Patent ID: 12191628

MODES FOR CARRYING OUT THE INVENTION

The following describes an embodiment of the present disclosure in detail with reference to the drawings. The following description is a specific example of the present disclosure, but the present disclosure is not limited to the following modes. In addition, the present disclosure is not limited to the disposition, dimensions, dimensional ratios, or the like of the respective components illustrated in the drawings. It is to be noted that description is given in the following order.1. First Embodiment (Example in which a bonding member for a housing member and a cover is used as an electrical conduction path)1-1. Configuration of Semiconductor Light Emitting Device1-2. Configuration of Light Emitting Apparatus1-3. Workings and Effects2. Second Embodiment (Example in which the metal pattern on the bonded surface of a housing member is separated into a metal pattern for an electrode extraction section and a bonding metal pattern)3. Third Embodiment (Example in which a solder stop band is provided on the border between a metal pattern for an electrode extraction section and a bonding metal pattern)4. Fourth Embodiment (Example in which an electrode extraction section is provided on the upper surface of a cover)5. Fifth Embodiment (Example in which a recessed section is provided on a cover side)6. Sixth Embodiment (Example in which a light emitting element and a mirror are disposed in the same plane)7. Seventh Embodiment (Example in which a metal pattern for electrode extraction and a bonding metal pattern are electrically coupled by using a solder pattern on a cover side)8. Eighth Embodiment (Example in which a ground pattern is provided)9. Ninth Embodiment (Example in which light is emitted in the horizontal direction)10. Tenth Embodiment (Example in which a vertical resonator surface emitting laser is used)11. Modification Examples (Another example of a configuration of a display)12. Application Example (Example of a projection display)

1. First Embodiment

FIG.1is an exploded perspective view of an example of a configuration of a semiconductor light emitting device (semiconductor light emitting device10A) according to a first embodiment of the present disclosure.FIG.2schematically illustrates an example of a planar configuration of the semiconductor light emitting device10A illustrated inFIG.1. The semiconductor light emitting device10A is a packaged surface mount device (surface mount device: SMD). The semiconductor light emitting device10A includes a light emitting element11, a housing member14, and a cover15. The housing member14includes a recessed section14C and the light emitting element11is housed in this recessed section14C. The housing member14and the cover15are bonded with a bonding member16interposed in between. This hermetically seals the light emitting element11. This housing member14corresponds to a specific example of a “first housing member” of the present disclosure and the cover15corresponds to a specific example of a “second housing member” of the present disclosure.

(1-1. Configuration of Semiconductor Light Emitting Device)

In the semiconductor light emitting device10A according to the present embodiment, the light emitting element11is housed in the recessed section14C of the housing member14, for example, along with a submount12and a mirror13. The housing member14is bonded to the cover15with the bonding member16interposed in between and seals the light emitting element11, the submount12, and the mirror13along with the cover15. The housing member14is provided with a wiring structure for electrically coupling the light emitting element11and the outside. The bonding member16is electrically coupled to this wiring structure. Along with the wiring structure, the bonding member16is included in an electrical conduction path that electrically couples the light emitting element11and the outside.

The light emitting element11includes, for example, a semiconductor laser element such as LD (Laser Diode). The light emitting element11includes, for example, a gallium nitride (GaN)-based semiconductor material and emits light in the blue wavelength range. A wavelength conversion member such as a fluorescent material may be disposed in the optical path of the light emitted from the light emitting element11. The light emitting element11may include, for example, a semiconductor material such as a gallium arsenide (GaAs)-based material. One (e.g., anode) of the anode and the cathode of the light emitting element11is coupled to the wiring structure provided in the housing member14described below by wire bonding and extracted, for example, from an electrode extraction section14E2. For example, a wire W is used in the wire bonding. The wire W includes, for example, gold (Au). One (e.g., cathode) of the anode and the cathode of the light emitting element11is extracted, for example, from an electrode extraction section14E1through the wiring structure provided in the housing member14without using the wire W, for example, in a case where the electrically conductive submount12described below is used.

