferable for the reflective material. The frame  50  has a reflectance of 60% or more, preferably 90% or more, with respect to light emitted from the light-emitting elements  40 . The content of the reflective material such as titanium oxide is appropriately selected according to molding conditions such as the fluidity of the resin. For example, in the case in which titanium oxide is used for the reflective material, the content of the reflective material preferably in a range of 20 wt % to 60 wt %, more preferably 25 wt % to 35 wt %. With such a structure, light that has reached the frame  50  is not easily absorbed by the frame  50 , so that the light extraction of the light-emitting device  10  is improved. 
     First Member 
     As shown in  FIG. 3  and  FIG. 4 , the first members  30  are disposed at the outer peripheral side of the frame  50  in a top view. The first members  30  cover at least a portion of the upper surface of the securing member  20 C exposed from the frame  50 , and inner lateral surfaces of the first members  30  are in contact with the frame  50 . 
     With the first members  30  covering at least a portion of the upper surface of the securing member  20 C, the light extraction and the light distribution of the light-emitting device  10  can be improved. Further, when the first members  30  cover the entire upper surface of the securing member  20 C exposed at the outer peripheral side of the frame  50 , the light extraction and the light distribution of the light-emitting device  10  can be further improved. The inner lateral surfaces of the first members  30  are in contact with the frame  50 , which allows for improving adhesion between the first members  30  and the frame  50 . 
     More specifically, as shown in  FIG. 5A , a portion of light L 1  emitted from the light-emitting elements  40  is reflected by a surface of a lens portion  71  of the second member  70  to be returned to the outside of the frame  50  through the lens portion  71 . When the securing member  20 C is made of a material that absorbs light, returned light L 2  may be absorbed by the securing member  20 C, but the securing member  20 C is covered with the first members  30 . Accordingly, the returned light L 2  is emitted to the outside to be reflected light L 3 , without being absorbed by the securing member  20 C. Accordingly, light extraction of the light-emitting device  10  can be improved. 
     As shown in  FIG. 5B , a plurality of light-emitting devices  10  and  11  arranged adjacent to each other are used in apparatuses such as illumination devices. Also in this case, the reflected light L 3  reflected by the first members  30  of the light-emitting device  10  is not absorbed by the securing member  20 C of an adjacent light-emitting device  11 , but is reflected by the first members  30  covering the securing member  20 C, and is emitted to the outside to be reflected light L 4 . Accordingly, decrease in the light extraction of each of the light-emitting devices  10  and  11  can be reduced. 
     As shown in  FIG. 1C , each of the first members  30  has the inclined region  31  (a region outward of an upper end U) in a cross-sectional view, and the height H 1  of the inclined region  31  is less than the height H 2  of the upper end of the frame  50 . 
     With the first member  30  having the inclined region  31 , the returned light L 2  returned from the lens portion  71  of the second member  70  is reflected by the inclined region  31  to the outside in a lateral direction, to be the reflected light L 3 . Accordingly, light distribution of the light-emitting device  10  can be improved. 
     The height H 1  of the inclined region  31 , that is, the maximum height of the inclined region  31  from the base member  20 , is preferably ⅓ or more of the height H 2  of the upper end of the frame  50  from the base member  20 , which allows increase in luminous flux of the extracted light. 
     As shown in  FIG. 1C , the inclined region  31  of the first member  30  may be curved so as to be convex in a cross-sectional view, the first member  30  may be in contact with the frame  50 , and the upper end U of the first member  30  may be in contact with the frame  50 . The inclination of the inclined region  31  increases toward the upper end U, and the inclined region  31  preferably has an inclination angle θ defined by the inclined surface and the upper surface of the base member  20  in a range of 30° to 60°. With the inclination of the inclined region  31  as described above, the area of contact between the first member  30  and the second member  70  is larger than in the case in which the inclined region  31  is flat, and accordingly, adhesion between the first member  30  and the second member  70  can be improved. When the inner lateral surface of the first member  30  is also curved so as to be convex in a cross-sectional view, the contact area between the first member  30  and the frame  50  can be increased, and adhesion between the first member  30  and the frame  50  can be improved. The first member  30  may be laterally symmetrical or laterally asymmetrical about a perpendicular line Y 1  drawn to the base from the upper end U in a cross-sectional view. When the first member  30  is laterally asymmetrical about the perpendicular line Y 1  drawn to the base, the inclination of the outer lateral surface (inclined region  31 ) of the first member  30  can be smaller than the inclination of the inner lateral surface as shown in  FIG. 1C . 
