Patent Publication Number: US-10777719-B2

Title: Base member, and method of manufacturing light emitting device using same

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2018-075401, filed on Apr. 10, 2018, the disclosure of which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     The present disclosure relates to a base member, and a method of manufacturing a light emitting device using the base member. 
     For example. Japanese Patent Publication No. 2011-3853 and Japanese Patent Publication 2014-96550 disclose a collective base member in which a resin molded body is molded integrally with a lead frame. 
     In the above-described base member, a difference between the thermal expansion coefficient of the lead frame and the thermal expansion coefficient of the resin molded body possibly causes warpage of the base member when a light emitting device or the like is manufactured by subjecting the base member to, for example, a step of applying heat, such as a die bonding step or a step of curing an encapsulant. 
     In addition, the base member may be warped not only when the base member is subjected to a step of applying heat but also when the resin molded body is expanded by absorbing moisture. 
     SUMMARY 
     Accordingly, the present disclosure is intended to provide a base member which tends not to be warped, and a method of manufacturing a light emitting device using the base member. 
     The present disclosure includes a base member including a lead frame and a resin molded both in which the lead frame is embedded. The resin molded body and the lead frame define a plurality of recesses arranged in a matrix along a first direction and a second direction orthogonally crossing the first direction in a plan view. The resin molded body has a plurality of bottom surface portions each defining a part of a bottom surface of a corresponding one of the recesses, and a wall portion surrounding each of the bottom surface portions in the plan view, with an upper surface of the wall portion defining at least one a groove portion extending in the first direction or the second direction. 
     The present disclosure further includes a method including: providing the foregoing base member; disposing a light emitting element on the bottom surface of each of the recesses; and cutting the base member at the at least one groove portion to obtain a plurality of light emitting devices. 
     According to the present disclosure, it is possible to provide a base member which tends not to be warped. 
     In addition, using a base member with less possibility of warpage can manufacture a light emitting device with less positional displacement in die bonding or the like. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a schematic plan view of a base member according to certain embodiment of the present disclosure. 
         FIG. 1B  is a schematic sectional view of the base member of  FIG. 1A  as taken along line I-I′. 
         FIG. 1C  is a schematic sectional view of the base member of  FIG. 1A  as taken along line II-II′. 
         FIG. 1D  is a schematic plan view showing a pair of lead portions. 
         FIG. 2A  is a schematic plan view for illustrating a method of manufacturing a light emitting device according to certain embodiment of the present disclosure. 
         FIG. 2B  is a schematic plan view for illustrating the method of manufacturing the light emitting device according to the embodiment of the present disclosure. 
         FIG. 2C  is a schematic plan view for illustrating the method of manufacturing the light emitting device according to the embodiment of the present disclosure. 
         FIG. 2D  is a schematic plan view for illustrating the method of manufacturing a light emitting device according to another embodiment of the present disclosure. 
         FIG. 3A  is a graph showing warpage of a base member according to certain embodiment of the present disclosure. 
         FIG. 3B  is a graph showing warpage of a comparison base member with no groove portion formed. 
         FIG. 4  is a schematic plan view for illustrating a method of manufacturing a light emitting device according to another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be described with reference to the drawings as appropriate. However, a base member and a method of manufacturing a light emitting device, which will be described below, are intended to embody the technical idea of the present disclosure, and the present disclosure is not limited to the following embodiments unless otherwise specified. In addition, the size, the positional relation and the like of the members shown in the drawings may be exaggerated for clarification of explanation. 
     Base Member  10   
     As shown in  FIGS. 1A to 1D , a base member  10  according to certain embodiment of the present disclosure includes a lead frame  11 , and a resin molded body  12  formed integrally with the lead frame  11 . The base member  10  is provided with a plurality of recesses  12 A formed in a first direction and a second direction orthogonally crossing the first direction. The resin molded body  12  has a bottom surface portion  12   b  disposed on the bottom surface of the recess  12 A, and a wall portion  12   w  integrally formed with the bottom surface portion  12   b . The wall portion  12   w  defines the recess  12 A. In addition, the resin molded body  12  is provided with at least one groove portion  13  on upper surfaces between adjacent recesses  12 A, in other words, a portion between upper surfaces  12   u  of the wall portions  12   w  of the recess  12 A. 