The submount12is for mounting the light emitting element11. The submount12is provided between the light emitting element11and the bottom surface of the recessed section14C of the housing member14. The submount12is, for example, a plate-shaped member. The position of the light emitting element11may be adjusted in accordance with the thickness of the submount12(size in the Z direction inFIG.1). The submount12includes, for example, an insulating material such as aluminum nitride (AlN), silicon (Si), silicon carbide (SiC), diamond, or beryllium oxide (BeO). In a case where the submount12including an insulating material is used, a wire is coupled from a metal pattern (not illustrated) on the submount12to a metal pattern143M1or a metal pattern141M1. This electrically couples, for example the electrode extraction section14E1and the light emitting element11.

The submount12may include, for example, an electrically conductive material such as copper tungsten (Cu—W), copper molybdenum (Cu—Mo), copper diamond, and graphite. The use of the electrically conductive submount12makes it possible to cause one (e.g., cathode) of the electrodes of the light emitting element11to be conducted to the wiring structure inside the housing member14through the submount12. This decreases the wires W in number as compared with a case where the anode and the cathode of the light emitting element11are both coupled, for example, to an electrode extraction section14E by using the wires W. It is thus possible to decrease the semiconductor light emitting device10A in size.

The light emitting element11is eutectically bonded to the submount12, for example, by AuSn (gold-tin) and the submount12is eutectically bonded to the bottom surface of the recessed section14C of the housing member14, for example, by AuSn. The submount12may also be bonded to the bottom surface of the recessed section14C of the housing member14, for example, by silver (Ag) paste, sintered gold (Au), sintered silver (Ag), or the like.

The mirror13is for reflecting the light emitted from the light emitting element11. The light emitted from the light emitting element11is reflected by the mirror13and emitted from the cover15side. The mirror13is provided in the recessed section14C of the housing member14along with the light emitting element11mounted on the submount12. The recessed section14C is provided, for example, with a step inside. The mirror13is disposed at a lower position than that of the light emitting element11.

The mirror13has, for example, an inclined surface. This inclined surface is disposed to be opposed to the light emitting surface of the light emitting element11. The inclined surface of the mirror13is inclined, for example, by 45° from the bottom surface of the housing member14. This allows the light reflected by the inclined surface of the mirror13to be extracted in the direction vertical to the bottom surface of the housing member14. Adjusting the angle of the inclined surface of the mirror13also allows the light extraction direction to be changed. The mirror13includes, for example, glass, synthetic quartz, silicon, sapphire, copper, aluminum, or the like. The inclined surface of the mirror13may be provided, for example, with a reflective film such as a metal film or a dielectric multilayered film. This reflective film has, for example, a reflectance of 90% or more for the light emitted from the light emitting element11. The reflective film preferably has a reflectance of 99% or more.

FIG.3is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.1.FIGS.4A to4Cschematically illustrate cross-sectional configurations of the housing member14taken along an I-I line, an II-II line, and an III-III line illustrated inFIG.2. The housing member14houses the light emitting element11mounted on the submount12and the mirror13and seals the light emitting element11and the mirror13along with the cover15. In other words, the recessed section14C of the housing member14and the cover15form a housing space having airtightness. The recessed section14C has, for example, a rectangular planar shape. The housing member14includes, for example, glass or ceramic. The housing member14includes, for example, a sintered compact such as aluminum nitride (AlN), aluminum oxide (alumina), or silicon carbide (SiC).

The housing member14includes a first layer141and a second layer142. The first layer141is included in the bottom surface of the recessed section14C. The second layer142is included in the side surface of the recessed section14C. The second layer142includes a bonding layer144and an intermediate layer143. The bonding layer144is bonded to the cover. The intermediate layer143is disposed between the first layer141and the bonding layer144. Metal patterns141M,143M, and144M are each formed on the first layer141and the second layer142(specifically, the intermediate layer143and the bonding layer144) and electrically coupled as appropriate. Each of the metal patterns141M,143M, and144M includes, for example, gold (Au) or the like. This first layer141corresponds to a specific example of a “first layer” of the present disclosure and the second layer142corresponds to a specific example of a “second layer” of the present disclosure.