     With such a convex curved inclined region  31  as described above, the first member  30  reflects the returned light L 2  by the lens portion  71  toward a wide area; that is, the first member  30  reflect the light to the outside not only in a lateral direction to obtain the reflected light L 3  but also in an upper direction to obtain reflected light L 5 . 
     In  FIG. 1C , the outer lateral surface of the first member  30  and the outer lateral surface of the frame  50  are connected to define a recess, which allows for increasing the contact area with the second member  70 , so that adhesion between the second member  70  and the first member  30  and the frame  50  can be further increased. 
     Each first member  30  may have a shape in which the inclined region  31  is curved so as to be convex in a cross-sectional view, and the upper end U of the first member  30  may be located at the frame  50  side as shown in  FIG. 1D . The expression “the upper end U may be located at the frame  50  side” as used herein refers to that the perpendicular line Y 1  drawn to the base of the first member  30  from the upper end U may be located closer to the frame  50  than a perpendicular line Y 2  passing through a center point C of the base. When the frame  50  is not in contact with the upper end U of the first member  30  but is in contact with only the inner lateral surface (the region inward of the upper end U) of the first member  30 , much of the returned light L 2  can be incident on the outer lateral surface (inclined region  31 ) of the first member  30 , so that the reflected light L 3  traveling to the outside in a lateral direction can be increased. The first member  30  may have such a structure in which the lower end of the outer lateral surface of the frame  50  is in contact with the outer lateral surface (inclined region  31 ) of the first member  30 . 
     As shown in  FIG. 1E , the inclined region  31  of the first member  30  can be curved so as to be convex, and the lower end of the outer lateral surface of the frame  50  can be in contact with the base member  20 . With such first member  30 , much of the returned light L 2  can be incident on the inclined region  31  of the first member  30 , so that the reflected light L 3  traveling to the outside in a lateral direction can be increased. 
     The first member  30  may have a shape shown in  FIG. 1F . The inclined region  31  of the first member  30  may be a concave-curve projecting toward the lower end of the frame  50  in a cross-sectional view, and the first member  30  may be in contact with the frame  50 , and the upper end U of the first member  30  may be in contact with the frame  50 . With the inclined region  31  having such a structure, the contact area between the first member  30  and the second member  70  can be larger (than in the case in which the inclined region  31  is flat), and adhesion between the first member  30  and the second member  70  is improved. When the inner lateral surface of the first member  30  is also curved so as to be concave in a cross-sectional view, the contact area between the first member  30  and the frame  50  can be increased, so that adhesion between the first member  30  and the frame  50  can be improved. The first member  30  may be laterally symmetrical or laterally asymmetrical about the perpendicular line Y 1  drawn to the base from the upper end U in a cross-sectional view. With the inclined region  31  having such a concave-curve, a ratio that the returned light L 2  returned from the lens portion  71  is reflected to be the reflected light L 3  in a lateral direction by the first member  30  can be increased. 
     As shown in  FIG. 1G , the inclined region  31  of the first member  30  can be a concave-curve, and the lower end of the outer lateral surface of the frame  50  can be in contact with the base member  20 . Also with the first member  30  having such a structure, much of the returned light L 2  can be incident on the inclined region  31  of the first member  30 , so that the reflected light L 3  traveling to the outside in a lateral direction can be increased. 
     The inclined region  31  of the first member  30  is not limited to have a convex or concave curved shape in a cross-sectional view, but may have a wavy shape including convex and concave shapes adjacent to each other or a wavy shape including a plurality of convex shapes adjacent to each other, in a cross-sectional view. When the inclined region  31  of the first member  30  is flat, light can be extracted without being irregularly reflected, so that the light extraction efficiency can be increased. 
