Patent Publication Number: US-2022238775-A1

Title: Light-emitting device and method for manufacturing light-emitting device

Description:
TECHNICAL FIELD 
     One aspect of the present invention relates to a light-emitting device. Another aspect of the present invention relates to a method for making a light-emitting device. 
     BACKGROUND ART 
     Carbon dioxide and methane are environmental gases having absorption in an infrared region. It is desired to analyze these environmental gases with high sensitivity. To meet this desire, a light-emitting device emitting infrared light with high output has been in a process of development. High-output infrared light having a wavelength region of, for example, 3 to 5 μm is obtained by focusing light from a light source including, for example, a light-emitting diode. However, it is not practical from an economic point of view to use a lens as an element focusing infrared light. High-output infrared light is effectively obtained through a reflector as the element focusing infrared light from the light source. 
     Some proposals have been made for a device focusing light from a light source through a reflecting mirror. Patent Literature 1 discloses a light-emitting device. The light-emitting device includes a light-emitting diode, a phosphor that wavelength-converts light from the light-emitting diode to generate white light, a reflecting plate that reflects the white light, a transparent plate that emits the white light from the reflecting plate to the outside, and a case housing the light-emitting diode, the phosphor, the reflecting plate, and the transparent plate. Patent Literature 2 discloses a light-emitting diode. The light-emitting diode includes a light-emitting diode element and a metal reflecting mirror that reflects light from the light-emitting diode element. Patent Literature 3 discloses a light-emitting diode lamp. The light-emitting diode lamp includes a light-emitting diode chip, a reflection surface of a concave curved surface that reflects light from the light-emitting diode chip, a light transmissive substrate that transmits light from the reflection surface to the outside, and a fixed cover that covers these ones. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: Japanese Unexamined Patent Publication No. 2000-347601 
         Patent Literature 2: Japanese Unexamined Patent Publication No. 2002-280614 
         Patent Literature 3: Japanese Unexamined Patent Publication No. H10-335706 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     A light-emitting element including a light-emitting diode emits light upon receiving electric power supplied from an electric power supply. For this reason, a light output of the light-emitting element may be reduced, and a life of the light-emitting element may be shortened by a heat generated in the light-emitting element due to light emission and a heat from an electric line portion that transmits the electric power. It is important to effectively dissipate the heat generated in the light-emitting element. 
     In the light-emitting device of Patent Literature 1, the transparent plate is disposed on the case to cover an entire one surface of the case. Therefore, the transparent plate tends not to dissipate the heat generated in the light-emitting diode to the outside of the case effectively. In the light-emitting diode of Patent Literature 2, the amount of electrodes that perform a heat dissipation function is small. Therefore, the heat generated in the light-emitting diode element tends not to be dissipated toward the outside of the light-emitting diode. In the light-emitting diode lamp of Patent Literature 3, a wire (lead) that supplies power to the light-emitting diode chip is positioned in the fixed cover that covers the light-emitting diode chip. The wire is not exposed to the outside of the fixed cover, and thus the wire tends not to dissipate the heat generated in the light-emitting diode chip. 
     An object of one aspect of the present invention is to provide a light-emitting device that effectively dissipates heat generated in a light source. An object of another aspect of the present invention to provide a method for making a light-emitting device that effectively dissipates heat generated in a light source. 
     Solution to Problem 
     A light-emitting device according to one aspect includes: a light source; a window mounting the light source; and a package defining a space with the window, the light source being disposed in the space. The window includes: a window base including a light exit surface, a lower surface opposing the light exit surface, and a side surface coupling the light exit surface and the lower surface; and an electrically conductive body disposed on the lower surface of the window base. The package includes: a base portion formed with a recess open toward the lower surface, the base portion including a placement surface disposed along an edge of the recess and opposing the lower surface, a bottom surface opposing the placement surface, and an outer side surface coupled to the bottom surface; a wall portion including an inner wall surface coupled to the placement surface and opposing the side surface, an outer wall surface opposing the inner wall surface and coupled to the outer side surface, and an upper wall surface coupling the inner wall surface and the outer wall surface, the wall portion disposed along the window base when viewed from a direction orthogonal to the light exit surface; a reflection portion disposed on a surface of the recess, being configured to reflect light emitted from the light source to the window; and an electric conductor disposed on the placement surface, the inner wall surface, the upper wall surface, the outer wall surface, and the outer side surface. The window base is configured to transmit the light reflected on the reflection portion. The electrically conductive body includes a plurality of first pads opposing the placement surface, and a plurality of connectors electrically connecting the light source and the plurality of first pads. The electric conductor includes a plurality of second pads disposed on the placement surface to oppose corresponding first pads of the plurality of first pads and electrically connected to the corresponding first pads. 
     According to the one aspect, the light source mounted on the window emits light to the reflection portion disposed in the recess open toward the lower surface of the window base. The reflection portion reflects the light to the window. The window transmits the light reflected on the reflection portion toward the outside. The reflection portion is disposed on the surface of the recess, and thus the light to be reflected is focused due to the recessed shape of the reflection portion. As a result, the light transmitted through the window has an improved light density, and the improved light density provides the light-emitting device for analyzing the environmental gas with high sensitivity. 
     In the one aspect, the light source is electrically connected to the plurality of first pads through the plurality of connectors. The plurality of first pads are electrically connected to the electric conductor through the corresponding second pads. The light source is electrically connected to the electric conductor through the first pad and the second pad. The electric conductor is disposed on the placement surface, the inner wall surface, the upper wall surface, the outer wall surface, and the outer side surface. This disposal of the electric conductor provides a large area in contact with the outside of the light-emitting device. The heat generated in the light source due to the supply of power is effectively dissipated through the electric conductor having the large area in contact with the outside. 
     In the one aspect, the electric conductor may be further disposed on the bottom surface. 
     The configuration in which the electric conductor is disposed on the bottom surface further increases the area where the electric conductor is in contact with the outside of the light-emitting device. As a result, this configuration further improves heat dissipation through the electric conductor. 
     In the one aspect, a height from the placement surface to the upper wall surface may be larger than a height from the placement surface to the light exit surface. 
     In the configuration in which the height from the placement surface to the upper wall surface is larger than the height from the placement surface to the light exit surface, the wall portion disposed along the window base prevents the window base from coining into contact with an external object of the light-emitting device. Damage to the window base is reduced, and thus the window base favorably transmits the light reflected on the reflection portion toward the outside. On the inner wall surface, the electric conductor is disposed in a region from the placement surface to the upper wall surface. Therefore, this disposal further improves the heat dissipation through the electric conductor. 
     In the one aspect, the package may have a polygonal shape when viewed from the direction orthogonal to the light exit surface. The number of the outer side surfaces and the outer wall surfaces may be plural, respectively. The electric conductor may not be disposed on the corner portion defined by the upper wall surface and the outer wall surfaces adjacent to each other, on a ridge portion defined by the outer wall surfaces adjacent to each other, and on a ridge portion defined by the outer side surfaces adjacent to each other. 
     The configuration in which the electric conductor is not disposed on the corner portion and the ridge portion of the package reduces peeling of the electric conductor starting from the corner portion and the ridge portion. 
     In the one aspect, the electric conductor may be disposed on the upper wall surface such that the ratio of the area of the electric conductor to the area of the upper wall surface is 50% or more. 
     The configuration in which the ratio of the area of the electric conductor to the area of the upper wall surface is 50% or more enhances the heat dissipation through the electric conductor. 
     In the one aspect, the electric conductor may be disposed on the outer wall surface and the outer side surface such that the ratio of the area of the electric conductor to the sum of the area of the outer wall surface and the area of the outer side surface is 50% or more. 
     The configuration in which the ratio of the area of the electric conductor to the sum of the area of the outer wall surface and the area of the outer side surface is 50% or more further enhances the heat dissipation through the electric conductor. 
     In the one aspect, the window may include a dummy pad disposed on the lower surface and mounting the light source. 
     The light source is stably mounted on the window through the dummy pad. The dummy pad mounts the light source, and thus the dummy pad efficiently receives and dissipates the heat generated in the light source. 
     In the one aspect, each of the connectors may include a third pad mounting the light source, and the electrically conductive line electrically connecting the first pad and the third pad. 
     The light source is mounted through the third pad, and the first pad and the third pad are electrically connected through the electrically conductive line. The light source is mounted on the third pad, and is electrically connected to the first pad. 
     In the one aspect, one connector of the plurality of connectors may include the third pad mounting the light source, and the electrically conductive line electrically connecting the first pad and the third pad. Another connector of the plurality of connectors may include a fourth pad electrically connected to the first pad, and a wire electrically connecting the light source and the fourth pad. 
     The light source is mounted on the third pad of one connector, and the first pad and the third pad are electrically connected through the electrically conductive line of one connector. The light source is mounted on the third pad and is electrically connected to the first pad. The light source and the fourth pad are electrically connected through the wire of another connector. The fourth pad is electrically connected to the first pad. The light source is electrically connected to the first pad through the wire. 
     In the one aspect, each of the connectors may include the fourth pad electrically connected to the first pad, and a wire electrically connecting the light source and the fourth pad. 
     The light source and the fourth pad are electrically connected through the wire of each connector. The fourth pad is electrically connected to the first pad. The light source is electrically connected to the first pad through the wire. 
     In the one aspect, the window base may be a silicon substrate. 
     The silicon substrate has high thermal conductivity. The window base increases thermal conduction to the electric conductor. This increase of thermal conduction enables a decrease in the area of the electrically conductive body. In a case where the area of the electrically conductive body is decreased, the electrically conductive body decreases an amount of the light from the reflection portion blocked through the electrically conductive body itself. 
     In the one aspect, the window may include an antireflection film disposed on at least one surface of the lower surface and the light exit surface. 
     The antireflection film effectively reduces light reflection on the window base. 
     A method for making a light-emitting device according to another aspect includes: preparing a plurality of windows mounting the light source; preparing a block including a plurality of the packages coupled each other in an array; mounting the window on each of the packages of the block to electrically connect a second pad and a third pad corresponding to each other; and separating the block to obtain the plurality of packages mounting the corresponding window. 
     According to the other aspect, the wall portion of the package is disposed along the window base. Thus, when the window is mounted in each package of the block, the window is mounted with the wall portion of the package as a mark. Since the mark exists, the window is easily mounted on each package of the block such that the second pad and the third pad corresponding to each other are electrically connected. 
     In the other aspect, a height from the placement surface to the upper wall surface may be larger than a height from the placement surface to the light exit surface in a state where the window is mounted to correspond to each package of the block. When the block is separated, the block may be diced along cutting planned lines set between the packages adjacent to each other after the upper wall surface is attached to a dicing tape. 
     In a case where the height from the placement surface to the upper wall surface may be larger than the height from the placement surface to the light exit surface, only the upper wall surface is attached to the dicing tape when the block is separated due to dicing. The lower surface of the window base does not come into contact with the dicing tape, and the window base is prevented from being deteriorated due to adhesion of the adhesive. 
     Advantageous Effects of Invention 
     The one aspect provides the light-emitting device that effectively dissipates the heat generated in the light source. The other aspect provides the method for making the light-emitting device that effectively dissipates the heat generated in the light source. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1( a )  is a view schematically illustrating a configuration of a light-emitting device according to a first embodiment, and  FIG. 1( b )  is an enlarged view of a light source in  FIG. 1( a ) . 
         FIG. 2( a )  is a plan view of the light-emitting device according to the first embodiment, and  FIG. 2( b )  is a cross-sectional view taken along a line IIb-IIb in  FIG. 2( a ) . 
         FIG. 3  is an enlarged view of a region E 1  in  FIG. 2( b ) . 
         FIG. 4( a )  is a plan view of the light-emitting device according to the first embodiment, and  FIG. 4( b )  is a side view of the light-emitting device according to the first embodiment.  FIG. 4( c )  is a front view of the light-emitting device according to the first embodiment, and  FIG. 4( d )  is a bottom view of the light-emitting device according to the first embodiment. 
         FIG. 5( a )  is a plan view of a package according to the first embodiment, and  FIG. 5( b )  is a cross-sectional view taken along a line Vb-Vb in  FIG. 5( a ) . 
         FIG. 6( a )  is a plan view of a window according to the first embodiment, and  FIG. 6( b )  is a front view of the window according to the first embodiment. 
         FIG. 7  is a flowchart illustrating a method for making the light-emitting device according to the first embodiment. 
         FIG. 8  is a view schematically illustrating a main process in the method for making the light-emitting device according to the first embodiment. 
         FIG. 9  is a view schematically illustrating the main process in the method for making the light-emitting device according to the first embodiment. 
         FIG. 10  is a view schematically illustrating the main process in the method for making the light-emitting device according to the first embodiment. 
         FIG. 11  is a view schematically illustrating the main process in the method for making the light-emitting device according to the first embodiment. 
         FIG. 12( a )  is a plan view of a window according to a second embodiment, and  FIG. 12( b )  is a front view of the window according to the second embodiment.  FIG. 12( c )  is a plan view of the window on which a light source according to the second embodiment is mounted, and  FIG. 12( d )  is a front view of the window on which the light source according to the second embodiment is mounted. 