As described above, the first layer141is included in the bottom surface of the recessed section14C. The first layer141is, for example, a plate member having a rectangular planar shape. The first layer141has an upper surface141S1and a lower surface141S2that are opposed to each other. This upper surface141S1is included in a portion of the bottom surface of the recessed section14C. The lower surface141S2is included in a back surface14S2of the housing member14. The upper surface141S1is provided with the metal pattern141M1. The metal pattern141M1is used, for example, to mount the mirror13. The metal pattern141M1is provided to partially correspond to an opening143H, for example, in a plan (XY plane) view. The opening143H is provided in the intermediate layer143described below. Specifically, the metal pattern141M1is provided to be exposed in the opening143H. This allows the mirror13to efficiently dissipate heat. In addition, it is possible to facilitate soldering onto the mirror13.

The lower surface141S2of the first layer141is provided with a metal pattern141M2for mounting on a base plate31described below. This metal pattern141M2also functions as a heat dissipation member and also allows the heat generated by the light emitting element11to be efficiently dissipated to the base plate31. In other words, providing the metal pattern141M2on the back surface14S2of the housing member14makes it possible to electrically and thermally couple the semiconductor light emitting device10A and the base plate31.

As described above, the intermediate layer143is included in a portion of the side surface of the recessed section14C and disposed between the first layer141and the bonding layer144. The intermediate layer143is, for example, a plate member having a rectangular planar shape. The intermediate layer143has an upper surface143S1and a lower surface143S2that are opposed to each other. This upper surface143S1is included in the bottom surface of the recessed section14C along with the upper surface141S1of the first layer141. The intermediate layer143is provided with the opening143H in which the mirror13is disposed. The metal pattern141M1provided on the upper surface of the first layer141is exposed in the opening143H. The mirror13is mounted through the metal pattern141M1.

The upper surface143S1of the intermediate layer143is provided with the metal pattern143M1and a metal pattern143M2that are independent from each other. The metal pattern143M1is used, for example, to mount the submount12. The metal pattern143M1is patterned to overlap at least partially, for example, with at least any one of the metal pattern141M1provided on the first layer141or a metal pattern144M1provided on the bonding layer144described below in a plan view. In addition, the metal pattern143M1is provided to be partially exposed in an opening144H provided in the bonding layer144and mounted with the submount12. This allows the submount12to efficiently dissipate heat. In addition, it is possible to facilitate soldering onto the submount12. The metal pattern143M2is patterned to at least partially overlap with a metal pattern144M2provided on the bonding layer144, for example, in a plan view.

The intermediate layer143is further provided with a via V1that penetrates the intermediate layer143in the Z axis direction. The via V1is provided with the position overlapping with the metal pattern143M1and the metal pattern141M1on the first layer141and couples the metal pattern141M1and the metal pattern143M1. Providing this via V1facilitates electroplating treatment in gold plating treatment described below. In addition, providing the via V1makes it possible to electrically couple, for example, the electrode extraction section14E1and the light emitting element11by coupling a wire from the metal pattern (not illustrated) on the submount12to the metal pattern141M1in a case where an insulating material is used for the submount12.

As described above, the bonding layer144is included in a portion of the side surface of the recessed section14C and bonded to the cover15. The bonding layer144is, for example, a plate member having a rectangular planar shape. The bonding layer144has an upper surface144S1and a lower surface144S2that are opposed to each other. This upper surface144S1is included in a bonded surface14S1of the housing member14to the cover15. The bonding layer144is provided with the opening144H in which the submount12is disposed. Portions of the metal pattern143M1and the metal pattern143M2provided on the upper surface of the intermediate layer143are exposed in the opening144H. The submount12is mounted through the metal pattern143M1. The metal pattern143M2is electrically coupled to one (e.g., anode) of the electrodes of the light emitting element11mounted on the submount12through the wire W. In addition, the opening144H includes the opening143H provided in the intermediate layer143. In other words, the recessed section14C includes the opening143H and the opening144H. This causes the bottom surface of the recessed section14C to have a step.