     The first member  30  can be continuously disposed along the outer periphery of the frame  50  over the entirety of the outer periphery of the frame  50  in a top view. When the base member  20  has a rectangular shape and the frame  50  has a circular shape, the height H 1  of the continuous first member  30  may be greater in the four corner portions of the securing member  20 C in which a large portion of the securing member  20 C is exposed from the frame  50  than in regions other than the four corners. With the height H 1  of the first member  30  in the four corners of the base member  20  is different from the height H 1  of the first member  30  in regions other than the four corners, the height H 2  of the frame  50  overlapping with the upper surface of the first member  30  varies in a wavy manner over the entire circumference of the frame  50 , so that the height H 2  of the frame  50  is uneven over the entire circumference of the frame  50 . Accordingly, the contact area between the frame  50  and the second member  70  can be increased, and the adhesion between the frame  50  and the second member  70  can be improved compared to the case in which the height H 2  of the frame  50  is uniform. Also, with the height H 1  of the first member  30  lower in the regions other than the four corners than in the four corners, the injected amount of the first member  30  when disposing the first member  30  can be minimized, so that takt time can be improved. 
     The first member  30  may be intermittently disposed along the outer periphery of the frame  50  in a top view as shown in  FIG. 4 . When the first member  30  is intermittently disposed, any appropriate number of the intermittent first members  30  can be disposed, and the number of the intermittent first members  30  is appropriately selected in consideration of the reflection efficiency of light returned by the lens portion  71 . In the case in which the base member  20  has a rectangular shape and the frame  50  has a circular shape, the first members  30  preferably cover at least the four corners of the securing member  20 C in which a large portion of the securing member  20 C is exposed from the frame  50 . With this structure, the first members  30  can sufficiently reflect light returned from the lens portion  71 , which allows for obtaining the light-emitting device  10  with sufficient light extraction and light distribution. Also when the first members  30  are intermittently disposed, with the frame  50  in which a height in the four corners of the base member  20  and a height in the regions other than the four corners are different from each other, the contact area between the frame  50  and the second member  70  can be increased, so that adhesion between the frame  50  and the second member can be improved. 
     In the first members  30 , a reflective material is mixed with a base material such as resins or ceramics. Examples of the base material that are preferably employed include resins such as phenolic resins, epoxy resins, BT resins, PPA, and silicone resins. A silicone resin, which has good resistance to light, is preferably used for the base resin. The base resin serving as the base material of the first members  30  is preferably the same as the base resin of the frame  50 . This structure allows for increasing adhesion between the frame  50  and the first members  30 . 
     In the first members  30 , a reflective material, such as powder, that is unlikely to absorb light emitted from the light-emitting elements  40  and has a refractive index greatly different from the refractive index of the base resin can be dispersed in the base resin, which allows the first members  30  to efficiently reflect light emitted from the light-emitting elements  40 . 
     The reflective material has a reflectance of 90% or more, preferably 95% or more with respect to light emitted from the light-emitting elements  40 . With such a reflective material, the returned light L 2  that has been returned from the lens portion  71  and has reached the first members  30  is not easily absorbed by the first members  30 , so that the light extraction of the light-emitting device  10  can be improved. 
     Examples of the reflective material include titanium oxide, aluminum oxide, zirconium oxide, and magnesium oxide. Titanium oxide is relatively stable toward water and the like and has a high refractive index, and thus is preferable. The content of titanium oxide in the first members  30  is preferably in a range of 10 mass % to 60 mass %. 
     Second Member 
     As shown in  FIG. 1A  and  FIG. 1B , the second member  70  covers the light-emitting elements  40 , the frame  50 , and the first members  30 . The second member  70  also covers the region outward of the frame  50 , which allows for increasing the contact area between the second member  70  and the frame  50 , so that the second member  70  can be prevented from being detached from the frame  50 . The second member  70  can cover at least a portion of each of the first lead  20 A and the second lead  20 B of the base member  20  outside the first members  30 . This structure allows for further preventing detachment of the second member  70 . 
     The second member  70  may have various shapes. Examples of the shape of the second member  70  include a plate shape, a lens shape with a convex upper surface, a lens shape with a concave upper surface, a Fresnel lens shape, and a convex lens shape with a recess near the center of the convex lens shape. With such a shape, directivity of light extracted from the second member  70  can be adjusted. 
     In the case in which the second member  70  has a lens shape, the second member  70  may include the lens portion  71 , which is located above the light-emitting elements  40  and has a convex curved extraction surface, and a flange portion  72  that is located above the first members  30  and extends outward from the lower portion of the lens portion  71 . With the second member  70  including the flange portion  72  with this structure, light emitted from the light-emitting elements  40  is reflected by the upper surface and the lateral surface of the flange portion  72  to be diffused in a wider area, so that the light distribution can be improved. 