         FIG. 13( a )  is a plan view of a window according to a third embodiment, and  FIG. 13( b )  is a front view of the window according to the third embodiment.  FIG. 13( c )  is a plan view of the window on which a light source according to the third embodiment is mounted, and  FIG. 13( d )  is a front view of the window on which the light source according to the third embodiment is mounted. 
         FIG. 14( a )  is a plan view of a light-emitting device according to a fourth embodiment, and  FIG. 14( b )  is a side view of the light-emitting device according to the fourth embodiment.  FIG. 14( c )  is a front view of the light-emitting device according to the fourth embodiment, and  FIG. 14( d )  is a bottom view of the light-emitting device according to the fourth embodiment. 
         FIG. 15( a )  is a plan view of a light-emitting device according to a fifth embodiment, and  FIG. 15( b )  is a side view of the light-emitting device according to the fifth embodiment.  FIG. 15( c )  is a front view of the light-emitting device according to the fifth embodiment, and  FIG. 15( d )  is a bottom view of the light-emitting device according to the fifth embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the description, the same reference signs will be used for the same elements or elements having the same function, and redundant description will be omitted. 
     First Embodiment 
     A configuration of a light-emitting device D 1  according to a first embodiment will be described with reference to  FIGS. 1 to 6 .  FIG. 1( a )  is a view schematically illustrating a configuration of a light-emitting device according to a first embodiment, and  FIG. 1( b )  is an enlarged view of a light source in  FIG. 1( a ) .  FIG. 2( a )  is a plan view of the light-emitting device according to the first embodiment, and  FIG. 2( b )  is a cross-sectional view taken along line a IIb-IIb in  FIG. 2( a ) .  FIG. 3  is an enlarged view of a region E 1  in  FIG. 2( b ) .  FIG. 4( a )  is a plan view of the light-emitting device according to the first embodiment, and  FIG. 4( b )  is a side view of the light-emitting device according to the first embodiment.  FIG. 4( c )  is a front view of the light-emitting device according to the first embodiment, and  FIG. 4( d )  is a bottom view of the light-emitting device according to the first embodiment.  FIG. 5( a )  is a plan view of a package according to the first embodiment, and  FIG. 5( b )  is a cross-sectional view taken along line a Vb-Vb in  FIG. 5( a ) .  FIG. 6( a )  is a plan view of a window according to the first embodiment, and  FIG. 6( b )  is a front view of the window according to the first embodiment. 
     The light-emitting device D 1  includes a light source  10 , a window  20 , and a package  30 . The window  20  is mounted with the light source  10 . The package  30  defines a space SC 1  with the window  20 . The light source  10  is disposed in the space SC 1 . 
     The light source  10  includes a light-emitting element. In the present embodiment, the light-emitting element includes a light-emitting diode (LED). The light-emitting diode used in the light-emitting element emits light in an infrared region having wavelengths of 3 to 5 μm, for example. The light source  10  has, for example, a surface mounting type rectangular parallelepiped shape or a substantially cubic shape. In the light source  10 , for example, one of six surfaces having a rectangular parallelepiped shape is a terminal surface  12 , and an anode terminal  14  and a cathode terminal  16  are disposed on the terminal surface  12 , for example. The light source  10  includes a radiation surface  18  on the opposite side of the terminal surface  12 , and light is emitted from the radiation surface  18 . 
     The window  20  includes a window base  21  and an electrically conductive body WD 1 . The window base  21  includes a light exit surface  22 , a lower surface  23 , and a side surface  24 . The lower surface  23  opposes the light exit surface  22 . The side surface  24  couples the light exit surface  22  and the lower surface  23 . The electrically conductive body WD 1  is disposed on the lower surface  23  of the window base  21 . The coupling between the light exit surface  22  and the lower surface  23  includes a configuration in which the light exit surface  22  and the lower surface  23  are directly coupled and a configuration in which the light exit surface  22  and the lower surface  23  are indirectly coupled with another surface interposed therebetween. Hereinafter, in this specification, coupling between surfaces includes direct coupling and indirect coupling. 
     The package  30  includes a base portion  40  and a wall portion  50 , and the wall portion  50  is positioned on the base portion  40 , for example. The base portion  40  includes a recess  42 , a placement surface  44 , a bottom surface  46 , and an outer side surface  48 . The recess  42  is formed to open toward the lower surface  23  of the window base  21 . The placement surface  44  is disposed along an edge  47  of the recess  42  and opposes the lower surface  23  of the window base  21 . The bottom surface  46  opposes the placement surface  44 . The outer side surface  48  is coupled to the bottom surface  46 . 
     The wall portion  50  includes an inner wall surface  52 , an outer wall surface  54 , and an upper wall surface  56 , and is disposed along the window base  21  when viewed from a direction Ax 1  orthogonal to the light exit surface  22 . The inner wall surface  52  is coupled to the placement surface  44  and opposes the side surface  24  of the window  20 . The outer wall surface  54  opposes the inner wall surface  52  and is coupled to the outer side surface  48 . The upper wall surface  56  couples the inner wall surface  52  and the outer wall surface  54 . 
     The package  30  may have a polygonal shape when viewed from the direction Ax 1  orthogonal to the light exit surface  22 . The package  30  has, for example, a quadrangular shape including a square shape and a rectangular shape, a hexagonal shape, or an octagonal shape. The number of each of the outer side surfaces  48  and the outer wall surfaces  54  may be plural. The number of each of the outer side surfaces  48  and the outer wall surfaces  54  is, for example, four, six, or eight. 
     The package  30  includes a reflection portion  32  and an electric conductor  34 . The reflection portion  32  is disposed on a surface  43  of the recess  42 . In the light-emitting device D 1 , light is emitted from the radiation surface  18  of the light source  10  to the reflection portion  32 , and the reflection portion  32  reflects the light emitted from the light source  10  to the window  20 . The light reflected on the reflection portion  32  is transmitted through the window base  21  of the window  20  and emitted to the outside of the light-emitting device D 1 . The electric conductor  34  is disposed on the placement surface  44 , the inner wall surface  52 , the upper wall surface  56 , the outer wall surface  54 , and the outer side surface  48 . 
     The window base  21  is made of a material suitable for transmitting the light reflected on the reflection portion  32 . This material includes, for example, silicon (Si), sapphire, and germanium. Among the materials of the window base  21 , the silicon substrate has a high thermal conductivity of about 150 W/(mK), and favorably transmits infrared light having a wavelength region of, for example, 3 to 5 μm. The silicon substrate may include, on the substrate, an antireflection film that effectively reduces reflection of infrared light having wavelengths of 3 to 5 μm. The silicon substrate disposed with the antireflection film has high light transmittance at wavelengths of 3 to 5 μm, for example, in addition to high thermal conductivity. 
     The electrically conductive body WD 1  on the window base  21  includes a plurality of first pads  25  and connectors CN 1 . The plurality of first pads  25  oppose the placement surface  44 . The connectors CN 1  electrically connect the light source  10  and the plurality of first pads  25 . In the present embodiment, each connector CN 1  includes, for example, a third pad  26  and an electrically conductive line  27 . The light source  10  is mounted through the third pad  26 . The electrically conductive line  27  connects the first pad  25  and the third pad  26 . The third pad  26  is disposed on a region where the light source  10  is mounted on the window base  21 , for example, a central region of the window base  21 . The plurality of first pads  25  are disposed, for example, in a peripheral region surrounding the central region. 
     The third pad  26  may include one or a plurality of pads. The third pad  26  includes, for example, a first mounting pad body  61  and a second mounting pad body  62 . One of the plurality of third pads  26  is connected to the anode terminal  14  or the cathode terminal  16  of the light source  10 . For example, the first mounting pad body  61  and the second mounting pad body  62  are connected to the anode terminal  14  and the cathode terminal  16  of the light source  10 , respectively. 
     The material of the third pad  26  includes, for example, metal plating containing Cu—Ni—Au and a solder. The solder may be disposed on Cu—Ni—Au. A Au layer is positioned as the uppermost layer of the metal-plated Cu—Ni—Au. The material of the first pad  25  and the electrically conductive line  27  is metal plating containing Cu—Ni—Au, Al—Ni—Au, and Ti—Pt—Au. The Au layer is positioned on the uppermost layer of the metal plating. 
     The window  20  includes a dummy pad  28  disposed on the lower surface  23 . The light source  10  is mounted on the dummy pad  28 . The dummy pad  28  may include one or a plurality of pads. The dummy pad  28  may include, for example, a first dummy pad body  71  and a second dummy pad body  72 . The first dummy pad body  71  and the second dummy pad body  72  support the light source  10  together with the first mounting pad body  61  and the second mounting pad body  62 . In the present embodiment, the first dummy pad body  71  and the second dummy pad body  72  support the light source  10 , but are not electrically connected to the light source  10 . The dummy pad  28  may be made of the same material as the third pad  26 . 
     For example, the first mounting pad body  61 , the second mounting pad body  62 , the first dummy pad body  71 , and the second dummy pad body  72  may be positioned in this order at respective vertexes of a quadrangle virtually drawn in a region of the lower surface  23  where the light source  10  is mounted. 
     In the present embodiment, the plurality of third pads  26  include two pad bodies, that is, the first mounting pad body  61  and the second mounting pad body  62 , and the plurality of dummy pads  28  include two dummy pad bodies, that is, the first dummy pad body  71  and the second dummy pad body  72 . In the light-emitting device, the number of pad bodies included in the third pad  26  and the dummy pad  28  is not particularly limited, in a case where power is supplied to the light source  10  and the light source  10  is stably supported. For example, the number of pad bodies included in the third pad  26  may be two, and the number of pad bodies included in the dummy pad  28  may be one. The number of pad bodies included in the third pad  26  may be two, and the number of pad bodies included in the dummy pad  28  may be three. 
     The window base  21  has, for example, a shape like a flat plate, and may have a substantially square shape in plan view. The window base  21  includes, for example, a first side portion  21   a , a second side portion  21   b , a third side portion  21   c , and a fourth side portion  21   d . The first side portion  21   a  is positioned on the opposite side of the third side portion  21   c . The second side portion  21   b  is positioned on the opposite side of the fourth side portion  21   d.    
     The window base  21  includes, for example, four corner portions. The window base  21  includes a first corner portion  29   a  defined by the fourth side portion  21   d  and the first side portion  21   a , and includes a second corner portion  29   b  defined by the first side portion  21   a  and the second side portion  21   b . The window base  21  includes a third corner portion  29   c  defined by the second side portion  21   b  and the third side portion  21   c , and includes a fourth corner portion  29   d  defined by the third side portion  21   c  and the fourth side portion  21   d.    
     The first pad  25  includes, for example, a first pad body  63  and a second pad body  64 . The first pad  25  is disposed in, for example, a peripheral region. For example, the first pad body  63  is disposed from the first corner portion  29   a  to the second corner portion  29   b  on the first side portion  21   a . For example, the second pad body  64  is disposed from the third corner portion  29   c  to the fourth corner portion  29   d  on the third side portion  21   c.    
     The first pad body  63  includes, for example, a first connection portion  63   a  and a second connection portion  63   b . The first connection portion  63   a  is positioned at one end edge of the first pad body  63 . The second connection portion  63   b  is positioned at another end edge of the first pad body  63 . The first connection portion  63   a  is disposed, for example, at the first corner portion  29   a . The second connection portion  63   b  is disposed, for example, at the second corner portion  29   b . The first connection portion  63   a  and the second connection portion  63   b  connect the first pad body  63  and the electric conductor disposed in the package  30 . 
     The second pad body  64  includes, for example, a third connection portion  64   a  and a fourth connection portion  64   b . The third connection portion  64   a  is positioned at one end edge of the second pad body  64 . The fourth connection portion  64   b  is positioned at another end edge of the second pad body  64 . The third connection portion  64   a  is disposed, for example, at the third corner portion  29   c . The fourth connection portion  64   b  is disposed, for example, at the fourth corner portion  29   d . The third connection portion  64   a  and the fourth connection portion  64   b  connect the second pad body  64  and the electric conductor disposed in the package  30 . 
     In the present embodiment, the window  20  includes an underfill UF. The underfill UF is disposed to fill a gap generated between the lower surface  23 , the third pad  26 , the dummy pad  28 , and the light source  10 . 
     The electrically conductive line  27  may be one or more. The electrically conductive line  27  electrically connects the first pad  25  and the third pad  26  corresponding to each other. The plurality of electrically conductive lines  27  include, for example, a first electrically conductive line  81  and a second electrically conductive line  82 . The first electrically conductive line  81  electrically connects the first mounting pad body  61  and the first pad body  63 , for example. The second electrically conductive line  82  electrically connects the second mounting pad body  62  and the second pad body  64 , for example. 
     The first electrically conductive line  81  is connected to the first pad body  63  and the first mounting pad body  61 . For example, one end edge of the first electrically conductive line  81  is connected to the first pad body  63  to cross the first pad body  63 . For example, another end edge of the first electrically conductive line  81  is connected to the first mounting pad body  61 . The one end edge of the first electrically conductive line  81  and the first pad body  63  intersect, for example, near the center of the first pad body  63 . The other end edge of the first electrically conductive line  81  is positioned, for example, between the window base  21  and the first mounting pad body  61  in the direction Ax 1 . 