The upper surface144S1of the bonding layer144is provided with the metal pattern144M1that surrounds the opening144H along the edge and partially protrudes to the outside of the edge. This portion (metal pattern14MC) along the edge is used to bond the cover15(specifically, a solder pattern151M described below). The protruding portion (metal pattern14ME) is exposed from the cover15. The protruding portion (metal pattern14ME) is included in the electrode extraction section14E1that electrically couples the light emitting element11and the outside. In other words, the metal pattern144M1includes the metal pattern14MC and the metal pattern14ME. The upper surface144S1of the bonding layer144is further provided with the metal pattern144M2independent from the metal pattern144M1, for example, next to the protruding portion (metal pattern14ME) of the metal pattern144M1. The metal pattern144M2is exposed from the cover15along with the metal pattern14ME. The metal pattern144M2is included in the electrode extraction section14E2that electrically couples the light emitting element11and the outside. The electrode extraction section14E1and the electrode extraction section14E2are portions where the electrodes are drawn out from the anode and the cathode of the light emitting element11.

The bonding layer144is further provided, for example, with three vias V2and one via V3that penetrate the bonding layer144in the Z axis direction. The three vias V2are provided at the positions overlapping with the metal pattern144M1and the metal pattern143M1on the intermediate layer143. Specifically, the two vias V2of the three vias V2are provided immediately below the metal pattern14MC and the one via V2is provided immediately below the metal pattern14ME. In other words, the metal pattern14MC is coupled to the metal pattern143M1by the two vias V2and the metal pattern14ME is coupled to the metal pattern143M1by the one via V2. The one via V3is provided with the position overlapping with the metal pattern144M2and the metal pattern143M2on the intermediate layer143and couples the metal pattern143M2and the metal pattern144M2.

As described above, the anode and the cathode of the light emitting element11are drawn out from the electrode extraction section14E1and the electrode extraction section14E2exposed from the cover15through the metal patterns141M,143M, and144M provided on the first layer141and the second layer142and the vias V1, V2, and V3. Specifically, the cathode of the light emitting element11is drawn out from the electrode extraction section14E1, for example, through the metal pattern141M1, the via V1, the metal pattern143M1, and the one via V2and the metal pattern141M1, the via V1, the metal pattern143M1, the two vias V2, and the metal pattern14MC. The anode of the light emitting element11is drawn out from the electrode extraction section14E2, for example, through the wire W, the metal pattern143M2, and the via V3.

The light emitted from the light emitting element11is extracted from the cover15. The cover15is, for example, a plate member having a rectangular planar shape. The cover15has an upper surface15S1and a lower surface15S2that are opposed to each other. The cover15covers at least the recessed section14C of the housing member14. The lower surface15S2of the cover15is coated with the solder pattern151M with an adhesive layer interposed in between. The adhesive layer includes chromium (Cr), titanium (Ti), gold (Au), or the like. This solder pattern151M has substantially the same planar shape, for example, as that of the bonding metal pattern14MC portion formed on the bonded surface14S1of the housing member14. Specifically, the solder pattern151M has the shape of a frame that surrounds the recessed section14C. The width of the solder pattern151M is substantially the same as that of a bonding metal pattern144MC formed on the upper surface of the housing member14or the solder pattern151M has a width less than or equal to that of the bonding metal pattern144MC. The solder pattern151M is formed by using, for example, SnAgCu (tin-silver-copper)-based solder. AuSn (gold-tin)-based solder, Sn (tin)-based solder, In (indium)-based solder, or the like may be used for the solder pattern151M. The use of such soldering or the like hermetically seals (hermetic seal) the light emitting element11or the like between the housing member14and the cover15. The cover15includes a material that has light transmissivity at the portion covering at least the recessed section14C. Specifically, the cover15includes, for example, glass or the like.