     The second member  70  is made of a light-transmissive material through which light can be extracted. Examples of the light-transmissive material used for the second member  70  include resins, such as silicone resins and epoxy resins, and glass. 
     The second member  70  may have any appropriate cross-sectional diameter D 3  (see  FIG. 1B ), as long as the second member  70  can cover the light-emitting elements  40 , the frame  50 , and the first members  30 . The cross-sectional diameter D 3  of the second member  70  is appropriately selected in consideration of the area of emission of light emitted from the light-emitting elements  40 . 
     The second member  70  may have any appropriate refractive index as long as the difference in refractive index between the second member  70  and the air is in an appropriate range. A refractive index of the second member  70  is preferably in a range of about 1.4 to 1.6. With the second member  70  having a refractive index in such a range, light extraction can be improved. 
     The light-emitting device  10  according to the first embodiment may further include the protective element  90  as shown in  FIG. 1A . The protective element  90  is mounted on a connecting end portion  21 B 1  of the second lead  20 B and electrically connected to the mounting portion  21 A of the first lead  20 A by a wire  60 . The protective element  90  may be mounted at a position other than the position described above, and the protective element  90  may be mounted on the mounting portion  21 A of the first lead  20 A. 
     For example, the protective element  90  blocks the electric current flowing in the reverse direction when a reverse voltage is applied to the light-emitting elements  40 , and prevents overcurrent through the light-emitting elements  40  when a forward voltage higher than the operating voltage of the light-emitting elements  40  is applied to the light-emitting elements  40 . Examples of the protective element  90  include a protection circuit and an electrostatic protection element. More specifically, a Zener diode can be used for the protective element  90 . 
     Methods of Manufacturing Light-Emitting Device 
     Next, two methods of manufacturing the light-emitting device according to the first embodiment will be described. 
     First Method of Manufacturing 
       FIG. 6  is a flowchart illustrating a first method of manufacturing the light-emitting device according to the first embodiment.  FIG. 7A  is a schematic cross-sectional view taken along the line VIIA-VIIA of  FIG. 2 , showing the base member on which the light-emitting elements are mounted in the manufacturing of the first method of manufacturing the light-emitting device according to the first embodiment.  FIG. 7B  is a schematic cross-sectional view taken along the line VIIB-VIIB of  FIG. 3 , showing the base member on which the first members are disposed in the manufacturing process of the first method of manufacturing the light-emitting device according to the first embodiment.  FIG. 7C  is a schematic cross-sectional view taken along the line VIIC-VIIC of  FIG. 4 , showing the base member on which the frame is disposed in the manufacturing process of the first method of manufacturing the light-emitting device according to the first embodiment.  FIG. 7D  is a schematic cross-sectional view for illustrating a method for disposing the second member in the manufacturing process of the first method of manufacturing the light-emitting device according to the first embodiment. In  FIG. 7A  to  FIG. 7C , illustration of wires is omitted. 
     As shown in  FIG. 6  and  FIG. 7A  to  FIG. 7D , the method of manufacturing a light-emitting device  10  includes Step S 1  of mounting light-emitting elements  40  on an upper surface of a base member  20  including the a lead  20 A, a second lead  20 B, and a securing member  20 C securing the first lead  20 A and the second lead  20 B; Step S 2  of disposing one or more first members  30  containing a reflective material on the upper surface of the base member  20  to surround the light-emitting elements  40  and cover at least a portion of the upper surface of the securing member  20 C; Step S 3  of disposing the frame  50  on the upper surface of the base member  20  such that the frame  50  is in contact with the inner lateral surfaces of the first members  30  and the upper surface of the base member  20 , has a height from the base member  20  greater than the height of the first members  30  in a cross-sectional view, and surrounds the light-emitting elements  40 ; and Step S 4  of disposing the second member  70  to cover the light-emitting elements  40 , the frame  50 , and the first members  30 . The steps will be described below. 
     (1) Step S 1  of Mounting Light-Emitting Elements 
     As shown in  FIG. 7A , in Step S 1  of mounting light-emitting elements, the light-emitting elements  40  are mounted on the upper surface of the base member  20  in which the securing member  20 C secures the first lead  20 A and the second lead  20 B. The light-emitting elements  40  are preferably mounted on the mounting portion  21 A of the first lead  20 A. 