     The second electrically conductive line  82  is connected to the second pad body  64  and the second mounting pad body  62 . For example, one end edge of the second electrically conductive line  82  is connected to the second pad body  64  to cross the second pad body  64 . For example, another end edge of the second electrically conductive line  82  is connected to the second mounting pad body  62 . The one end edge of the second electrically conductive line  82  and the second pad body  64  intersect, for example, near the center of the second pad body  64 . The other end edge of the second electrically conductive line  82  is positioned, for example, between the window base  21  and the second mounting pad body  62  in the direction Ax 1 . 
     The outer side surface  48  of the package  30  includes, for example, a first outer side surface  48   a , a second outer side surface  48   b , a third outer side surface  48   c , and a fourth outer side surface  48   d . The first outer side surface  48   a  opposes the third outer side surface  48   c . The second outer side surface  48   b  opposes the fourth outer side surface  48   d . The first outer side surface  48   a  connects the fourth outer side surface  48   d  and the second outer side surface  48   b . The second outer side surface  48   b  connects the first outer side surface  48   a  and the third outer side surface  48   c . The third outer side surface  48   c  connects the second outer side surface  48   b  and the fourth outer side surface  48   d , and the fourth outer side surface  48   d  connects the third outer side surface  48   c  and the first outer side surface  48   a . The first outer side surface  48   a , the second outer side surface  48   b , the third outer side surface  48   c , and the fourth outer side surface  48   d  are coupled to the bottom surface  46 . 
     The outer wall surface  54  includes, for example, a first outer wall surface  54   a , a second outer wall surface  54   b , a third outer wall surface  54   c , and a fourth outer wall surface  54   d . The first outer wall surface  54   a  opposes the third outer wall surface  54   c . The second outer wall surface  54   b  opposes the fourth outer wall surface  54   d . The first outer wall surface  54   a  connects the fourth outer wall surface  54   d  and the second outer wall surface  54   b . The second outer wall surface  54   b  connects the first outer wall surface  54   a  and the third outer wall surface  54   c . The third outer wall surface  54   c  connects the second outer wall surface  54   b  and the fourth outer wall surface  54   d . The fourth outer wall surface  54   d  connects the third outer wall surface  54   c  and the first outer wall surface  54   a.    
     The first outer side surface  48   a  is coupled to the first outer wall surface  54   a . The second outer side surface  48   b  is coupled to the second outer wall surface  54   b . The third outer side surface  48   c  is coupled to the third outer wall surface  54   c . The fourth outer side surface  48   d  is coupled to the fourth outer wall surface  54   d.    
     The inner wall surface  52  includes, for example, a first inner wall surface  52   a , a second inner wall surface  52   b , a third inner wall surface  52   c , and a fourth inner wall surface  52   d . The first inner wall surface  52   a  opposes the third inner wall surface  52   c . The second inner wall surface  52   b  opposes the fourth inner wall surface  52   d . The first inner wall surface  52   a  connects the fourth inner wall surface  52   d  and the second inner wall surface  52   b . The second inner wall surface  52   b  connects the first inner wall surface  52   a  and the third inner wall surface  52   c . The third inner wall surface  52   c  connects the second inner wall surface  52   b  and the fourth inner wall surface  52   d . The fourth inner wall surface  52   d  connects the third inner wall surface  52   c  and the first inner wall surface  52   a . The first inner wall surface  52   a , the second inner wall surface  52   b , the third inner wall surface  52   c , and the fourth inner wall surface  52   d  are coupled to the mounting surface  44 . The first inner wall surface  52   a  opposes the first outer wall surface  54   a . The second inner wall surface  52   b  opposes the second outer wall surface  54   b . The third inner wall surface  52   c  opposes the third outer wall surface  54   c . The fourth inner wall surface  52   d  opposes the fourth outer wall surface  54   d.    
     The upper wall surface  56  includes, for example, a first upper wall surface  56   a , a second upper wall surface  56   b , a third upper wall surface  56   c , and a fourth upper wall surface  56   d . The first upper wall surface  56   a  is positioned on the opposite side of the third upper wall surface  56   c . The second upper wall surface  56   b  is positioned on the opposite side of the fourth upper wall surface  56   d . The first upper wall surface  56   a  connects the first inner wall surface  52   a  and the first outer wall surface  54   a . The second upper wall surface  56   b  connects the second inner wall surface  52   b  and the second outer wall surface  54   b . The third upper wall surface  56   c  connects the third inner wall surface  52   c  and the third outer wall surface  54   c . The fourth upper wall surface  56   d  connects the fourth inner wall surface  52   d  and the fourth outer wall surface  54   d.    
     The electric conductor  34  includes a plurality of second pads  36 . The plurality of second pads  36  are disposed on the placement surface  44  to oppose the corresponding first pads  25  of the plurality of first pads  25 . The plurality of second pads  36  are electrically connected to the corresponding first pads  25 . 
     The placement surface  44  includes, for example, four corners. For example, the placement surface  44  includes a first corner  44   a . The first corner  44   a  is defined by the placement surface  44 , the fourth inner wall surface  52   d , and the first inner wall surface  52   a . The placement surface  44  includes a second corner  44   b . The second corner  44   b  is defined by the placement surface  44 , the first inner wall surface  52   a , and the second inner wall surface  52   b . The placement surface  44  includes a third corner  44   c . The third corner  44   c  is defined by the placement surface  44 , the second inner wall surface  52   b , and the third inner wall surface  52   c . The placement surface  44  includes a fourth corner  44   d . The fourth corner  44   d  is defined by the placement surface  44 , the third inner wall surface  52   c , and the fourth inner wall surface  52   d.    
     In the present embodiment, for example, the second pads  36  of the electric conductor  34  are disposed at the four corners. The second pad  36  is electrically connected to a connection portion of each pad body disposed on the window  20 . For example, the second pads  36  include a first electric conductor  37   a , a second electric conductor  37   b , a third electric conductor  37   c , and a fourth electric conductor  37   d  at the corners. The first electric conductor  37   a  is disposed on the first corner  44   a . The first electric conductor  37   a  is electrically connected to the fourth connection portion  64   b  of the second pad body  64 . The second electric conductor  37   b  is disposed on the second corner  44   b . The second electric conductor  37   b  is electrically connected to the third connection portion  64   a  of the second pad body  64 . The third electric conductor  37   c  is disposed on the third corner  44   c . The third electric conductor  37   c  is electrically connected to the second connection portion  63   b  of the first pad body  63 . The fourth electric conductor  37   d  is disposed on the fourth corner  44   d . The fourth electric conductor  37   d  is electrically connected to the first connection portion  63   a  of the first pad body  63 . 
     The fourth connection portion  64   b  of the second pad body  64  of the window  20  is electrically connected to the first electric conductor  37   a  of the placement surface  44  through an electrically conductive resin. The third connection portion  64   a  of the second pad body  64 , and the second connection portion  63   b  and the first connection portion  63   a  of the first pad body  63  in the window  20  are electrically connected to the second electric conductor  37   b , the third conductor  37   c , and the fourth electric conductor  37   d  of the placement surface  44 , respectively, through an electrically conductive resin. 
     The electric conductor  34  includes, for example, a first inner electric conductor  38   a , a second inner electric conductor  38   b , a third inner electric conductor  38   c , and a fourth inner electric conductor  38   d  on the inner wall surface  52 . For example, the package  30  includes, on the inner wall surface  52 , a first edge portion defined by the fourth inner wall surface  52   d  and the first inner wall surface  52   a , and a second edge portion defined by the first inner wall surface  52   a  and the second inner wall surface  52   b . The first inner electric conductor  38   a  is disposed on the first edge portion. The first inner electric conductor  38   a  is electrically connected to the first electric conductor  37   a . The second inner electric conductor  38   b  is disposed on the second edge portion. The second inner electric conductor  38   b  is electrically connected to the second electric conductor  37   b.    
     The package  30  includes a third edge portion defined by the second inner wall surface  52   b  and the third inner wall surface  52   c , and a fourth edge portion defined by the third inner wall surface  52   c  and the fourth inner wall surface  52   d  on the inner wall surface  52 . The third inner electric conductor  38   c  electrically connected to the third electric conductor  37   c  is disposed on the third edge portion. The fourth inner electric conductor  38   d  electrically connected to the fourth electric conductor  37   d  is disposed on the fourth edge portion. 
     The package  30  includes a corner portion  31  defined by the upper wall surface  56  and the outer wall surfaces  54  adjacent to each other. For example, in a case where the package  30  has a quadrangular shape when viewed from the direction Ax 1  orthogonal to the light exit surface  22 , the package  30  includes four corner portions  31 . On the upper wall surface  56 , the package  30  includes a first corner portion  31   a  defined by the upper wall surface  56 , the fourth outer wall surface  54   d , and the first outer wall surface  54   a . On the upper wall surface  56 , the package  30  includes a second corner portion  31   b  defined by the upper wall surface  56 , the first outer wall surface  54   a , and the second outer wall surface  54   b . On the upper wall surface  56 , the package  30  includes a third corner portion  31   c  defined by the upper wall surface  56 , the second outer wall surface  54   b , and the third outer wall surface  54   c . On the upper wall surface  56 , the package  30  includes a fourth corner portion  31   d  defined by the upper wall surface  56 , the third outer wall surface  54   c , and the fourth outer wall surface  54   d.    
     The electric conductor  34  includes, for example, a first upper electric conductor  39   a  and a third upper electric conductor  39   c  on the upper wall surface  56 . The first upper electric conductor  39   a  is disposed on the first upper wall surface  56   a , the second upper wall surface  56   b , and the fourth upper wall surface  56   d  except for the first corner portion  31   a  and the second corner portion  31   b . The third upper electric conductor  39   c  is disposed on the second upper wall surface  56   b , the third upper wall surface  56   c , and the fourth upper wall surface  56   d  except for the third corner portion  31   c  and the fourth corner portion  31   d . The electric conductor  34  is not disposed on the corner portion  31 . 
     The first upper electric conductor  39   a  may be disposed in a region of 50% or more of an area of the first upper wall surface  56   a  on the first upper wall surface  56   a . The third upper electric conductor  39   c  may be disposed in a region of 50% or more of an area of the third upper wall surface  56   c  on the third upper wall surface  56   c . The electric conductor  34  may be disposed on the upper wall surface  56  such that the ratio of an area of the electric conductor  34  to an area of the upper wall surface  56  is 50% or more. 
     In the present embodiment, the first upper electric conductor  39   a  is not disposed in an inner region  56   s  of the first upper wall surface  56   a . The first upper electric conductor  39   a  may be disposed in the inner region  56   s . In the present embodiment, the third upper electric conductor  39   c  is not disposed in an inner region  56   t  of the third upper wall surface  56   c . The second upper electric conductor  39   b  may be disposed in the inner region  56   t.    
     The package  30  includes a ridge portion  33  defined by the outer wall surfaces  54  adjacent to each other. For example, in a case where the package  30  includes a quadrangular shape when viewed from the direction Ax 1  orthogonal to the light exit surface  22 , the package  30  includes four ridge portions  33 . On the outer wall surface  54 , the package  30  includes a first ridge portion  33   a  defined by the fourth outer wall surface  54   d  and the first outer wall surface  54   a . On the outer wall surface  54 , the package  30  includes a second ridge portion  33   b  defined by the first outer wall surface  54   a  and the second outer wall surface  54   b . On the outer wall surface  54 , the package  30  includes a third ridge portion  33   c  defined by the second outer wall surface  54   b  and the third outer wall surface  54   c . On the outer wall surface  54 , the package  30  includes a fourth ridge portion  33   d  defined by the third outer wall surface  54   c  and the fourth outer wall surface  54   d . These ridge portions  33  are disposed, for example, from the boundary between the upper wall surface  56  and the outer wall surface  54  to the boundary between the outer side surface  48  and the bottom surface  46 . 
     The package  30  includes a first outer electric conductor  35   a  disposed on the first outer wall surface  54   a  and the first outer side surface  48   a . The package  30  includes a third outer electric conductor  35   c  on the third outer wall surface  54   c  and the third outer side surface  48   c . The first outer electric conductor  35   a  is electrically connected to the first upper electric conductor  39   a . The third outer electric conductor  35   c  is electrically connected to the third upper electric conductor  39   c . The first outer electric conductor  35   a  is not disposed on the first ridge portion  33   a  and the second ridge portion  33   b . The third outer electric conductor  35   c  is not disposed on the third ridge portion  33   c  and the fourth ridge portion  33   d . The electric conductor  34  is not disposed on the ridge portion  33 . 
     The first outer electric conductor  35   a  may be disposed in a region of 50% or more of an area of the first outer wall surface  54   a  on the first outer wall surface  54   a . The third outer electric conductor  35   c  may be disposed in a region of 50% or more of an area of the third outer wall surface  54   c  on the third outer wall surface  54   c . The electric conductor  34  may be disposed on the outer wall surface  54  such that the ratio of the area of the electric conductor  34  to an area of the outer wall surface  54  is 50% or more. 
     The first outer electric conductor  35   a  may be disposed in a region of 50% or more of a sum of the area of the first outer wall surface  54   a  and an area of the first outer side surface  48   a  on the first outer wall surface  54   a  and the first outer side surface  48   a . The third outer electric conductor  35   c  may be disposed in a region of 50% or more of a total area of an area of the third outer wall surface  54   c  and an area of the third outer side surface  48   c  on the third outer wall surface  54   c  and the third outer side surface  48   c . The electric conductor  34  may be disposed on the outer wall surface  54  and the outer side surface  48  such that the ratio of the area of the electric conductor  34  to the sum of the area of the outer wall surface  54  and an area of the outer side surface  48  is 50% or more. 