     Thus, the groove portion  13  is partially formed on the resin molded body  12  in the base member  10  including the lead frame  11  and the resin molded body  12  having different thermal expansion coefficients. Thus, the groove portion  13  absorbs expansion or shrinkage of the lead frame  11  and the resin molded body  12 , which is caused by heat or the like. As a result, warpage of the base member itself can be alleviated. 
     In the present application, for example, the first direction is a longitudinal direction along which the base member and the lead frame are elongated, and the second direction is a width direction orthogonally crossing the first direction. In the lead frame, a plurality of pairs of lead portions (i.e., portions which form a pair of leads after division) is continued and arranged for forming a plurality of light emitting devices, and the base member is formed by embedding some of the plurality of pairs of lead portions in the resin molded body  12 . Light emitting elements and the like are disposed on the base member, and thereafter the base member is cut along the first direction and the second direction, to thereby obtaining individual light emitting devices. 
     Lead Frame  11   
     The lead frame  11  is formed by arranging the plurality of pairs of lead portions in the first direction and the second direction, and embedding some of the pairs of lead portions in the resin molded body  12 . Parts of the upper surfaces of a pair of lead portions are both exposed at the bottom surface of the recess  12 A. 
     The lead frame  11  is composed of a flat plate of copper, aluminum, gold, silver, tungsten, iron, nickel, cobalt, molybdenum or an alloy thereof, with the flat plate subjected to various kinds of processing such as pressing (including punching), etching and rolling. The lead frame  11  may be configured by a multilayer of these metals or alloys, or a single layer. In particular, copper, or a copper alloy mainly containing copper (e.g., phosphor bronze, copper-iron alloy or the like) is preferable. Accordingly, the heat dissipation property of the lead frame  11  can be improved. The lead flame may have a plated layer on a surface thereof, which is formed using silver, gold, copper, nickel, aluminum, palladium, rhodium, an alloy thereof or the like. In particular, preferably, the surface of the lead frame is provided with a plated layer of silver or a silver alloy, which has good light-reflectivity. The thickness (i.e., plate thickness) of the lead flame  11  is, for example, in a range of 0.05 mm to 1 mm, preferably 0.1 mm to 0.4 mm, more preferably 0.1 mm to 0.3 mm. 
     The pairs of lead portions may have various shapes. In particular, preferably one lead portion and the other lead portion in the each pair of lead portions are exposed at the bottom surfaces of recesses  12 A with substantially the same surface area. Accordingly, at the time when stress such as warpage is applied to the base member  10 , the stress is likely to be uniformly applied to the lead portions. This can reduce the possibility of concentrating stress on only some regions in the base member  10 . 
     Preferably, a partially thin portion  11 X is formed along the outer periphery on the lower surface of the lead portion as shown with a cross hatching in  FIG. 1D . Accordingly, adhesion with the resin molded body  12  can be improved. In  FIG. 1D , a level difference on the lower surface of the lead frame  11 , which defines a boundary between the partially thin portion  11 X and other portion of the lead frame, is represented by a broken line. In addition, a groove  11 Y may be formed on the upper surface of the lead portion positioned as shown with a diagonal hatching in  FIG. 1D . The groove  11 Y may be positioned below the wall portion of the resin molded body. Accordingly, adhesion between the resin molded body and the lead frame can be further improved. For example, the groove  11 Y may have a structure in which the groove  11 Y has an unpierced bottom, or a structure in which the groove  11 Y pierces the lead frame from the upper surface to the lower surface. 
     Resin Molded Body  12   
     The resin molded body  12  is formed integrally with the lead frame with the lead frame at least partially embedded in the resin molded body  12 . Preferably, the lower surface of the lead frame is exposed from the resin molded body  12 . This can dissipate heat from the lower surface of the lead frame when heat is applied to the base member. The resin molded body  12  is formed with a plurality of recesses  12 A which is defined by the resin molded body  12  and the lead frame  11  in the first direction and the second direction for accommodating light emitting elements. Preferably, the recesses  12 A are arranged at substantially equal intervals in the first direction or the second direction. 