     In Step S 1  of mounting light-emitting elements, two light-emitting elements  40  (see  FIG. 1A ) are mounted on the base member  20  using a known technique, and the lower surfaces of the two light-emitting elements  40  on the element substrate  41  are bonded to the upper surface of the base member  20  using known bonding members. Next, an n-electrode  43  of one of the light-emitting elements  40  (a first light-emitting element  40 ) is electrically connected to the first lead  20 A by a wire  60  as shown in  FIG. 1A . The p-electrode  44  of the other of the light-emitting elements  40  (a second light-emitting element  40 ) is electrically connected to the second lead  20 B by a wire  60 . In addition, the p-electrode  44  of the first light-emitting element  40  is electrically connected to the n-electrode  43  of the second light-emitting element  40  by a wire  60 . The protective element  90  may be electrically connected to the first lead  20 A by a wire  60 . A known technique such as ball bonding or wedge bonding may be employed for the wire bonding. 
     (2) Step S 2  of Disposing First Members 
     As shown in  FIG. 7B , in Step S 2  of disposing first members, the first members  30  containing the reflective material are disposed on the upper surface of the base member  20 . Step S 2  of disposing first members is performed before Step S 3  of disposing a frame, which allows for facilitating recognition of the areas in which the first members  30  are to be disposed on the upper surface of the base member  20 , so that the first members  30  can be accurately disposed. Recognition of the positions of the leads is required when the first members are applied to the base member  20 . Performing Step S 2  of disposing first members before Step S 3  of disposing a frame allows for reducing positional information of the leads, so that the positions of the leads can be accurately recognized. 
     In Step S 2  of disposing first members, when the base material of the first members  30  is a resin, the first members  30  with the uncured base resin are injected to be disposed on the upper surface of the base member  20  using a known method, to surround the two light-emitting elements  40  (see  FIG. 1A ) and to cover at least a portion of the upper surface of the securing member  20 C. The first members  30  may be cured together with the frame  50  in subsequent Step S 3  of disposing a frame, or may be cured before Step S 3  of disposing a frame. Adjusting the viscosity of the first members  30  in the uncured state allows for adjusting the shape of the inclined regions  31  of the first members  30  in the cured state in a cross-sectional view to be a convex or concave curved shape (see  FIG. 1C ,  FIG. 1D , and  FIG. 1F ) or a flat shape. 
     In Step S 2  of disposing first members, solid bodies made of a resin or a ceramic may be produced and disposed on the upper surface of the base member  20  to cover at least a portion of the upper surface of the securing member  20 C. 
     The first members  30  may be continuously or intermittently injected. In the case of discontinuous pouring, the first members  30  may be just poured respectively in the four corners of the securing member  20 C or may be poured on the portions connecting the four corners of the securing member  20 C after pouring the first members  30  respectively in the four corners of the securing member  20 C such that the first members  30  are connected to each other in an annular manner in a top view. 
     (3) Step S 3  of Disposing Frame 
     As shown in  FIG. 7C , in Step S 3  of disposing a frame, the frame  50  is disposed on the upper surface of the base member  20 . In Step S 3  of disposing a frame, the frame  50  with the uncured base resin is injected to be disposed on the upper surface of the base member  20  such that the frame  50  surrounds the two light-emitting elements  40  (see  FIG. 1A ), such that the frame  50  is in contact with the inner lateral surfaces of the first members  30  and the upper surface of the base member  20 , and such that the frame  50  has a height from the base member  20  greater than a height of the first members  30  in a cross-sectional view. The frame  50  is then cured. The frame  50  is disposed such that the lower end of the outer lateral surface of the frame  50  is in contact with the upper ends of the first members  30  in  FIG. 7C . Meanwhile, the lower end of the outer lateral surface of the frame  50  may be in contact with the outer lateral surfaces of the first members  30  located outward of the upper ends of the first members  30  (that is, in contact with the inclined regions  31  of the first members  30 ), or the lower end of the outer lateral surface of the frame  50  may be in contact with the inner lateral surfaces of the first members  30  located inward of the upper ends of the first members  30 . In the case in which the frame  50  is disposed such that the lower end of the outer lateral surface of the frame  50  is in contact with the outer lateral surfaces of the first members  30  located outward of the upper ends of the first members  30 , the contact area between the first members  30  and the frame  50  can be increased, and adhesion between the first members  30  and the frame  50  can be improved. 