     The package  30  includes, for example, a first bottom electric conductor  41   a  and a third bottom electric conductor  41   c  on the bottom surface  46 . The electric conductor may be further disposed over the bottom surface  46 . The first bottom electric conductor  41   a  may be one of an anode electrode and a cathode electrode. The third bottom electric conductor  41   c  may be the other of the anode electrode and the cathode electrode. The first bottom electric conductor  41   a  is electrically connected to the first outer electric conductor  35   a . The third bottom electric conductor  41   c  is electrically connected to the third outer electric conductor  35   c.    
     The first bottom electric conductor  41   a  may have a two-dimensional shape such as a rectangular shape. The third bottom electric conductor  41   c  may have a two-dimensional shape in which a rectangular shape and a triangular shape are integrated. Due to the difference in these two-dimensional shapes, the anode electrode and the cathode electrode are easily identified visually. 
     The package  30  includes a reflection portion electric conductor  45 . The reflection portion electric conductor  45  is disposed on the recess  42 , the placement surface  44 , the inner wall surface  52 , and the upper wall surface  56 . The reflection portion electric conductor  45  includes, for example, a first reflection portion electric conductor  45   a  and a second reflection portion electric conductor  45   b . The second reflection portion electric conductor  45   b  is disposed to oppose the first reflection portion electric conductor  45   a.    
     The first reflection portion electric conductor  45   a  is disposed on the recess  42 , the placement surface  44 , the second inner wall surface  52   b , and the second upper wall surface  56   b . The second reflection portion electric conductor  45   b  is disposed on the recess  42 , the placement surface  44 , the fourth inner wall surface  52   d , and the fourth upper wall surface  56   d . Both the first reflection portion electric conductor  45   a  and the second reflection portion electric conductor  45   b  are disposed on the recess  42  and are electrically connected to the upper end of the reflection portion  32  disposed on the recess  42 . The first reflection portion electric conductor  45   a  and the second reflection portion electric conductor  45   b  are made of, for example, electrically conductive materials obtained at the time of forming the reflection portion  32  including metal plating. The reflection portion  32  includes metal plating containing Cu—Ni—Au. In the present embodiment, the Au layer is positioned on the uppermost layer of the metal plating. 
     The edge  47  of the recess  42  defines a boundary with the placement surface  44 . The edge  47  has, for example, a substantially circular shape when viewed from the direction Ax 1  orthogonal to the light exit surface  22 . The shape of the edge  47  may be a substantially circular shape or may be any shape as long as the light from the light source  10  is reflected on the reflection portion  32  to the window  20 . The shape of the edge  47  may be, for example, an elliptical shape or a quadrangular shape including a square shape and a rectangular shape when viewed from the direction Ax 1 . The shape of the edge  47  viewed from the direction Ax 1  may be a polygon including a pentagon. 
     The recess  42  includes an edge portion  49  along the edge  47  on the surface  43 . The edge portion  49  includes the edge  47 . The reflection portion  32  is not disposed on the edge portion  49  but is disposed on the surface  43  of the recess  42  excluding the edge portion  49 . The first reflection portion electric conductor  45   a  and the second reflection portion electric conductor  45   b  are also disposed on the edge portion  49 , and are disposed from the upper end edge of the reflection portion  32  to the upper wall surface  56 . 
     The reflection portion  32  has a cross-sectional shape corresponding to the surface  43  of the recess  42 . The reflecting portion  32  may have any cross-sectional shape as long as it reflects light from the light source portion  10  to the window portion  20 . The reflection portion  32  has, for example, an elliptical shape or a parabolic shape. According to these shapes, the beam of the light reflected on the reflection portion  32  is, for example, a focused beam. If necessary, the beam of the light reflected on the reflection portion  32  may be a parallel beam or a diffused beam. In addition to the elliptical shape or the parabolic shape, the cross-sectional shape of the reflection portion  32  may have another shape in which the light from the light source  10  is reflected to the window  20 , for example. The other shape may be formed by combining a plurality of planar shapes. 
     In the present embodiment, the package  30  is made of, for example, a ceramic or a PPA resin. The electric conductor  34  is made of, metal plating. The metal plating is, for example, Cu—Ni—Au plating. In the present embodiment, the Au layer is positioned on the uppermost layer of the metal plating. 
     In the light-emitting device D 1 , a height from the placement surface  44  to the upper wall surface  56  may be larger than a height from the placement surface  44  to the light exit surface  22 . The height from the placement surface  44  to the upper wall surface  56  may be about the same as the height from the placement surface  44  to the light exit surface  22 . The height from the placement surface  44  to the upper wall surface  56  may be smaller than the height from the placement surface  44  to the light exit surface  22 . 
     In the light-emitting device D 1 , the light source  10  mounted on the window  20  emits light to the reflection portion  32  disposed in the recess  42  opposing the lower surface  23  of the window base  21 . The reflection portion  32  reflects the light to the window  20 . The window  20  transmits the light reflected on the reflection portion  32  toward the outside. The reflection portion  32  is disposed on the surface  43  of the recess  42 , and the light to be reflected is focused due to the recessed shape of the reflection portion  32 . As a result, the light transmitted through the window  20  has an improved light density, and the improved light density provides the light-emitting device D 1  for analyzing the environmental gas with high sensitivity. 
     In the light-emitting device D 1 , the light source  10  is electrically connected to the plurality of first pads  25  through a plurality of connectors CN 1 . The plurality of first pads  25  are electrically connected to the electric conductor  34  through the corresponding second pads  36 . The light source  10  is electrically connected to the electric conductor  34  through the first pad  25  and the second pad  36 . The electric conductor  34  is disposed on the placement surface  44 , the inner wall surface  52 , the upper wall surface  56 , the outer wall surface  54 , and the outer side surface  48 . This disposal of the electric conductor  34  provides a large area in contact with the outside of the light-emitting device D 1 . The heat generated in the light source  10  due to the supply of power is effectively dissipated through the electric conductor  34  having the large area in contact with the outside. 
     In the present embodiment, for example, the light source  10  is supported with the four pads, that is, the first mounting pad body  61 , the second mounting pad body  62 , the first dummy pad body  71 , and the second dummy pad body  72 . The light source  10  is stably mounted on the pad. The heat generated from the light source  10  is efficiently conducted to the electrically conductive body WD 1  particularly through the first mounting pad body  61  and the second mounting pad body  62 . 
     In the light-emitting device D 1 , the electric conductor  34  is further disposed on the bottom surface  46 . Therefore, this disposal further increases the area where the electric conductor  34  is in contact with the outside of the light-emitting device D 1 . As a result, the light-emitting device D 1  further improves heat dissipation through the electric conductor  34 . 
     In the present embodiment, the thickness of the electric conductor  34  is, for example, 100 Å to 100 μm. In a case where the electric conductor  34  has a thickness in this range, the heat dissipation through the electric conductor  34  is further increased. The thickness of the electric conductor  34  may be, for example, 1 μm to 30 μm. In a case where the electric conductor  34  has a thickness in this range, the heat dissipation through the electric conductor  34  is further increased. 
     In the present embodiment, the thermal conductivity of the electric conductor  34  is, for example, 50 to 500 W/(mK). In a case where the electric conductor  34  has a thermal conductivity in this range, the heat dissipation through the electric conductor  34  is further increased. The thermal conductivity of the electric conductor  34  may be, for example, 300 to 450 W/(mK). In a case where the electric conductor  34  has a thermal conductivity in this range, the heat dissipation through the electric conductor  34  is further increased. 
     In the light-emitting device D 1 , the height from the placement surface  44  to the upper wall surface  56  is larger than the height from the placement surface  44  to the light exit surface  22 . Therefore, in the configuration in which the height from the placement surface  44  to the upper wall surface  56  is larger than the height from the placement surface  44  to the light exit surface  22 , the wall portion disposed along the window base  21  prevents the window base  21  from coining into contact with an external object of the light-emitting device D 1 . Damage to the window base  21  is reduced, and thus the window base  21  favorably transmits the light reflected on the reflection portion  32  toward the outside. On the inner wall surface  52 , the electric conductor  34  is disposed in a region from the placement surface  44  to the upper wall surface  56 . Therefore, this disposal further improves the heat dissipation through the electric conductor  34 . For example, in a light-emitting device including an LED, generally, the size of the electric conductor tends to be reduced from the viewpoint of reducing the generation of noise. But, in the light-emitting device D 1  of the present embodiment, the electric conductor  34  is disposed in the region from the placement surface  44  to the upper wall surface  56  to improve the heat dissipation through the electric conductor  34 . 
     In the light-emitting device D 1 , the electric conductor  34  is disposed on the upper wall surface  56  such that the ratio of the area of the electric conductor  34  to the area of the upper wall surface  56  is 50% or more. Therefore, the heat dissipation through the electric conductor  34  is enhanced in the light-emitting device D 1 . 
     In the light-emitting device D 1 , the electric conductor  34  is disposed on the outer wall surface  54  such that the ratio of the area of the electric conductor  34  to the area of the outer wall surface  54  is 50% or more. Therefore, the heat dissipation through the electric conductor  34  is further enhanced in the light-emitting device D 1 . 
     In the light-emitting device D 1 , the electric conductor  34  is disposed on the outer wall surface  54  and the outer side surface  48  such that the ratio of the area of the electric conductor  34  to the sum of the area of the outer wall surface  54  and the area of the outer side surface  48  is 50% or more. Therefore, the heat dissipation through the electric conductor  34  is further enhanced in the light-emitting device D 1 . 
     In the light-emitting device D 1 , the electric conductor  34  is not disposed to the corner portion  31  and the ridge portion  33  of the package  30 . Therefore, peeling of the electric conductor  34  starting from the corner portion  31  and the ridge portion  33  is reduced in the light-emitting device D 1 . 
     In the light-emitting device D 1 , the light source  10  is stably mounted on the window  20  through the dummy pad  28 . The dummy pad  28  mounts the light source  10 , and thus the dummy pad  28  efficiently receives and dissipates the heat generated in the light source  10 . 
     In the light-emitting device D 1 , each of the connectors CN 1  include the third pad  26  mounting the light source  10 , and the electrically conductive line  27  electrically connecting the first pad  25  and the third pad  26 . The light source  10  is mounted through the third pad  26 , and the first pad  25  and the third pad  26  are electrically connected through the electrically conductive line  27 . The light source  10  is mounted on the third pad  26 , and is electrically connected to the first pad  25 . 
     In the light-emitting device D 1 , the silicon substrate of the window base  21  has high thermal conductivity. The window base  20  increases thermal conduction to the electric conductor  34 . This increase of thermal conduction enables a decrease in the area of the electrically conductive body WD 1 . In a case where the area of the electrically conductive body WD 1  is decreased, the electrically conductive body WD 1  decreases an amount of the light from the reflection portion  32  blocked through the electrically conductive body WD 1  itself. 
     Hereinafter, a method for making the light-emitting device D 1  will be described with reference to  FIGS. 7 to 11 .  FIG. 7  is a flowchart illustrating a method for making the light-emitting device according to the first embodiment.  FIGS. 8, 9, 10, and 11  are views schematically illustrating a main process in the method for making the light-emitting device according to the first embodiment.  FIG. 8( a )  is a schematic view illustrating a cross-sectional configuration of a window base used in the method for making the light-emitting device according to the first embodiment.  FIG. 8( b )  is a view illustrating an electric conductor pattern on the window in the method for making the light-emitting device according to the first embodiment, and  FIG. 8( c )  is a view illustrating a light source mounted on the electric conductor pattern in  FIG. 8( b ) .  FIG. 9( a )  is a view illustrating a block in which a plurality of packages are connected in an array from an upper wall surface side of the package, and  FIG. 9( b )  is an enlarged view illustrating the packages of  FIG. 9( a ) .  FIG. 10( a )  is a view illustrating the block from a bottom surface side of the package, and  FIG. 10( b )  is an enlarged view illustrating the packages of  FIG. 10( a ) .  FIG. 11  is a diagram illustrating separation of the block. 
     (Preparation of Window) 
     In process S 1 , the window  20  is prepared. First, in process Sla, a transparent substrate for forming the window base  21  is prepared. The window base  21  of the transparent substrate is, for example, a silicon substrate. If necessary, an antireflection film AR is formed on the lower surface  23  of the window base  21 . In this case, the window  20  includes the antireflection film AR disposed on the lower surface  23 . The antireflection film AR effectively reduces light reflection of infrared light having wavelengths of 3 to 5 μm generated in a transparent substrate, for example. The antireflection film AR may be formed on the light exit surface  22  of the window base  21 . In this case, the window  20  includes the antireflection film AR disposed on the light exit surface  22 . The antireflection film AR may be formed on the lower surface  23  and the light exit surface  22 . In this case, the window  20  includes the antireflection film AR disposed on the lower surface  23  and the antireflection film AR disposed on the light exit surface  22 . The configuration in which the antireflection film AR is disposed on the lower surface  23  and the light exit surface  22  more effectively reduces light reflection of infrared light having wavelengths of 3 to 5 μm generated in a transparent substrate, for example. 