     The recess  12 A is defined by a pair of lead portions and the resin molded body  12 . The upper surfaces of a pair of lead portions are exposed at the bottom surface of the recess  12 A. The bottom surface portion  12   b  forming a part of the resin molded body  12  configures as a part of the recess  12 A. The resin molded body is integral with the bottom surface portion  12   b , and has the wall portion  12   w  continuing from the bottom surface portion  12   b . The wall portion  12   w  forms lateral surfaces  12   s  inside the recess  12 A. The height of the wall portion  12   w  or the lateral surfaces  12   s  is, for example, in a range of 0.2 mm to 1 mm, preferably 0.2 mm to 0.8 mm, more preferably 0.2 mm to 0.5 mm. The lateral surfaces  12   s  of the all portion  12   w  may be perpendicular or inclined to the upper surface of the lead frame. The degree of inclination can be appropriately determined. 
     The resin molded body  12  has the upper surface  12   u  positioned between adjacent recesses. The upper surfaces  12   u  each extend with a predetermined width in both the first direction and the second direction. In the present embodiment, the upper surfaces preferably have a constant width, but may partially have different widths. In addition, the width in the first direction and the width in the second direction are not necessarily required to be the same, and may be different. For example, the width of the upper surface  12   u  is 0.1 μm to 1 μm, preferably 0.3 μm to 0.7 μm. 
     The resin molded body  12  is provided with the groove portion  13  formed in the upper surface  12   u  between adjacent recesses  12 A in top view. The groove portion  13  preferably extends in at least one of the first direction and the second direction. More preferably, the groove portion  13  extends in both the first direction and the second direction. 
     Preferably, the groove portion  13  is formed continuously from one end to the other end of the resin molded body in the first direction and the second direction in top view. Accordingly, warpage of the base member  10  can be effectively alleviated. The groove portion  13  may be formed only partially between one end and the other end at the resin molded body in the first direction or the second direction in top view. In each of the first direction and/or the second direction, the groove portion  13  may be formed in one row, or in two or more rows. 
     The groove portion  13  in the first direction and the groove portion  13  in the second direction may have the same width, but preferably have different width. For example, as shown in  FIG. 4 , it is preferable that the width of the groove portion extending in the first direction (see line Y) is smaller than the width of the groove portion extending in the second direction (see line X). The width of the groove portion  13  is, for example, in a range of 0.1 mm to 1 mm, preferably 0.1 mm to 0.8 mm, more preferably 0.15 mm to 0.6 mm. 
     For example, the depth of the groove portion  13  with respect to the maximum thickness of the resin molded both is preferably 30% to 80%, more preferably 30% to 60%. Specifically, the depth of the groove portion  13  is, for example, in a range of 0.1 mm to 0.5 mm, preferably 0.1 mm to 0.4 mm, more preferably 0.15 mm to 0.35 mm. 
     In the light emitting device provided with the groove portion, the groove portion absorbs stress caused by thermal expansion or shrinkage between the lead frame and the resin molded body having different thermal expansion coefficients. As a result, warpage of the base member, which is caused by stress resulting from thermal expansion or shrinkage, can be effectively suppressed. In particular, in a die-bonding step of a light emitting element or an encapsulant disposing step in which heat is applied to the base member, a difference in thermal expansion or shrinkage between the lead frame and the resin molded body is noticeable. In such a step, warpage of the base member can be further effectively alleviated when the base member is provided with the groove portion. 
     The resin molded body is preferably a member having high light-reflectiveness. The high light-reflectiveness means that a light emitting element mounted on the base member has a light-reflectivity of 50% or more at a peak emission wavelength. The light-reflectiveness of the resin molded body is preferably at least 75%, more preferably at least 90%. In addition, the resin molded body is preferably white. The resin molded body preferably has a flowability, i.e., a liquid state, a sol state, a slurry state or the like, before the resin molded body is solidified. The resin molded body can be molded by an injection molding method, a transfer molding method or the like. 
     For the resin molded body, a thermosetting resin or a thermoplastic resin can be used as a resin material that is a base material. Specifically preferable example of a resin material for the resin molded body include a thermosetting resin such as an epoxy resin or a silicone resin, which is good in heat resistance and light resistance. 
     Examples of the thermosetting resin include epoxy resins, silicone resins, polyimide resins, polyurethane resins, polybismaleimide-triazine resins, unsaturated polyester, and modified resins or hybrid resins thereof. Among them, epoxy resins, silicone resins, unsaturated polyester, and modified resins or hybrid resins thereof are preferable. In particular, it is preferable that a thermosetting resin such as an epoxy resin or a silicone resin, which is good in heat resistance and light resistance, is used as a resin material for the resin molded body. 