The bonding member16is for bonding the housing member14and the cover15. The bonding member16includes, for example, the metal pattern14MC and the solder pattern151M. The metal pattern14MC is provided on the bonded surface14S1of the housing member14. The solder pattern151M is provided on the lower surface15S2of the cover15. The metal pattern14MC is a portion of the metal pattern144M1. The metal pattern144M1includes the metal pattern14ME included in the electrode extraction section14E1in addition to the metal pattern14MC. In other words, the metal pattern14MC and the metal pattern14ME are formed in the same metal pattern (metal pattern144M1) and electrically coupled to each other. In addition, the metal pattern14MC is coupled to the metal pattern143M1through the two vias V2. The metal pattern143M1is electrically coupled, for example, to the cathode of the light emitting element11, for example, through the submount12. In other words, the metal pattern14MC is included, for example, in a portion of the electrical conduction path between the cathode of the light emitting element11and the electrode extraction section14E1. This increases the cross-sectional area of the electrical conduction path that electrically couples the light emitting element11and the outside (e.g., electrode extraction section14E1) and reduces the internal resistance.

The semiconductor light emitting device10A is manufactured, for example, as follows. Specifically, the metal pattern141M and the metal pattern141M2are formed on the upper surface141S1and the lower surface141S2of the first layer141. Next, the second layer142is formed. First, the opening143H included in the recessed section14C and a through hole (not illustrated) for the via V1are formed in the intermediate layer143. Subsequently, the via V1is formed by filling the through hole, for example, with tungsten paste, copper (Cu), or silver (Ag) and the metal pattern143M1and the metal pattern143M2are then formed on the upper surface143S1of the intermediate layer143. Next, the opening144H included in the recessed section14C and a through hole (not illustrated) for the vias V2and V3are formed in the bonding layer144. Subsequently, the vias V2and V3are formed by filling the through hole, for example, with tungsten paste, copper (Cu), or silver (Ag) and the metal pattern144M1and the metal pattern144M2are then formed on the upper surface144S1of the bonding layer144. After that, sintering is performed, gold plating treatment is performed on the exposed portion, and singulation is then performed to form the housing member14. Next, after the submount12, the light emitting element11, and the mirror13are disposed in the recessed section14C of the housing member14, for example, the anode of the light emitting element11and the metal pattern143M2are coupled by wire bonding. For example, a gold wire (wire W) is used in the wire bonding. In addition, in a case where an insulating material is used for the submount12, a wire is coupled from a metal pattern (not illustrated) on the submount12to a metal pattern143M1or a metal pattern141M1. This electrically couples, for example the electrode extraction section14E1and the light emitting element11. Finally, the cover15is bonded to the housing member14. This hermetically seals the light emitting element11to complete the semiconductor light emitting device10A.

In the manufacturing step of the semiconductor light emitting device10A described above, the melting temperature of bonding agents is of importance in the three steps of mounting the mirror13, mounting the light emitting element11and the submount12, and bonding the housing member14and the cover15. For example, the mirror13is preferably bonded by using AuSn solder or sintering Ag paste as a bonding agent. The light emitting element11and the submount12are preferably bonded by using AuSn solder as a bonding agent. The housing member and the cover15are preferably bonded by using SnAgCu solder as a bonding agent. The combinations described above prevent the bonding agents from remelting in the respective steps, making it possible to secure the mounting accuracy. It is to be noted that, in a case where AuSn solder is used to mount the mirror13, the AuSn solder that melts in mounting the mirror13may take in, for example, the gold plate applied to the metal pattern exposed in the recessed section14C of the housing member14and increase the melting temperature. It is possible to prevent this remelting by appropriately setting the melting temperature of the AuSn solder to mount the light emitting element11and the submount12.

In the semiconductor light emitting device10A, light is extracted, for example, as follows. The light (e.g., light in the blue wavelength range) emitted from the light emitting element11is reflected by the mirror13, transmitted by the cover15, and extracted from the semiconductor light emitting device10A.