     (4) Step S 4  of Disposing Second Member 
     As shown in  FIG. 7D , in Step S 4  of disposing a second member, the second member  70  is disposed to cover the light-emitting elements  40 , the frame  50 , and the first members  30 . In Step S 4  of disposing a second member, the second member  70  may be disposed to cover at least a portion of each of the first lead  20 A and the second lead  20 B outside the first members  30 . 
     In Step S 4  of disposing a second member, the second member  70  is preferably disposed using, for example, transfer molding. In the transfer molding, an upper die  101  defining a recess having a shape corresponding to the second member  70 , such as a shape corresponding to the lens portion  71  and the flange portion  72 , is disposed on the upper surface of the base member  20  such that the recess covers the light-emitting elements  40 , the frame  50 , and the first members  30 . Next, a lower die  102  is disposed to cover the lower surface of the base member  20 , on which the light-emitting elements  40 , the frame  50 , and the first members  30  are not disposed. In this arrangement, the edge of the recess of the upper die  101  corresponding to the lens portion  71  is located outside the frame  50 , and the frame  50  is preferably not in contact with the surface defining the recess of the upper die  101 . After that, unhardened resin or glass to become the second member  70  is injected into the recess through an inlet  101   a  and hardened. The second member  70  covering the light-emitting elements  40 , the frame  50 , and the first members  30  is thus disposed on the upper surface of the base member  20 . The second member  70  may be disposed to also cover at least a portion of each of the first lead  20 A and the second lead  20 B outside the first members  30 . 
     Second Manufacturing Method 
       FIG. 8  is a flowchart of a second method of manufacturing the light-emitting device according to the first embodiment.  FIG. 9A  is a schematic cross-sectional view of the base member on which the frame is disposed in the manufacturing using the second method of manufacturing the light-emitting device according to the first embodiment.  FIG. 9B  is a schematic cross-sectional view of the base member on which the first members are disposed in the manufacturing using the second method of manufacturing the light-emitting device according to the first embodiment. In  FIG. 9A  and  FIG. 9B , illustration of wires is omitted. 
     The second method of manufacturing the light-emitting device according to the first embodiment is substantially the same as the first method of manufacturing described above (see  FIG. 6 ) except that Step S 3  of disposing a frame is performed before Step S 2  of disposing first members. 
     As shown in  FIG. 9A , in Step S 3  of disposing a frame, the frame  50  with the uncured base resin is injected to be disposed on the upper surface of the base member  20  to surround the light-emitting elements  40 . The frame  50  is preferably cured before Step S 2  of disposing first members. With this operation, the shape of the frame  50  does not change when the first members  30  are formed, and a predetermined shape of the frame  50  can be maintained. The frame  50  with the uncured base resin can be injected to be located on the boundary between the securing member  20 C and the first lead  20 A. 
     As shown in  FIG. 9B , in Step S 2  of disposing first members, the first members  30  containing the reflective material with the uncured base resin are injected to be disposed in contact with the outer lateral surface of the frame  50  and the upper surface of the base member  20 , so as to cover at least a portion of the upper surface of the securing member  20 C exposed at the outer peripheral side of the frame  50  such that the first members  30  have a height from the base member  20  less than a height of the frame  50  in a cross-sectional view. Adjusting the viscosity of the first members  30  allows for adjusting the shape of the inclined regions  31  of the first members  30  in a cross-sectional view to be a convex or concave curved shape in which the height from the base member  20  increases as the distance from the frame  50  decreases (see  FIG. 1E  and  FIG. 1G ) or a flat shape. 
     In the case in which Step S 2  of disposing first members is performed after Step S 3  of disposing a frame, the shape of the inclined regions  31  of the first members  30  in a cross-sectional view is easily controlled. Accordingly, controlling the shape of the first members  30  allows for controlling light distribution of the light-emitting device  10 . In addition, the amount of the first members  30  to be applied can be minimized, so that the manufacturing efficiency can be improved. 
     Second Embodiment 
     Light-Emitting Device 
     A light-emitting device according to a second embodiment will be described.  FIG. 10  is a schematic cross-sectional view of the structure of the light-emitting device according to the second embodiment. The same portions of the structure as those in the light-emitting device according to the first embodiment are indicated by the same reference numerals, and repetitive descriptions thereof may be omitted. 