     Examples of the thermoplastic resin include cycloaliphatic polyamide resins, semi-aromatic polyamide resins, polyethylene terephthalate, polycyclohexane terephthalate, liquid crystal polymers, polycarbonate resins, syndiotactic polystyrene, polyphenylene ether, polyphenylene sulfide, polyether sulfone resins, polyether ketone resins, polyarylate resins, and modified resins or hybrid resins thereof. Among them, cycloaliphatic polyamide resins, polycyclohexane terephthalate, and modified resins or hybrid resins thereof are preferable. 
     Preferably, the resin molded body contains a white pigment and/or a filling agent and the like in the above-described resin from the viewpoint of light-reflectiveness, mechanical strength, thermal expansion property and so on. 
     Examples of the white pigment include titanium oxide, zinc oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, barium titanate, barium sulfate, aluminum hydroxide, aluminum oxide and zirconium oxide. These white pigments can be used singly, or in combination of two or more thereof. Among them, titanium oxide is preferable because it has a relatively high refractive index, and is good in light shielding property. The shape of the white pigment may be irregular form such as crushed shape, but is preferably spherical from the viewpoint of flowability. 
     Examples of the filling agent include silica, aluminum oxide, glass, potassium titanate, wollastonite (e.g., calcium silicate), mica and talc. These filling agents can be used singly, or in combination of two or more thereof. The shape of the filling agent may be irregular form such as crushed shape, but is preferably fibrous or tabular (e.g., scaly) from the viewpoint of a function as a reinforcing agent, or preferably spherical from the viewpoint of flowability. 
     The base member  10  is formed by a method known in the art, for example, a method in which a lead frame processed into a predetermined shape is sandwiched between upper and lower molds, a resin to be formed into a resin molded body is poured into the upper and lower molds, and the resin is solidified. 
     The groove portion is formed by, for example, removing only a part of the resin molded body along the first direction and/or the second direction using a blade having a predetermined thickness. In addition, in a mold for forming a resin molded body on a lead frame, an upper mold having a projection at a predetermined part corresponding to a groove portion may be prepared, followed by forming the groove portion concurrently with forming a base member. 
     Method of Manufacturing Light Emitting Device 
     Certain embodiment of the method of manufacturing a light emitting device includes: providing the base member  10  shown in  FIGS. 1A to 1D ; disposing a light emitting element  14  on the bottom surface of the recess  12 A of the base member  10  as shown in  FIGS. 2A and 2B ; and cutting the base member  10  at at least one groove portion as shown in  FIG. 2B . 
     As shown in  FIG. 2C , a plurality of light emitting devices  20  can be obtained through these steps. 
     The base member described in the present embodiment is the same as or similar to the base member  10  described above. In the cutting step, the width of a cutting tool and the width of the groove portion  13  may be the sane, or different. Preferably, the width of the cutting tool is larger than the width of the groove portion  13 . In the light emitting device  20  obtained by dividing the base member using such a cutting tool, a trace of the groove portion  13  does not remain on the outside surface of the light emitting device  20 . Accordingly, a light emitting device having a smooth or flush outside surface can be obtained. In addition, cutting the base member  10  along the groove portion  13  can reduce stress of cutting the base member  10 . This can alleviate deformation and warpage of the base member  10 . 
     Preferably, the method of manufacturing a light emitting device includes a heating step of heating the base member after providing the base member  10  and before cutting the base member  10 . Examples of the heating step include a die bonding step in which a light emitting element is mounted on a lead frame, and a resin curing step in an encapsulant disposing step as described later. In particular, the groove portion  13  in the base member  10  can effectively alleviate warpage of the base member  10  by acting to release stress caused by thermal expansion or shrinkage between the lead frame  11  and the resin molded body  12  before and after the heating step. 
     Mounting of Light Emitting Element  14  in Recess  12 A 
     A plurality of light emitting elements  14  is provided, and the light emitting elements  14  are mounted on the bottom surface of the recess  12 A as shown in  FIGS. 2A and 2B . 
     For the light emitting element  14 , a semiconductor light emitting element such as an LED element can be used. The light emitting element may have an element structure composed of various semiconductors, and a pair of positive and negative electrodes. In particular, a light emitting element of nitride semiconductor (In x Al y Ga 1−x−y N, 0≤x, 0≤y, x+y≤1) capable of emitting light in an ultraviolet-to-visible region is preferable. In addition, the light emitting element may be a light emitting element of gallium arsenide-based semiconductor or gallium phosphide-based semiconductor, which emits green-to-red light. 