(1-2. Configuration of Light Emitting Apparatus)

FIG.5illustrates a schematic configuration of the side surface of a light emitting apparatus (light emitting apparatus1) including the semiconductor light emitting device10A illustrated inFIG.1.FIG.6is an exploded perspective view of the light emitting apparatus1illustrated inFIG.5. The light emitting apparatus1includes the semiconductor light emitting device10A, the base plate31, a lens holding member32, and an array lens33. The array lens33includes a lens331corresponding to each of the semiconductor light emitting devices10A.

The base plate31is a member for placing the semiconductor light emitting device10A. The base plate31is, for example, a flat member. The base plate31has a front surface31A and a back surface31B that are opposed to each other. The front surface31A is provided with the plurality of semiconductor light emitting devices10A and the back surface31B is thermally coupled, for example, to a heat sink or the like (not illustrated).

The base plate31includes, for example, a ceramic material, a metal material, or the like. The base plate31including a metal material is able to increase heat dissipation. Examples of the metal material include iron (Fe), iron alloy, copper (Cu), aluminum (Al), copper alloy, and the like. Examples of the copper alloy include copper tungsten (CuW) and the like. Examples of the ceramic material include aluminum nitride (AlN) and the like. The base plate31may be provided with a coolant channel.

The base plate31may be provided with a recessed section for placing the semiconductor light emitting device10A. Providing the semiconductor light emitting device10A in the recessed section of the base plate31allows the semiconductor light emitting device10A to be protected.

The plurality of semiconductor light emitting devices10A is placed on the front surface31A of the base plate31. The plurality of semiconductor light emitting devices10A is disposed, for example, in a matrix on the front surface31A of the base plate31(in the X direction and the Y direction ofFIG.6). For example, a portion of the semiconductor light emitting devices10A disposed in a matrix may be missing. This missing portion of the semiconductor light emitting devices10A is, for example, for the purpose of removing a defective product or the purpose of reducing a portion of the power density in the surface. The semiconductor light emitting devices10A may be disposed, for example, in another form such as a substantially hexagonal shape or a houndstooth shape.

The intervals between the plurality of semiconductor light emitting devices10A disposed in a matrix on the front surface31A of the base plate31are smaller, for example, in the θ-parallel direction than in the θ-perpendicular direction. The FFP (Far Field Pattern) half-value width in the θ-parallel direction is narrower than the FFP half-value width in the θ-perpendicular direction. It is thus possible to decrease the intervals between the semiconductor light emitting devices10A in the θ-parallel direction. This makes it possible to increase the light density. The plurality of semiconductor light emitting devices10A may be disposed in a line.

The lens holding member32provided between the base plate31and the array lens33has, for example, the shape of a frame that surrounds the plurality of semiconductor light emitting devices10A placed on the front surface31A of the base plate31(FIG.6). In other words, the plurality of semiconductor light emitting devices10A is provided inside the frame-shaped lens holding member32. The planar shape of the lens holding member32is, for example, a quadrangular shape. This lens holding member32includes, for example, a holding section321having a quadrangular frame shape and an expanded section322expanded on the inside and the outside of the holding section321. The expanded section322is provided, for example, on two opposed sides of the quadrangular holding section321. The lens holding member32does not have to be provided over the entire circumference of the base plate31, but may be provided, for example, on three sides of the quadrangular base plate31. Alternatively, the lens holding member32may be provided on two opposed sides of the quadrangular base plate31.

The lens holding member32is fixed to the base plate31by using, for example, a screw or the like (not illustrated). A method of fixing the lens holding member32to the base plate31may be any method. For example, adhesive may be used to fix the lens holding member32to the base plate31. The adhesive includes, for example, a resin material. Alternatively, the lens holding member32and the base plate31may be collectively molded by using an insert molding process or the like.