     As shown in  FIG. 10 , a light-emitting device  10 A includes a third member  80  disposed inward of the frame  50  to cover the light-emitting elements  40  in addition to the structure of the light-emitting device  10 . The second member  70  covers the light-emitting elements  40 , the third member  80 , the frame  50 , and the first members  30 . The third member  80  of the light-emitting device  10 A preferably contains a phosphor. 
     With the third member  80 , entry of dust or the like into the light-emitting device  10 A from the outside can be further reduced, the wires  60  can be protected, so that reliability can be improved. If the third member  80  contains a phosphor, light emitted from the light-emitting elements  40  can be subjected to wavelength conversion, so that the color of light to be extracted can be adjusted. In addition, light that has been subjected to wavelength conversion by the phosphor is nondirectionally emitted in all directions, and light that has been returned from the lens portion  71  and strikes the securing member  20 C exposed at the outer peripheral side of the frame  50  can be increased. The first members  30  cover the upper surface of the securing member  20 C, and the returned light returned from the lens portion  71  is reflected by the first members  30  in the upward and lateralward directions to serve as extracted light. Accordingly, light extraction and the light distribution of the light-emitting device  10 A are improved. 
     Third Member  80   
     The third member  80  covers the light-emitting elements  40  and seals the light-emitting elements  40  inward of the frame  50 . The third member  80  may have a height greater than the height of the frame  50  and have a curved shape in which the center portion of the third member  80  projects upward such that the third member  80  has a greatest height at a location directly above the light-emitting elements  40  and such that the third member is in contact with the inner lateral surface of the frame  50  in a cross-sectional view as shown in  FIG. 10 . This structure allows for obtaining an effect of reducing reflected light generated at the interface between the third member  80  and the second member  70 . Alternatively, the third member  80  may have a height not greater than the height of the frame  50  and be in contact with the inner lateral surface of the frame  50 . 
     A light-transmissive resin or glass may be used for a material of the third member  80 . A resin is preferably used for the third member  80 . In the case in which resins are used for base materials of the first members  30  and the frame  50 , using a resin for the third member  80  allows for improving adhesion between the third member  80  and the first members  30  and adhesion between the third member  80  and the frame  50 . Examples of the resin for the third member  80  include polycarbonate resins, epoxy resins, phenolic resins, silicone resins, acrylic resins, polymethylpentene resins, polynorbornene resins, modified resins of these resins, and hybrid resins each containing one or more of these resins. A dimethyl silicone resin or a phenyl silicone resin, which has good resistance to light, is preferably used for a material of the third member  80 . The third member  80  preferably contains a phosphor and may contain a light-diffusing agent. In the case in which the third member  80  contains a phosphor, the shape of the upper surface of the third member  80  is preferably curved such that a center portion of the upper surface of the third member  80  projects downward to reduce the distance between the phosphor and the light-emitting elements  40  in consideration of the luminous efficacy. 
     Phosphor 
     Particles of a phosphor adapted to be excited by light emitted from the light-emitting elements  40  and to convert wavelength of light emitted from the light-emitting elements  40  or convert wavelength of light reflected by the first members  30  is used for the phosphor. Examples of a phosphor adapted to be excited by a blue or ultraviolet light-emitting element include cerium-activated yttrium-aluminum-garnet phosphors (YAG:Ce); cerium-activated lutetium-aluminum-garnet phosphors (LAG:Ce); europium- and/or chromium-activated nitrogen-containing calcium aluminosilicate phosphors (CaO—Al 2 O 3 —SiO 2 :Eu,Cr); europium-activated silicate phosphors ((Sr,Ba) 2 SiO 4 :Eu); nitride phosphors such as β-SiAlON phosphors, CASN phosphors, and SCASN phosphors; fluoride phosphors such as KSF phosphors; sulfide phosphors; chloride phosphors; silicate phosphors; phosphate phosphors; and quantum-dot phosphors. Combination of such phosphors and blue or ultraviolet light-emitting elements allows for obtaining light-emitting devices  10  configured to emit light having various wavelengths. 
     Light-Diffusing Agent 
     Examples of a material of the light-diffusing agent include titanium oxide, zirconium oxide, aluminum oxide, and silicon oxide. Titanium oxide is preferable because titanium oxide is comparatively stable toward water and the like and has a high refractive index. 