     A pair of positive and negative electrodes may be disposed on the same surface side of the element structure, or on different surface sides, respectively, on the element structure. The light emitting element with the electrodes provided on the same surface side may be mounted either by face-up mounting or by flip-chip-mounting. In the light emitting element with the electrodes respectively provided on different surface sides, the lower surface electrode is connected to one lead with an electrically conductive adhesive, and the upper surface electrode is connected to the other lead with a wire. 
     One or more light emitting elements may be mounted in one recess. For example, three light emitting elements which respectively emit blue light, green light and red light may be mounted in one recess, or two light emitting elements which respectively emit blue light and green light, may be mounted in one recess. A plurality of light emitting elements can be connected in series or in parallel with a wire. 
     For example, a wavelength conversion member  16  may be disposed on the upper surface of the light emitting element  14 . Accordingly, it is possible to obtain a light emitting device  20 A capable of emitting light with various wavelengths as shown in  FIG. 2D . Preferably, the wavelength conversion member  16  contains, for example, the above-described light-transmissive resin and a fluorescent material. In this case, an encapsulant  15   a  is not required to contain a fluorescent material. 
     As described above, a pair of lead portions is both partially exposed at the bottom surface of the recess of the base member. Thus, it is preferable that the light emitting element is mounted on one or both of the lead portions, and bonded. For example, the light emitting element is preferably flip-chip-mounted on the upper surfaces of both the lead portions. Bonding can be performed using, for example, a bonding member such as: a bump of gold, silver, copper or the like; a metal paste containing metal powder of silver, gold, copper, platinum, aluminum, palladium or the like and a resin binder; solder such as tin-bismuth-based solder, tin-copper-based solder, tin-silver-based solder, gold-tin-based solder or the like, or a brazing material such as a low-melting-point metal. 
     In addition, it is preferable that after the light emitting element  14  is mounted on the bottom surface of the recess  12 A, an encapsulant  15  is formed in the recess  12 A as shown in  FIG. 2B . The encapsulant  15  protects the light emitting element  14  from dust, moisture, an external force and the like by encapsulating the light emitting element  14 . The encapsulant  15  may be electrical insulation, and is transmissive to light emitted from the light emitting element, with a light transmittance of preferably at least 70%, more preferably at least 85% at a light emission peak wavelength of the light emitting element. Examples materials of the encapsulant include silicone resins, epoxy resins, phenol resins, polycarbonate resins, acrylic resins, TPX resins, polynorbornene resins and modified resins or hybrid resins thereof. Among them, silicone resins and modified resins or hybrid resins thereof are preferable because they are good in heat resistance and light resistance, and have small volumetric shrinkage after being cured. The encapsulant  15  may contain a fluorescent material. 
     The fluorescent material absorbs at least a part of primary light emitted from the light emitting element, and emits secondary light having a wavelength different from that of primary light. Examples of yttrium aluminum garnet activated by cerium, nitrogen-containing calcium aluminosilicate activated by europium and/or chromium, SiAlON activated by europium, silicate activated by europium, potassium fluorosilicate activated by manganese, quantum dots, or the like. The quantum dots are particles having a particle size of in a range of about 1 nm to 100 nm, and are capable of changing a light emission wavelength according to a particle size. Examples of the quantum dots include those of cadmium selenide, cadmium telluride, zinc sulfide, cadmium sulfide, lead sulfide, lead selenide and cadmium mercury telluride. These fluorescent materials can be used singly, or in combination of two or more thereof. This can provide a light emitting device which emits mixed-color light (e.g. white light) of primary light and secondary light with a visible wavelength. 
     Cutting of Base Member  10   
     A plurality of light emitting devices can be obtained by cutting the base member  10  as shown in  FIGS. 2A and 2B . In cutting of the base member  10 , it is preferable to cut the resin molded body  12  and the lead frame  11  simultaneously. 
     Cutting the base member can be performed, for example, by cutting the base member so as to pass through the center of the groove portion using a blade having a predetermined width. In this step, it is preferable to use a blade having a width larger than that of the blade used for forming the groove portion. For example, the width of the blade is in a range of 0.1 mm to 0.5 mm, preferably 0.2 mm to 0.4 mm. The cutting can be performed by using laser light or the like instead of using the blade. 