     Next, in process S 1   b , first, a plurality of first pads  25  and a plurality of electrically conductive lines  27  of the electrically conductive body WD 1  are formed on the lower surface  23  of the window base  21 . In forming the electrically conductive body WD 1 , for example, Cu plating, Ni plating, and Au plating are performed in this order to form a electric conductor pattern of Cu—Ni—Au metal plating. The Au layer is positioned on the uppermost layer of the metal plating of the electric conductor pattern. The electric conductor pattern is formed, for example, such that one section of electrically conductive bodies WD 1  are arranged one-dimensionally or two-dimensionally. The first pad  25  includes, for example, the first pad body  63  and the second pad body  64 , and the electrically conductive line  27  includes the first electrically conductive line  81  and the second electrically conductive line  82 . 
     Next, in process S 1   b , a plurality of third pads  26  and dummy pads  28  in the electrically conductive body WD 1  are formed to mount the light source  10  on the lower surface  23  of the window base  21 . The third pad  26  includes, for example, the first mounting pad body  61  and the second mounting pad body  62 . The dummy pad  28  includes, for example, the first dummy pad body  71  and the second dummy pad body  72 . In forming the electrically conductive body WD 1 , for example, a cream solder is applied on the electric conductor pattern. A cream solder  26   a  for forming the third pad  26  includes, for example, a solder  61   a  for forming the first mounting pad body  61  and a solder  62   a  for forming the second mounting pad body  62 . A cream solder  28   a  for forming the dummy pads  28  includes a solder  71   a  for forming the first dummy pad body  71  and a solder  72   a  for forming the second dummy pad body  72 . The solder  61   a  and the solder  62   a  are applied to be positioned on the end edge of the electrically conductive line  27 . For example, the end edge of the first electrically conductive line  81  is positioned between the window base  21  and the solder  61   a  along the direction Ax 1 . The cream solder includes, for example, Sn, a metal having a melting point higher than the melting point of Sn, and a flux. 
     In process S 1   c , the light source  10  is mounted on the applied cream solder. In this mounting, heat treatment (reflow) is performed to melt the printed cream solder, whereby the light source  10  is mounted on the cream solder. The light source  10  is mounted such that the anode terminal  14  and the cathode terminal  16  of the light source  10  are electrically connected to, for example, the first mounting pad body  61  and the second mounting pad body  62 , respectively. The cream solder is cooled after the light source  10  is mounted. From this cooling, the cream solder is solidified, and the light source  10  is fixed on the pad. The light source  10  is also fixed with the first dummy pad body  71  and the second dummy pad body  72  together with the first mounting pad body  61  and the second mounting pad body  62 . 
     In process S 1   c , next, the underfill UF is injected into a gap generated between the lower surface  23 , the third pad  26 , the dummy pad  28 , and the light source  10  to form a substrate product SP 1 . The substrate product SP 1  includes a plurality of one-section electrically conductive bodies WD 1  arranged one-dimensionally or two-dimensionally. The underfill UF includes, for example, an epoxy resin. 
     In process S 1   d , the substrate product SP 1  is separated to form a plurality of windows  20  separated for each section. The separation of the substrate product SP 1  is performed, for example, using a blade dicing method, and the substrate product SP 1  is cut along cutting lines C 1  to C 4  such that the substrate product SP 1  is separated by one section. Electric conductor pattern may or may not be formed on the cutting lines C 1  to C 4 . When electric conductor patterns are not formed on the cutting lines C 1  to C 4 , an interval between the electric conductor patterns adjacent to each other with the cutting lines C 1  to C 4  interposed therebetween may be, for example, wider than the width of the blade used in the blade dicing method. Each of the windows  20  of one section separated by cutting is two-dimensionally arranged on a chip tray, for example. After process S 1   b , the window  20  is prepared. 
     (Preparation of Block) 
     In process S 2 , a block AG 1  is prepared. First, in process S 2   a , a preparation body of the block AG 1  is formed such that a plurality of packages  30  are connected in an array. In the preparation body, a plurality of package preparation bodies prepared to form the package  30  before the reflection portion and the electric conductor are coupled in an array, and are made using, for example, an injection molding method. The preparation body includes a plurality of package preparation bodies and a substrate portion SB 1  supporting the package preparation bodies. The substrate portion SB 1  is installed to surround the plurality of package preparation bodies. The preparation body includes a plurality of package preparation bodies arranged one-dimensionally or two-dimensionally in the substrate portion SB 1 . 
     In the present embodiment, the preparation body includes, for example, four package preparation bodies, and these package preparation bodies are arranged in two rows and two columns. The package preparation body has the same outer shape as the package  30  except for the reflection portion and the electric conductor disposed on the surface of the package  30 . The material contained in the package preparation body may be the same as the material of the substrate portion SB 1 , and is, for example, a ceramic or a polyphthalamide (PPA) resin. 
     In the preparation body, the upper wall surface  56  of the package preparation body may be substantially flush with a front surface FP of the substrate portion SB 1 . A distance from a back surface BP of the substrate portion SB 1  to the bottom surface  46  of the package preparation body is larger than, for example, a distance from the front surface FP of the substrate portion SB 1  to the back surface BP, that is, the thickness of the substrate portion SB 1 . In process S 2   a , plasma treatment is performed on the surface of the preparation body for activating the surface as necessary. 
     Next, in process S 2   b , metallizing for forming a metal thin film containing Cu, for example, is performed on the surface of the preparation body subjected to process S 2   a . After preparation of the thin film, patterning for forming the reflection portion  32  and the electric conductor  34  is performed using, for example, a laser patterning method. Due to patterning, in process S 2   b , for example, metal plating is formed by using an electrically conductive base BW 1  disposed on the surface of the preparation body. The electrically conductive base BW 1  is disposed to surround the four package preparation bodies, and is electrically connected to the four package preparation bodies. The electrically conductive base BW 1  conducts electricity necessary for forming metal plating for the four package preparation bodies. Due to conducting electricity from the electrically conductive base BW 1 , electric Cu plating is formed in a region where the electric conductor  34  is disposed. The electrically conductive base BW 1  includes an electrically conductive body of the reflection portion  45   p  for forming the first reflection portion electric conductor  45   a  and the second reflection portion electric conductor  45   b . The reflection portion  32  is formed due to conducting electricity from the electrically conductive body of the reflection portion  45   p.    
     For example, Ni plating and subsequent Au plating are further formed on the disposed Cu plating. The reflection portion  32  and the electric conductor  34  including Cu—Ni—Au metal plating are formed. In the present embodiment, the Au layer is positioned on the uppermost layer of the metal plating. The block AG 1  including the package  30  is prepared after forming the metal plating. 
     In the block AG 1 , in each package  30 , the first outer electric conductor  35   a  is formed on the first outer wall surface  54   a , and the third outer electric conductor  35   c  is formed on the third outer wall surface  54   c . In the block AG 1 , a gap GP 1  exists between one package  30  and another package  30  arranged along a direction Bx 1  from the first outer wall surface  54   a  to the third outer wall surface  54   c . The package  30  and the gap GP 1  are alternately arranged. The gap GP 1  is, for example, a work region for forming the first outer electric conductor  35   a  and the third outer electric conductor  35   c  on the first outer wall surface  54   a  and the third outer wall surface  54   c , respectively. 
     (Mounting of Window) 
     In process S 3 , the window  20  is mounted on each package  30  of the block AG 1 . In process S 3 , the window  20  is mounted on the placement surface  44  such that the first pad  25  of the window  20  is electrically connected to the second pad  36  of the placement surface  44 . The window  20  is mounted on the placement surface  44  through, for example, an electrically conductive resin. The window  20  is fixed to the package  30  through the adhesiveness of the electrically conductive resin. 
     (Separation of Block) 
     In process S 4 , the block AG 1  is separated to obtain a plurality of packages  30  on which the corresponding windows  20  are mounted. The separation of the block AG 1  is performed due to, for example, blade dicing. In the present embodiment, when the block AG 1  is separated, the block AG 1  is diced along cutting planned lines CT 1  to CT 4  set between the packages  30  adjacent to each other after the upper wall surface  56  is attached to a dicing tape DT 1 . 
     The cutting planned lines CT 1  to CT 4  are positioned in the direction Bx 1  from the first outer wall surface  54   a  to the third outer wall surface  54   c . From cutting due to dicing, the second outer wall surface  54   b  and the fourth outer wall surface  54   d  are separated from the block AG 1 . After this separation, the plurality of packages  30  on which the corresponding windows  20  are mounted are cut for each section, and the making of the light-emitting device D 1  is completed. 
     In a method MT 1  for making the light-emitting device, the wall portion  50  of the package  30  is disposed along the window base  21 . Thus, when the window  20  is mounted in each package  30  of the block AG 1 , the window  20  is mounted with the wall portion  50  (among these, in particular, the inner wall surface  52 ) of the package  30  as a mark. Since the mark exists, the window  20  is easily mounted on each package  30  of the block AG 1  such that the first pad  25  and the second pad  36  corresponding to each other are electrically connected. 
     In the method M 1  for making the light-emitting device, the height from the placement surface  44  to the upper wall surface  56  is larger than the height from the placement surface  44  to the light exit surface  22  in a state where the window  20  is mounted to correspond to each package  30  of the block AG 1 . 
     According to the method M 1  for making the light-emitting device, the height from the placement surface  44  to the upper wall surface  56  is larger than the height from the placement surface  44  to the light exit surface  22 . Thus, only the upper wall surface  56  is attached to the dicing tape when the block AG 1  is separated due to dicing. The lower surface  23  of the window base  21  does not come into contact with the dicing tape DT 1 , and the window base  21  is prevented from being deteriorated due to adhesion of the adhesive. When the block AG 1  is separated due to dicing, water may be poured on the block AG 1  for washing away dicing powder generated due to dicing and cooling, for example. However, the height from the placement surface  44  to the upper wall surface  56  may be larger than the height from the placement surface  44  to the light exit surface  22 . Thus, entry of water into the window base  21  is effectively suppressed through the wall portion  50  disposed along the window base  21 . An occurrence of an electrical short circuit due to adhesion of water, an increase in light absorption due to water, or deterioration of the window base  21  due to adhesion of water is reduced. 
     Second Embodiment 
     Next, a configuration of a light-emitting device according to a second embodiment will be described.  FIG. 12( a )  is a plan view of a window according to the second embodiment, and  FIG. 12( b )  is a front view of the window according to the second embodiment.  FIG. 12( c )  is a plan view of the window on which a light source according to the second embodiment is mounted, and  FIG. 12( d )  is a front view of the window on which the light source according to the second embodiment is mounted. The light-emitting device according to the second embodiment has the same configuration as the light-emitting device D 1  according to the first embodiment except for the window  20 . 
     A window  20   p  according to the second embodiment will be described below with reference to  FIGS. 12( a ) to 12( d ) . The window  20   p  includes the window base  21  and an electrically conductive body WD 1   p . The window base  21  includes the light exit surface  22  and the lower surface  23  opposing the light exit surface  22 . The electrically conductive body WD 1   p  is disposed on the lower surface  23  of the window base  21 . 
     A light source  10   p  of the present embodiment includes, for example, a light-emitting diode and has a surface mounting type rectangular parallelepiped shape. One surface of the light source  10   p  is a terminal surface  12   p . One of the anode terminal  14  and a cathode terminal  16   p , for example, the anode terminal  14  is disposed on the terminal surface  12   p . The light source  10   p  includes a radiation surface  18   p  on the opposite side of the terminal surface  12   p . In the present embodiment, for example, the other of the anode terminal  14  and the cathode terminal  16   p , for example, the cathode terminal  16   p  is disposed on the radiation surface  18   p.    
     The electrically conductive body WD 1   p  on the window base  21  includes a plurality of first pads  25   p . The plurality of first pads  25   p  oppose the placement surface  44  and are disposed in a peripheral region surrounding the central region in the window  20   p . In the present embodiment, the plurality of first pads  25   p  include, for example, a first pad body  63   p  and a second pad body  64   p . For example, the first pad body  63   p  is disposed from the first corner portion  29   a  to the second corner portion  29   b  on the first side portion  21   a . The second pad body  64   p  is disposed from the third corner portion  29   c  to the fourth corner portion  29   d  on the third side portion  21   c.    
     For example, the first pad body  63   p  includes the first connection portion  63   a  at one end edge of the first pad body  63   p , and the second connection portion  63   b  at another end edge of the first pad body  63   p . The first connection portion  63   a  is disposed at the first corner portion  29   a . The second connection portion  63   b  is disposed at the second corner portion  29   b . The first connection portion  63   a  and the second connection portion  63   b  electrically connect the first pad body  63   p  and the electric conductor  34  disposed in the package  30 . 
     For example, the second pad body  64   p  includes the third connection portion  64   a  at one end edge of the second pad body  64   p , and the fourth connection portion  64   b  at another end edge of the second pad body  64   p . The third connection portion  64   a  is disposed at the third corner portion  29   c . The fourth connection portion  64   b  is disposed at the fourth corner portion  29   d . The third connection portion  64   a  and the fourth connection portion  64   b  connect the second pad body  64   p  and the electric conductor  34  disposed in the package  30 . 