     Methods of Manufacturing Light-Emitting Device 
     Next, two methods of manufacturing the light-emitting device according to the second embodiment will be described.  FIG. 11  is a flowchart of a first method of manufacturing the light-emitting device according to the second embodiment.  FIG. 12  is a flowchart of a second method of manufacturing the light-emitting device according to the second embodiment. Steps that are the same as those in the methods of manufacturing the light-emitting device according to the first embodiment are indicated by the same reference numerals, and repetitive descriptions thereof may be omitted. 
     First Method of Manufacturing 
     As shown in  FIG. 11 , the first method of manufacturing the light-emitting device  10 A further includes Step S 5  of disposing a third member after Step S 3  of disposing a frame in addition to the steps of the method of manufacturing the light-emitting device  10  (see  FIG. 6 ). 
     In the first method of manufacturing the light-emitting device  10 A, the inclined regions  31  of the first members  30  may be curved so as to be convex (see  FIG. 1C  and  FIG. 1D ) to project upward of the base member  20  in a cross-sectional view, or may be curved so as to be concave (see  FIG. 1F ) and to project toward the lower end of the frame  50  in a cross-sectional view. In Step S 4  of disposing a second member, the second member  70  is disposed to cover the light-emitting elements  40 , the third member  80 , the frame  50 , and the first members  30 . 
     The first method of manufacturing the light-emitting device  10 A including Step S 5  of disposing a third member allows for improving reliability of the light-emitting device  10 A and color of extracted light. 
     (1) Step S 5  of Disposing Third Member 
     In Step S 5  of disposing a third member, the third member  80  is disposed inward of the frame  50  to cover the light-emitting elements  40 . The third member  80  is disposed using a known method such as potting or spraying. 
     While the third member  80  has a curved shape in which the center portion of the third member  80  projects upward such that the third member  80  has a greatest height at a location directly above the light-emitting elements  40  in the above description, the third member  80  may have a uniform height or may have a curved shape in which the center portion of the third member  80  projects downward. 
     In the first method of manufacturing according to the second embodiment in which the first members  30  are disposed before the frame  50  is disposed, when manufacturing the light-emitting device  10 A including the rectangular base member  20 , the circular frame  50 , and the first members  30  continuously disposed along the outer periphery of the frame  50  over the entirety of the outer periphery of the frame  50  in a top view, Step S 2  of disposing first members is preferably performed as described below. 
     The amounts of the first members  30  to be injected in Step S 2  of disposing first members are preferably increased at four corners of the securing member  20 C exposed outside the frame  50  and are preferably reduced at positions other than the four corners. In Step S 3  of disposing a frame, the height of the upper end of the frame  50  in contact with the first members  30  varies in a wavy manner over the entire circumference of the frame  50 ; that is, the height of the frame  50  is uneven over the entire circumference of the frame  50 . Further, in Step S 4  of disposing a second member, with the uneven height of the frame  50 , the contact area between the frame  50  and the second member  70  can be increased, and accordingly, adhesion between the frame  50  and the second member  70  can be improved, compared with the case in which the height of the frame  50  is uniform. 
     Second Method of Manufacturing 
     As shown in  FIG. 12 , a second method of manufacturing the light-emitting device  10 A further includes Step S 5  of disposing a third member after Step S 2  of disposing first members, in addition to the steps of the second method of manufacturing the light-emitting device  10  (see  FIG. 8 ). In the second method of manufacturing the light-emitting device  10 A, the inclined regions  31  of the first members  30  may have a concave curved shape (see  FIG. 1G ) projecting toward the lower end of the frame  50  in a cross-sectional view, or may have a convex curved shape (see  FIG. 1E ) in a cross-sectional view. In Step S 4  of disposing a second member, the second member  70  is disposed to cover the light-emitting elements  40 , the third member  80 , the frame  50 , and the first members  30 . 
     With the second method of manufacturing the light-emitting device  10 A including Step S 5  of disposing a third member, the reliability of the light-emitting device  10 A and color of extracted light can be improved. 
     While certain embodiments of the present invention are described above, the scope of the present invention is not limited to these embodiments, but rather should be broadly interpreted on the basis of the claims. The scope of the present invention also encompasses various modifications of the described embodiments.