     Cutting the base member along the groove portion  13  (see lines X and Y in  FIGS. 2A and 2B ) can reduce the ratio at which the trace of the groove portion  13  remains in the light emitting device after division, or the trace of the groove portion  13  does not remain in the light emitting device after division. This can provide a light emitting device having a cut surface having a small step difference, or a light emitting device having a flat cat surface. 
     First Embodiment 
     Base Member 
     A base member  10  of this embodiment includes a lead frame  11  and a resin molded body  12  as shown in  FIGS. 1A to 1D . 
     The lead frame  11  is a metal plate having a copper base material subjected to punching processing, and a silver plating applied to a surface of the base material. The lead frame  11  has a substantially rectangular, shape having a length in a range of 75 mm and 61 mm in a first direction (i.e., longitudinal direction) and a second direction (i.e., width direction) respectively, and has a thickness of 0.2 mm. 
     The resin molded body  12  is configured, for example, with an epoxy-based resin containing 10% by weight to 20% by weight of titanium oxide as a white pigment and 60% by weight to 70% by weight of spherical silica as a filling agent. 
     In the resin molded body  12 , a Zener diode is disposed as a protective element. 
     At least one groove portion  13  extends along the first direction and the second direction on an upper surface  12   u  between recesses  12 A. The groove portion  13  has a width of 0.15 mm and a depth of 0.3 mm in the first direction. The groove portion  13  has a width of 0.15 mm and a depth of 0.3 mm in the second direction. 
     As a comparison with the present disclosure, a base member was prepared with the same structure as the base member described above except for that no groove portion was formed. 
     The above-described base member and the comparative base member were subjected to the die-bonding step of a light emitting element and the encapsulant disposing step, which involved a heating step. 
     As a result, as shown in  FIG. 3B , considerable warpage was observed in the base member with no groove portion such that the base member was warped by about −0.6 mm particularly in the longitudinal direction. 
     On the other hand, as compared to the warpage shown in  FIG. 3B , warpage of the base member  10  provided with groove portions was considerably reduced as shown in  FIG. 3A . 
     Thus, in the base member  10  provided with a groove portion on the upper surface of the resin molded body, stress resulting from a difference in thermal expansion coefficient between the lead frame  11  and the resin molded body  12  can be effectively absorbed by the groove portion  13  of the resin molded body  12  even when the base member  10  is subjected to the die bonding step of a light emitting element and the encapsulant disposing step or the like, which involve a heating step. As a result, it has been confirmed that warpage of the base member can be effectively alleviated. 
     Second Embodiment 
     Method of Manufacturing Light Emitting Device 
     In a method of manufacturing a light emitting device according to a second embodiment, the base member  10  is provided as shown in  FIGS. 1A to 1D . On a pair of leads exposed in a recess  12 A of the base member  10 , a light emitting element  14  is flip-chip-mounted with an Au/Sn paste as shown in  FIGS. 2A and 2B , in this die bonding step, the base member  10  is heated at, for example, 320° C. 
     Subsequently, for example, a resin material in which 80% by weight of a KSF fluorescent material is contained in a phenyl silicone resin is supplied in the recess  12 A of the base member  10  so as to fully cover the light emitting element  14 , and heated at 150° C. for 3 hours to form an encapsulant  15 . 
     Thereafter, the base member  10  is cut along a groove portion  13 . 
     Through these steps, as shown in  FIG. 2C , it is possible to obtain a light emitting device  20  with smooth lateral surfaces configured with a resin molded body  12  and the lead flush with each other. 
     In addition, even when heating treatments in these steps are performed, the base member  10  is less likely to warped, to thereby achieve a light emitting device with high positional accuracy and high desirable quality. 
     As a modification of the light emitting device, a light emitting device  20 A can be provided. The light emitting device  20 A includes the encapsulant  15   a  containing substantially no fluorescent material, and a light emitting element  14  on which a wavelength conversion member  16  is disposed, as shown in  FIG. 2D . The light emitting device  20 A can achieve the same effect as described above. 
     The base member and the method of manufacturing a light emitting device according to the present disclosure can be used for manufacturing light emitting devices to be used for backlight devices of liquid crystal displays, various lighting fixtures, large displays, various display devices for advertisement, destination guide and the like, projector devices, image reading devices in, for example, digital video cameras, facsimile machines, copy machines and scanners, and the like.