     The electrically conductive body WD 1   p  on the window base  21  further includes a plurality of connectors CN 1   p . One connector CN 1   a  of the plurality of connectors CN 1   p  includes a third pad  26   p . The light source  10   p  is mounted on the third pad  26   p . The third pad  26   p  is disposed on a region where the light source  10   p  is mounted on the window base  21 , for example, a central region of the window base  21 . In the present embodiment, the third pad  26   p  includes, for example, the first mounting pad body  61 . For example, the first mounting pad body  61  is electrically connected to the anode terminal  14  positioned on the terminal surface  12   p  of the light source  10   p.    
     The window  20   p  includes a dummy pad  28   p  disposed on the lower surface  23 . The light source  10   p  is mounted on the dummy pad  28   p . The dummy pad  28   p  includes, for example, the first dummy pad body  71 , the second dummy pad body  72 , and a third dummy pad body  73 . The first dummy pad body  71 , the second dummy pad body  72 , and the third dummy pad body  73  support the light source  10   p  together with the first mounting pad body  61 . The first dummy pad body  71 , the second dummy pad body  72 , and the third dummy pad body  73  support the light source  10   p , but are not electrically connected to the light source  10   p.    
     For example, the first mounting pad body  61 , the first dummy pad body  71 , the second dummy pad body  72 , and the third dummy pad body  73  may be positioned in this order at respective vertexes of a quadrangle virtually drawn in a region of the lower surface  23  where the light source  10   p  is mounted. If necessary, the window  20   p  includes the underfill UF. The underfill UF is disposed to fill a gap generated between the lower surface  23 , the third pad  26   p , the dummy pad  28   p , and the light source  10   p.    
     In the present embodiment, for example, the light source  10   p  is supported with the four pads, that is, the first mounting pad body  61 , the first dummy pad body  71 , the second dummy pad body  72 , and the third dummy pad body  73 . Thus, the light source  10   p  is stably mounted on the window  20   p . The heat generated from the light source  10   p  is efficiently conducted to the electrically conductive body WD 1   p  particularly through the first mounting pad body  61 . 
     One connector CN 1   a  of the plurality of connectors CN 1   p  further includes an electrically conductive line  2 ′ 7   p . The electrically conductive line  27   p  electrically connects the first pad  25   p  and the third pad  26   p  corresponding to each other. For example, the electrically conductive line  27   p  electrically connects the first pad body  63   p  of the first pad  25   p  and the first mounting pad body  61  of the third pad  26   p.    
     The electrically conductive line  2 ′ 7   p  includes, for example, the first electrically conductive line  81 . The first electrically conductive line  81  electrically connects the first pad body  63   p  and the first mounting pad body  61 . For example, one end edge of the first electrically conductive line  81  is connected to the first pad body  63   p  to cross the first pad body  63   p . For example, another end edge of the first electrically conductive line  81  is connected to the first mounting pad body  61 . One end edge of the first electrically conductive line  81  and the first pad body  63   p  intersect, for example, near the center of the first pad body  63   p . The other end edge of the first electrically conductive line  81  is positioned, for example, between the window base  21  and the first mounting pad body  61  in the direction Ax 1 . 
     Among the plurality of connectors CN 1   p , a connector CN 1   b  different from the one connector CN 1   a  includes a fourth pad  65   p  and a line  82   p . The fourth pad  65   p  includes, for example, a second connection pad  65   b . The second connection pad  65   b  is electrically connected to the first pad  25   p  (first pad body  63   p ) in the middle of the third connection portion  64   a  and the fourth connection portion  64   b . The line  82   p  electrically connects the fourth pad  65   p  (second connection pad  65   b ) and the light source  10   p . The first pad  25   p  and the light source  10   p  are electrically connected through the fourth pad  65   p  and the line  82   p . For example, one end edge of the line  82   p  is connected to the fourth pad  65   p  (second connection pad  65   b ). For example, the other end edge of the line  82   p  is connected to the cathode terminal  16   p  of the light source  10   p . For example, the line  82   p  electrically connects the cathode terminal  16   p  positioned on the radiation surface  18   p  of the light source  10   p  and the fourth pad  65   p  (second connection pad  65   b ). The line  82   p  is, for example, a second bonding line  82   b.    
     In the light-emitting device according to the present embodiment, the light source  10   p  is mounted on the third pad  26   p  of one connector CN 1   a , and the first pad  25   p  and the third pad  26   p  are electrically connected through the electrically conductive line  2 ′ 7   p  of one connector CN 1   a . The light source  10   p  is mounted on the third pad  26   p , and is electrically connected to the first pad  25   p . The light source  10   p  and the fourth pad  65   p  are electrically connected through the wire  82   p  of another connector CN 1   b . The fourth pad  65   p  is electrically connected to the first pad  25   p . The light source  10   p  is electrically connected to the first pad  25   p  through the wire  82   p.    
     Third Embodiment 
     Next, a configuration of a light-emitting device according to a third embodiment will be described.  FIG. 13( a )  is a plan view of a window according to the third embodiment, and  FIG. 13( b )  is a front view of the window according to the third embodiment.  FIG. 13( c )  is a plan view of the window on which a light source according to the third embodiment is mounted, and  FIG. 13( d )  is a front view of the window on which the light source according to the third embodiment is mounted. The light-emitting device according to the third embodiment has the same configuration as the light-emitting device D 1  according to the first embodiment except for the window  20 . 
     Hereinafter, a window  20   q  according to the third embodiment will be described with reference to  FIGS. 13( a ) to 13( d ) . The window  20   q  includes the window base  21  and an electrically conductive body WD 1   q . The window base  21  includes the light exit surface  22  and the lower surface  23  opposing the light exit surface  22 . The electrically conductive body WD 1   q  is disposed on the lower surface  23  of the window base  21 . 
     A light source  10   q  of the present embodiment includes, for example, a light-emitting diode and has a surface mounting type rectangular parallelepiped shape. One surface of the light source  10   q  is a terminal surface  12   q . The light source  10   q  includes a radiation surface  18   q  on the opposite side of the terminal surface  12   q , and light is emitted from the radiation surface  18   q  to the reflection portion  32 . In the present embodiment, for example, an anode terminal  14   q  and a cathode terminal  16   q  are disposed on the radiation surface  18   q.    
     The electrically conductive body WD 1   p  on the window base  21  includes a plurality of first pads  25   q . The plurality of first pads  25   q  oppose the placement surface  44  and are disposed in a peripheral region surrounding the central region in the window  20   q . In the present embodiment, the plurality of first pads  25   q  include for example, a first pad body  63   q  and a second pad body  64   q . For example, the first pad body  63   q  is disposed from the first corner portion  29   a  to the second corner portion  29   b  on the first side portion  21   a . The second pad body  64   q  is disposed from the third corner portion  29   c  to the fourth corner portion  29   d  on the third side portion  21   c.    
     For example, the first pad body  63   q  includes the first connection portion  63   a  at one end edge of the first pad body  63   q , and the second connection portion  63   b  at the other end edge of the first pad body  63   q . The first connection portion  63   a  is disposed at the first corner portion  29   a . The second connection portion  63   b  is disposed at the second corner portion  29   b . The first connection portion  63   a  and the second connection portion  63   b  electrically connect the first pad body  63   q  and the electric conductor  34  disposed in the package  30 . 
     The second pad body  64   q  includes, for example, the third connection portion  64   a  and the fourth connection portion  64   b . The third connection portion  64   a  is positioned at one end edge of the second pad body  64   q . The fourth connection portion  64   b  is positioned at another end edge of the second pad body  64   q . The third connection portion  64   a  is disposed at the third corner portion  29   c . The fourth connection portion  64   b  is disposed at the fourth corner portion  29   d . The third connection portion  64   a  and the fourth connection portion  64   b  connect the second pad body  64   q  and the electric conductor  34  disposed in the package  30 . 
     The window  20   q  includes a dummy pad  28   q  disposed on the lower surface  23 . The light source  10   q  is mounted on the dummy pad  28   q . The dummy pad  28   q  includes, for example, the first dummy pad body  71 , the second dummy pad body  72 , the third dummy pad body  73 , and a fourth dummy pad body  74 . The first dummy pad body  71 , the second dummy pad body  72 , the third dummy pad body  73 , and the fourth dummy pad body  74  support the light source  10   q . The first dummy pad body  71 , the second dummy pad body  72 , the third dummy pad body  73 , and the fourth dummy pad body  74  support the light source  10   q  but are not electrically connected to the light source  10   q.    
     The first dummy pad body  71 , the second dummy pad body  72 , the third dummy pad body  73 , and the fourth dummy pad body  74  are positioned, for example, in this order at respective vertexes of a quadrangle virtually drawn in a region of the lower surface  23  where the light source  10   q  is mounted. If necessary, the window  20   q  includes the underfill UF. The underfill UF is disposed to fill a gap generated between the lower surface  23 , the dummy pad  28   q , and the light source  10   q.    
     In the present embodiment, for example, the light source  10   q  is supported with four dummy pads, that is, the first dummy pad body  71 , the second dummy pad body  72 , the third dummy pad body  73 , and the fourth dummy pad body  74 . Therefore, the light source  10   q  is stably mounted on the window  20   q.    
     The electrically conductive body WD 1   q  on the window base  21  further includes a plurality of connectors CN 1   q , and each of the connectors CN 1   q  includes a fourth pad  65   q  and a wire  82   q . The fourth pad  65   q  includes, for example, a first connection pad  65   a  and a second connection pad  65   b . The wire  82   q  includes, for example, the first bonding wire  82   a  and the second bonding wire  82   b.    
     The first connection pad  65   a  is electrically connected to the first pad  25   q  (first pad body  63   q ) in the middle between the first connection portion  63   a  and the second connection portion  63   b . The second connection pad  65   b  is electrically connected to the first pad  25   q  (second pad body  64   q ) in the middle between the third connection portion  64   a  and the fourth connection portion  64   b . The wire  82   q  electrically connects the fourth pad  65   q  and the light source  10   q . The first pad  25   q  and the light source  10   q  are electrically connected through the fourth pad  65   q  and the wire  82   q . For example, one end edge of the first bonding wire  82   a  is connected to the fourth pad  65   q  (first connection pad  65   a ). For example, another end edge of the first bonding wire  82   a  is connected to the anode terminal  14   q  of the light source  10   q . For example, the second bonding wire  82   b  electrically connects the cathode terminal  16   q  positioned on the radiation surface  18   q  of the light source  10   q  and the fourth pad  65   q  (second connection pad  65   b ). 
     In the light-emitting device according to the present embodiment, the light source  10   q  and the fourth pad  65   q  are electrically connected through the wire  82   q  of each connector CN 1   q . The fourth pad  65   q  is electrically connected to the first pad  25   q . The light source  10   q  is electrically connected to the first pad  25   q  through the wire  82   q.    
     Fourth Embodiment 
     Next, a configuration of a light-emitting device D 2  according to a fourth embodiment will be described.  FIG. 14( a )  is a plan view of a light-emitting device according to the fourth embodiment, and  FIG. 14( b )  is a side view of the light-emitting device according to the fourth embodiment.  FIG. 14( c )  is a front view of the light-emitting device according to the fourth embodiment, and  FIG. 14( d )  is a bottom view of the light-emitting device according to the fourth embodiment. The light-emitting device D 2  according to the fourth embodiment has the same configuration as the light-emitting device D 1  according to the first embodiment except for an electric conductor  34   m.    
     As illustrated in  FIGS. 14( a ) to 14( d ) , a package  30   m  according to the fourth embodiment includes the electric conductor  34   m . The electric conductor  34   m  is disposed on the placement surface  44 , the inner wall surface  52 , and the upper wall surface  56 . In the present embodiment, unlike the first embodiment, the electric conductor  34   m  is disposed on the placement surface  44 , the inner wall surface  52 , and the upper wall surface  56 , but is not disposed on the outer wall surface  54  and the outer side surface  48 . 
     The electric conductor  34   m  includes, for example, a first upper electric conductor  39   e  and a third upper electric conductor  39   f  on the upper wall surface  56 . The first upper electric conductor  39   e  is disposed on the first upper wall surface  56   a , the second upper wall surface  56   b , and the fourth upper wall surface  56   d  except for the first corner portion  31   a  and the second corner portion  31   b . The third upper electric conductor  39   f  is disposed on the second upper wall surface  56   b , the third upper wall surface  56   c , and the fourth upper wall surface  56   d  except for the third corner portion  31   c  and the fourth corner portion  31   d . The electric conductor  34   m  is not disposed on the corner portion  31 . 
     The first upper electric conductor  39   e  may be disposed in a region of 50% or more of the area of the first upper wall surface  56   a  on the first upper wall surface  56   a . The third upper electric conductor  39   f  may be disposed in a region of 50% or more of the area of the third upper wall surface  56   c  on the third upper wall surface  56   c . That is, the electric conductor  34   m  may be disposed on the upper wall surface  56  such that the ratio of the area of the electric conductor  34   m  to the area of the upper wall surface  56  is 50% or more. On the upper wall surface  56 , a configuration in which the ratio of the area of the electric conductor  34   m  to the area of the upper wall surface  56  is 50% or more enhances the heat dissipation through the electric conductor  34   m.    
     Fifth Embodiment 
     Next, a configuration of a light-emitting device D 3  according to a fifth embodiment will be described.  FIG. 15( a )  is a plan view of a light-emitting device according to the fifth embodiment, and  FIG. 15( b )  is a side view of the light-emitting device according to the fifth embodiment.  FIG. 15( c )  is a front view of the light-emitting device according to the fifth embodiment, and  FIG. 15( d )  is a bottom view of the light-emitting device according to the fifth embodiment. The light-emitting device D 3  according to the fifth embodiment has the same configuration as the light-emitting device D 1  according to the first embodiment except for an electric conductor  34   n.    
     As illustrated in  FIGS. 15( a ) to 15( d ) , a package  30   n  according to the fifth embodiment includes the electric conductor  34   n , and the electric conductor  34   n  is disposed on the placement surface  44 , the inner wall surface  52 , the upper wall surface  56 , and the outer wall surface  54 . In the present embodiment, unlike the first embodiment, the electric conductor  34   n  is disposed on the placement surface  44 , the inner wall surface  52 , the upper wall surface  56 , and the outer wall surface  54 , but is not disposed on the outer side surface  48 . 
     The electric conductor  34   n  includes, for example, a first upper electric conductor  39   g  and a third upper electric conductor  39   h  on the upper wall surface  56 . The first upper electric conductor  39   g  is disposed on the first upper wall surface  56   a , the second upper wall surface  56   b , and the fourth upper wall surface  56   d  except for the first corner portion  31   a  and the second corner portion  31   b . The third upper electric conductor  39   h  is disposed on the second upper wall surface  56   b , the third upper wall surface  56   c , and the fourth upper wall surface  56   d  except for the third corner portion  31   c  and the fourth corner portion  31   d . The electric conductor  34   n  is not disposed on the corner portion  31 . 
     The first upper electric conductor  39   g  may be disposed in a region of 50% or more of the area of the first upper wall surface  56   a  on the first upper wall surface  56   a . The third upper electric conductor  39   h  may be disposed in a region of 50% or more of the area of the third upper wall surface  56   c  on the third upper wall surface  56   c . That is, the electric conductor  34   n  may be disposed on the upper wall surface  56  such that the ratio of the area of the electric conductor  34   n  to the area of the upper wall surface  56  is 50% or more. On the upper wall surface  56 , a configuration in which the ratio of the area of the electric conductor  34   n  to the area of the upper wall surface  56  is 50% or more enhances the heat dissipation through the electric conductor  34   n.    
     The package  30  includes a first outer electric conductor  35   g  disposed on the first outer wall surface  54   a . The package  30  includes a third outer electric conductor  35   h  on the third outer wall surface  54   c . The first outer electric conductor  35   g  is electrically connected to the first upper electric conductor  39   g . The third outer electric conductor  35   h  is electrically connected to the third upper electric conductor  39   h . The first outer electric conductor  35   g  is not disposed on the first ridge portion  33   a  and the second ridge portion  33   b . The third outer electric conductor  35   h  is not disposed on the third ridge portion  33   c  and the fourth ridge portion  33   d . The electric conductor  34   n  is not disposed on the ridge portion  33 . 
     The first outer electric conductor  35   g  may be disposed in a region of 50% or more of the area of the first outer wall surface  54   a  on the first outer wall surface  54   a . The third outer electric conductor  35   h  may be disposed in a region of 50% or more of the area of the third outer wall surface  54   c  on the third outer wall surface  54   c . That is, the electric conductor  34   n  may be disposed on the outer wall surface  54  such that the ratio of the area of the electric conductor  34   n  to the area of the outer wall surface  54  is 50% or more. A configuration in which the ratio of the area of the electric conductor  34   n  to the area of the outer wall surface  54  is 50% or more enhances the heat dissipation through the electric conductor  34   n  on the outer wall surface  54 . 
     Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof. 
     This specification discloses the following supplementary notes. 
     (Supplementary Note 1) 
     A light-emitting device including: 
     a light source; 
     a window mounting the light source; and 
     a package defining a space with the window, the light source being disposed in the space, wherein 
     the window includes 
     a window base including a light exit surface, a lower surface, opposing the light exit surface, and a side surface coupling the light exit surface and the lower surface, and 
     an electrically conductive body disposed on the lower surface of the window base, 
     the package includes 
     a base portion formed with a recess open toward the lower surface, the base portion including a placement surface disposed along an edge of the recess and opposing the lower surface, a bottom surface opposing the placement surface, and an outer side surface coupled to the bottom surface, 
     a wall portion including an inner wall surface coupled to the placement surface and opposing the side surface, an outer wall surface opposing the inner wall surface and coupled to the outer side surface, and an upper wall surface coupling the inner wall surface and the outer wall surface, the wall portion disposed along the window base when viewed from a direction orthogonal to the light exit surface, 
     a reflection portion disposed on a surface of the recess, being configured to reflect light emitted from the light source to the window, and 
     an electric conductor disposed on the placement surface, the inner wall surface, and the upper wall surface, 
     the window base is configured to transmit the light reflected on the reflection portion, 
     the electrically conductive body includes a plurality of first pads opposing the placement surface, and a plurality of connectors electrically connecting the light source and the plurality of first pads, and 
     the electric conductor includes a plurality of second pads disposed on the placement surface to oppose corresponding first pads of the plurality of first pads and electrically connected to the corresponding first pads. 
     (Supplementary Note 2) 
     The light-emitting device according to supplementary note 1, wherein the electric conductor is further disposed on the bottom surface. 
     (Supplementary Note 3) 
     The light-emitting device according to supplementary note 1 or 2, wherein height from the placement surface to the upper wall surface is larger than height from the placement surface to the light exit surface. 
     (Supplementary Note 4) 
     The light-emitting device according to any one of supplementary notes 1 to 3, wherein 
     the package has a polygonal shape when viewed from the direction orthogonal to the light exit surface, 
     the number of the outer side surfaces and the outer wall surfaces is plural, respectively, and 
     the electric conductor is not disposed on a corner portion defined by the upper wall surface and the outer wall surfaces adjacent to each other, on a ridge portion defined by the outer wall surfaces adjacent to each other, and on a ridge portion defined by the outer side surfaces adjacent to each other. 
     (Supplementary Note 5) 
     The light-emitting device according to any one of supplementary notes 1 to 4, wherein the electric conductor is disposed on the upper wall surface such that a ratio of an area of the electric conductor to an area of the upper wall surface is 50% or more. 
     (Supplementary Note 6) 
     The light-emitting device according to any one of supplementary notes 1 to 5, wherein the window includes a dummy pad disposed on the lower surface and mounting the light source. 
     (Supplementary Note 7) 
     The light-emitting device according to any one of supplementary notes 1 to 6, wherein each of the connectors includes a third pad mounting the light source is mounted, and an electrically conductive line electrically connecting the first pad and the third pad. 
     (Supplementary Note 8) 
     The light-emitting device according to any one of supplementary notes 1 to 6, wherein 
     one connector of the plurality of connectors includes a third pad mounting the light source is mounted, and an electrically conductive line electrically connecting the first pad and the third pad, and 
     another connector of the plurality of connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the light source and the fourth pad. 
     (Supplementary Note 9) 
     The light-emitting device according to any one of supplementary notes 1 to 6, wherein each of the connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the light source and the fourth pad. 
     (Supplementary Note 10) 
     The light-emitting device according to any one of supplementary notes 1 to 9, wherein the window base is a silicon substrate. 
     (Supplementary Note 11) 
     The light-emitting device according to supplementary note 10, wherein 
     the window includes an antireflection film disposed on at least one surface of the light exit surface and the lower surface. 
     In the present embodiment of supplementary note 1, the electric conductor is disposed on the placement surface, the inner wall surface, and the upper wall surface, but is not disposed on the outer wall surface and the outer side surface. 
     This specification also discloses the following supplementary notes. 
     (Supplementary Note 12) 
     A light-emitting device including: 
     a light source; 
     a window mounting the light source; and 
     a package defining a space with the window, the light source being disposed in the space, wherein 
     the window includes 
     a window base including a light exit surface, a lower surface opposing the light exit surface, and a side surface coupling the light exit surface and the lower surface, and 
     an electrically conductive body disposed on the lower surface of the window base, 
     the package includes 
     a base portion formed with a recess open toward the lower surface, the base portion including a placement surface disposed along an edge of the recess and opposing the lower surface, a bottom surface opposing the placement surface, and an outer side surface coupled to the bottom surface, 
     a wall portion including an inner wall surface coupled to the placement surface and opposing the side surface, an outer wall surface opposing the inner wall surface and coupled to the outer side surface, and an upper wall surface coupling the inner wall surface and the outer wall surface, the wall portion disposed along the window base when viewed from a direction orthogonal to the light exit surface, 
     a reflection portion disposed on a surface of the recess, being configured to reflect light emitted from the light source to the window, and 
     an electric conductor disposed on the placement surface, the inner wall surface, the upper wall surface, and the outer wall surface, 
     the window base is configured to transmit the light reflected on the reflection portion, 
     the electrically conductive body includes a plurality of first pads opposing the placement surface, and a plurality of connectors electrically connecting the light source and the plurality of first pads, and 
     the electric conductor includes a plurality of second pads disposed on the placement surface to oppose corresponding first pads of the plurality of first pads and electrically connected to the corresponding first pads. 
     (Supplementary Note 13) 
     The light-emitting device according to supplementary note 12, wherein the electric conductor is further disposed on the bottom surface. 
     (Supplementary Note 14) 
     The light-emitting device according to supplementary note 12 or 13, wherein height from the placement surface to the upper wall surface is larger than height from the placement surface to the light exit surface. 
     (Supplementary Note 15) 
     The light-emitting device according to any one of supplementary notes 12 to 14, wherein 
     the package has a polygonal shape when viewed from the direction orthogonal to the light exit surface, 
     the number of the outer side surfaces and the outer wall surfaces is plural, respectively, and 
     the electric conductor is not disposed on a corner portion defined by the upper wall surface and the outer wall surfaces adjacent to each other, on a ridge portion defined by the outer wall surfaces adjacent to each other, and on a ridge portion defined by the outer side surfaces adjacent to each other. 
     (Supplementary Note 16) 
     The light-emitting device according to any one of supplementary notes 12 to 15, wherein the electric conductor is disposed on the upper wall surface such that a ratio of an area of the electric conductor to an area of the upper wall surface is 50% or more. 
     (Supplementary Note 17) 
     The light-emitting device according to any one of supplementary notes 12 to 16, wherein the electric conductor is disposed on the outer wall surface such that a ratio of an area of the electric conductor to an area of the outer wall surface is 50% or more. 
     (Supplementary Note 18) 
     The light-emitting device according to any one of supplementary notes 12 to 17, wherein the window includes a dummy pad disposed on the lower surface and mounting the light source. 
     (Supplementary Note 19) 
     The light-emitting device according to any one of supplementary notes 12 to 18, wherein each of the connectors includes a third pad mounting the light source is mounted, and an electrically conductive line electrically connecting the first pad and the third pad. 
     (Supplementary Note 20) 
     The light-emitting device according to any one of supplementary notes 12 to 18, wherein 
     one connector of the plurality of connectors includes a third pad mounting the light source is mounted, and an electrically conductive line electrically connecting the first pad and the third pad, and 
     another connector of the plurality of connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the light source and the fourth pad. 
     (Supplementary Note 21) 
     The light-emitting device according to any one of supplementary notes 12 to 18, wherein each of the connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the light source and the fourth pad. 
     (Supplementary Note 22) 
     The light-emitting device according to any one of supplementary notes 12 to 21, wherein the window base is a silicon substrate. 
     (Supplementary Note 23) 
     The light-emitting device according to supplementary note 22, wherein 
     the window includes an antireflection film disposed on at least one surface of the light exit surface and the lower surface. 
     In the embodiment of supplementary note 12, the electric conductor is disposed on the placement surface, the inner wall surface, the upper wall surface, and the outer wall surface, but is not disposed on the outer side surface. 
     This specification also discloses the following supplementary notes. 
     (Supplementary Note 24) 
     A light detection device comprising: 
     a photodetector; 
     a window mounting the photodetector; and 
     a package defining a space with the window, the photodetector being disposed in the space, wherein 
     the window includes 
     a window base including a light incident surface, a lower surface opposing the light incident surface, and a side surface coupling the light incident surface and the lower surface, and 
     an electrically conductive body disposed on the lower surface of the window base, 
     the package includes 
     a base portion formed with a recess open toward the lower surface, the base portion including a placement surface disposed along an edge of the recess and opposing the lower surface, a bottom surface opposing the placement surface, and an outer side surface coupled to the bottom surface, 
     a wall portion including an inner wall surface coupled to the placement surface and opposing the side surface, an outer wall surface opposing the inner wall surface and coupled to the outer side surface, and an upper wall surface coupling the inner wall surface and the outer wall surface, the wall portion disposed along the window base when viewed from a direction orthogonal to the light incident surface, 
     a reflection portion disposed on a surface of the recess, being configured to reflect light incident from the window to the photodetector, and 
     an electric conductor disposed on the placement surface, the inner wall surface, the upper wall surface, the outer wall surface, and the outer side surface, 
     the window base is configured to transmit light incident from an outside, 
     the electrically conductive body includes a plurality of first pads opposing the placement surface, and a plurality of connectors electrically connecting the photodetector and the plurality of first pads, and 
     the electric conductor includes a plurality of second pads disposed on the placement surface to oppose corresponding first pads of the plurality of first pads and electrically connected to the corresponding first pads. 
     (Supplementary Note 25) 
     The light detection device according to supplementary note 24, wherein the electric conductor is further disposed on the bottom surface. 
     (Supplementary Note 26) 
     The light detection device according to supplementary note 24 or 25, wherein height from the placement surface to the upper wall surface is larger than height from the placement surface to the light incident surface. 
     (Supplementary Note 27) 
     The light detection device according to any one of supplementary notes 24 to 26, wherein 
     the package has a polygonal shape when viewed from the direction orthogonal to the light incident surface, 
     the number of the outer side surfaces and the outer wall surfaces is plural, respectively, and 
     the electric conductor is not disposed on a corner portion defined by the upper wall surface and the outer wall surfaces adjacent to each other, on a ridge portion defined by the outer wall surfaces adjacent to each other, and on a ridge portion defined by the outer side surfaces adjacent to each other. 
     (Supplementary Note 28) 
     The light detection device according to any one of supplementary notes 24 to 27, wherein the electric conductor is disposed on the upper wall surface such that a ratio of an area of the electric conductor to an area of the upper wall surface is 50% or more. 
     (Supplementary Note 29) 
     The light detection device according to any one of supplementary notes 24 to 28, wherein the electric conductor is disposed on the outer wall surface and the outer side surface such that a ratio of an area of the electric conductor to a sum of an area of the outer wall surface and an area of the outer side surface is 50% or more. 
     (Supplementary Note 30) 
     The light detection device according to any one of supplementary notes 24 to 29, wherein the window includes a dummy pad disposed on the lower surface and mounting the photodetector. 
     (Supplementary Note 31) 
     The light detection device according to any one of supplementary notes 24 to 30, wherein each of the connectors includes a third pad mounting the photodetector, and an electrically conductive line electrically connecting the first pad and the third pad. 
     (Supplementary Note 32) 
     The light detection device according to any one of supplementary notes 24 to 30, wherein 
     one connector of the plurality of connectors includes a third pad mounting the photodetector, and an electrically conductive line electrically connecting the first pad and the third pad, and 
     another connector of the plurality of connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the photodetector and the fourth pad. 
     (Supplementary Note 33) 
     The light detection device according to any one of supplementary notes 24 to 30, wherein each of the connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the photodetector and the fourth pad. 
     (Supplementary Note 34) 
     The light detection device according to any one of supplementary notes 24 to 33, wherein the window base is a silicon substrate. 
     (Supplementary Note 35) 
     The light detection device according to supplementary note 34, wherein the window includes an antireflection film disposed on at least one surface of the light incident surface and the lower surface. 
     An embodiment of the supplementary note 24 is the light detection device including the photodetector, the window  20 , and the package  30 . The light detection device includes, for example, the same configuration as the light-emitting device D 1  except for the photodetector. The photodetector includes a light detection element. Examples of the light detection element include a photodiode element capable of sensing infrared light. Light incident from the outside is reflected on the reflection portion  32 , and the photodetector receives the light reflected from the reflection portion  32 . The photodetector may be connected to the electric conductor  34  having a high heat dissipation effect, and heat generated in the light detection device is effectively dissipated through the electric conductor  34 . 
     For example, in the light detection device including a photodiode, generally, the size of the electric conductor tends to be reduced from the viewpoint of reducing the generation of noise, for example. However, in the light detection device of this supplementary note, the electric conductor is disposed in a region from the placement surface to the upper wall surface to improve the heat dissipation through the electric conductor. 
     This specification also discloses the following supplementary notes. 
     (Supplementary Note 36) 
     A light detection device comprising: 
     a photodetector; 
     a window mounting the photodetector; and 
     a package defining a space with the window, the photodetector being disposed in the space, wherein 
     the window includes 
     a window base including a light incident surface, a lower surface opposing the light incident surface, and a side surface coupling the light incident surface and the lower surface, and 
     an electrically conductive body disposed on the lower surface of the window base, 
     the package includes 
     a base portion formed with a recess open toward the lower surface, the base portion including a placement surface disposed along an edge of the recess and opposing the lower surface, a bottom surface opposing the placement surface, and an outer side surface coupled to the bottom surface, 
     a wall portion including an inner wall surface coupled to the placement surface and opposing the side surface, an outer wall surface opposing the inner wall surface and coupled to the outer side surface, and an upper wall surface coupling the inner wall surface and the outer wall surface, the wall portion disposed along the window base when viewed from a direction orthogonal to the light incident surface, 
     a reflection portion disposed on a surface of the recess, being configured to reflect light incident from the window to the photodetector, and 
     an electric conductor disposed on the placement surface, the inner wall surface, and the upper wall surface, 
     the window base is configured to transmit light incident from an outside, 
     the electrically conductive body includes a plurality of first pads opposing the placement surface, and a plurality of connectors electrically connecting the photodetector and the plurality of first pads, and 
     the electric conductor includes a plurality of second pads disposed on the placement surface to oppose corresponding first pads of the plurality of first pads and electrically connected to the corresponding first pads. 
     (Supplementary Note 37) 
     The light detection device according to supplementary note 36, wherein the electric conductor is further disposed on the bottom surface. 
     (Supplementary Note 38) 
     The light detection device according to supplementary note 36 or 37, wherein height from the placement surface to the upper wall surface is larger than height from the placement surface to the light incident surface. 
     (Supplementary Note 39) 
     The light detection device according to any one of supplementary notes 36 to 38, wherein 
     the package has a polygonal shape when viewed from the direction orthogonal to the light incident surface, 
     the number of the outer side surfaces and the outer wall surfaces is plural, respectively, and 
     the electric conductor is not disposed on a corner portion defined by the upper wall surface and the outer wall surfaces adjacent to each other, on a ridge portion defined by the outer wall surfaces adjacent to each other, and on a ridge portion defined by the outer side surfaces adjacent to each other. 
     (Supplementary Note 40) 
     The light detection device according to any one of supplementary notes 36 to 39, wherein the electric conductor is disposed on the upper wall surface such that a ratio of an area of the electric conductor to an area of the upper wall surface is 50% or more. 
     (Supplementary Note 41) 
     The light detection device according to any one of supplementary notes 36 to 40, wherein the window includes a dummy pad disposed on the lower surface and mounting the photodetector. 
     (Supplementary Note 42) 
     The light detection device according to any one of supplementary notes 36 to 41, wherein each of the connectors includes a third pad mounting the photodetector, and an electrically conductive line electrically connecting the first pad and the third pad. 
     (Supplementary Note 43) 
     The light detection device according to any one of supplementary notes 36 to 41, wherein 
     one connector of the plurality of connectors includes a third pad mounting the photodetector, and an electrically conductive line electrically connecting the first pad and the third pad, and 
     another connector of the plurality of connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the photodetector and the fourth pad. 
     (Supplementary Note 44) 
     The light detection device according to any one of supplementary notes 36 to 41, wherein each of the connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the photodetector and the fourth pad. 
     (Supplementary Note 45) 
     The light detection device according to any one of supplementary notes 36 to 44, wherein the window base is a silicon substrate. 
     (Supplementary Note 46) 
     The light detection device according to supplementary note 45, wherein 
     the window includes an antireflection film disposed on at least one surface of the light incident surface and the lower surface. 
     In the embodiment of supplementary note 36, the electric conductor is disposed on the placement surface, the inner wall surface, and the upper wall surface, but is not disposed on the outer wall surface and the outer side surface. 
     This specification also discloses the following supplementary notes. 
     (Supplementary Note 47) 
     A light detection device comprising: 
     a photodetector; 
     a window mounting the photodetector; and 
     a package defining a space with the window, the photodetector being disposed in the space, wherein 
     the window includes 
     a window base including a light incident surface, a lower surface opposing the light incident surface, and a side surface coupling the light incident surface and the lower surface, and 
     an electrically conductive body disposed on the lower surface of the window base, 
     the package includes 
     a base portion formed with a recess open toward the lower surface, the base portion including a placement surface disposed along an edge of the recess and opposing the lower surface, a bottom surface opposing the placement surface, and an outer side surface coupled to the bottom surface, 
     a wall portion including an inner wall surface coupled to the placement surface and opposing the side surface, an outer wall surface opposing the inner wall surface and coupled to the outer side surface, and an upper wall surface coupling the inner wall surface and the outer wall surface, the wall portion disposed along the window base when viewed from a direction orthogonal to the light incident surface, 
     a reflection portion disposed on a surface of the recess, being configured to reflect light incident from the window to the photodetector, and 
     an electric conductor disposed on the placement surface, the inner wall surface, the upper wall surface, and the outer wall surface, 
     the window base is configured to transmit light incident from an outside, 
     the electrically conductive body includes a plurality of first pads opposing the placement surface, and a plurality of connectors electrically connecting the photodetector and the plurality of first pads, and 
     the electric conductor includes a plurality of second pads disposed on the placement surface to oppose corresponding first pads of the plurality of first pads and electrically connected to the corresponding first pads. 
     (Supplementary Note 48) 
     The light detection device according to supplementary note 47, wherein the electric conductor is further disposed on the bottom surface. 
     (Supplementary Note 49) 
     The light detection device according to supplementary note 47 or 48, wherein height from the placement surface to the upper wall surface is larger than height from the placement surface to the light incident surface. 
     (Supplementary Note 50) 
     The light detection device according to any one of supplementary notes 47 to 49, wherein 
     the package has a polygonal shape when viewed from the direction orthogonal to the light incident surface, 
     the number of the outer side surfaces and the outer wall surfaces is plural, respectively, and 
     the electric conductor is not disposed on a corner portion defined by the upper wall surface and the outer wall surfaces adjacent to each other, on a ridge portion defined by the outer wall surfaces adjacent to each other, and on a ridge portion defined by the outer side surfaces adjacent to each other. 
     (Supplementary Note 51) 
     The light detection device according to any one of supplementary notes 47 to 50, wherein the electric conductor is disposed on the upper wall surface such that a ratio of an area of the electric conductor to an area of the upper wall surface is 50% or more. 
     (Supplementary Note 52) 
     The light detection device according to any one of supplementary notes 47 to 51, wherein the electric conductor is disposed on the outer wall surface such that a ratio of an area of the electric conductor to an area of the outer wall surface is 50% or more. 
     (Supplementary Note 53) 
     The light detection device according to any one of supplementary notes 47 to 52, wherein the window includes a dummy pad disposed on the lower surface and mounting the photodetector. 
     (Supplementary Note 54) 
     The light detection device according to any one of supplementary notes 47 to 53, wherein each of the connectors includes a third pad mounting the photodetector, and an electrically conductive line electrically connecting the first pad and the third pad. 
     (Supplementary Note 55) 
     The light detection device according to any one of supplementary notes 47 to 53, wherein 
     one connector of the plurality of connectors includes a third pad mounting the photodetector, and an electrically conductive line electrically connecting the first pad and the third pad, and 
     another connector of the plurality of connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the photodetector and the fourth pad. 
     (Supplementary Note 56) 
     The light detection device according to any one of supplementary notes 47 to 53, wherein each of the connectors includes a fourth pad electrically connected to the first pad, and a wire electrically connecting the photodetector and the fourth pad. 
     (Supplementary Note 57) 
     The light detection device according to any one of supplementary notes 47 to 56, wherein the window base is a silicon substrate. 
     (Supplementary Note 58) 
     The light detection device according to supplementary note 57, wherein the window includes an antireflection film disposed on at least one surface of the light incident surface and the lower surface. 
     In the embodiment of supplementary note 47, the electric conductor is disposed on the placement surface, the inner wall surface, the upper wall surface, and the outer wall surface, but is not disposed on the outer side surface. 
     REFERENCE SIGNS LIST 
     
         
         
           
               10  LIGHT SOURCE 
               20  WINDOW 
               22  LIGHT EXIT SURFACE 
               23  LOWER SURFACE 
               24  SIDE SURFACE 
               25  FIRST PAD 
               26  THIRD PAD 
               27  ELECTRICALLY CONDUCTIVE LINE 
               28  DUMMY PAD 
               30  PACKAGE 
               31  CORNER PORTION 
               32  REFLECTION PORTION 
               33  RIDGE PORTION 
               34  ELECTRIC CONDUCTOR 
               36  SECOND PAD 
               40  BASE PORTION 
               42  RECESS 
               44  PLACEMENT SURFACE 
               46  BOTTOM SURFACE 
               47  EDGE 
               48  OUTER SIDE SURFACE 
               50  WALL PORTION 
               52  INNER WALL SURFACE 
               54  OUTER WALL SURFACE 
               56  UPPER WALL SURFACE 
               65   p  FOURTH PAD 
             AG 1  BLOCK 
             AR ANTIREFLECTION FILM 
             Ax 1  DIRECTION 
             CT 1  to CT 4  CUTTING PLANNED LINE 
             D 1 , D 2 , D 3  LIGHT-EMITTING DEVICE 
             SC 1  SPACE 
             CN 1  CONNECTOR 
             WD 1  ELECTRICALLY CONDUCTIVE BODY