The thickness of the holding section321(size in the Z direction inFIG.6) is, for example, greater than the thickness of the expanded section322. This holding section321is in contact with the base plate31and the array lens33. The distance between each of the semiconductor light emitting devices10A and the lens331is thus adjusted in accordance with the thickness of the holding section321. The thickness of the holding section321is preferably large enough to maintain spaces between the cover15and the array lens33and between the base plate31and the array lens33. The spaces are large enough to allow gas to flow. The size of a space that is large enough to allow gas to flow is, for example, about 0.01 mm. This is a machining tolerance. Alternatively, the size of a space that is large enough to allow gas to flow is about 0.5 mm. This is a tolerance in resin molding. In a case where the cover15and the array lens33are too close to each other, a desorbed matter caused by adhesive or the like stays in between. In a case where this desorbed matter reacts with light and is adsorbed on the cover15or the array lens33, the optical characteristics are decreased. Providing a space that is large enough to allow gas to flow between the cover15and the array lens33makes it possible to suppress such a decrease in the optical characteristics. The holding section321has a thickness of about 1 mm to 30 mm, for example. It is sufficient if the thickness of the holding section321is adjusted, for example, in accordance with the focal distance of the lens331, the optical path length in the semiconductor light emitting device10A, and the like. The holding section321includes, for example, a resin material.

The expanded section322is provided, for example, with a terminal section322E. This terminal section322E is for electrically coupling the semiconductor light emitting device10A (light emitting element11) to the outside, for example, through a wiring line WA. The plurality of terminal sections322E is provided from the inside to the outside of the expanded section322. The terminal section322E includes, for example, an electrically conductive metal material such as aluminum (Al). The portion of the expanded section322other than the terminal section322E includes, for example, the same resin material as that of the holding section321. The expanded section322and the holding section321may include different resin materials.

The holding section321and the expanded section322may be individually fixed to the base plate31. In addition, in a case of the holding section321and the expanded section322, the holding section321may be fixed to the expanded section322. For example, the holding section321includes resin or metal. The expanded section322and the terminal section322E each include PCB (Printed Circuit Board). This allows the holding section321to adhere to the base plate31or the expanded section322by using UV adhesive or solder. In addition, the array lens33and the holding section321may be integrally molded by using an insert molding method. The lens holding member32may include a metal material such as aluminum (Al), SUS (Steel Use Stainless), iron (Fe), and copper (Cu). Alternatively, the lens holding member32may include a ceramic material or the like. The shape of the lens holding member32may be formed by machining such as cutting or formed by die casting, sintering, or the like. The lens holding member32including the terminal section322E preferably includes, for example, one component that is integrated by integral molding. This makes it possible to suppress the cost.

The array lens33is opposed to the base plate31with the plurality of semiconductor light emitting devices10A interposed in between. This array lens33includes, for example, an array section33A in the middle portion and a frame section33F surrounding this array section33A. In the array section33A, the plurality of lenses331is provided at positions opposed to the respective semiconductor light emitting devices10A. Each of the lenses331is disposed, for example, at a position overlapping with the light emitting element11and the mirror13in a plan view. The lens331includes, for example, a convex lens. The lens331may include a plano-convex lens, a biconvex lens, a meniscus lens, and the like. The light transmitted by the cover15of each of the semiconductor light emitting devices10A is collimated by passing through the lens331. The array lens33may have configurations that are different between the lower surface (e.g., the surface opposed to the base plate31) side and the upper surface side. For example, one of the surface sides of the array lens33may have a FAC (Fast Axis Collimator) function and the other surface side may have a SAC (Slow Axis Collimator) function. The array lens33then has, for example, lenticular lenses disposed in the direction in which the lenticular lenses are orthogonal to each other. The array lens33includes, for example, one lens having a biconvex shape or two plano-convex lenses integrally bonded together on the flat surfaces. Alternatively, the array lens33includes two plano-convex lenses that have the flat surface sides aligned to point to the semiconductor light emitting device10A side and are held and integrated by the frame section33F of the array lens33.

The frame section33F around the array section33A has, for example, a quadrangular planar shape. This frame section33F is fixed to the holding section321of the lens holding member32, for example, with adhesive or the like (not illustrated). It is possible to use a photocurable resin such as a UV (Ultra Violet) curable resin or the like as this adhesive. The shrinkage of the resin by photocuring facilitates the array lens33and the lens holding member32to have a positional deviation in between. It is thus preferable to use, for example, a resin material having a curing shrinkage amount of about several % or less. It is more preferable to use a resin material having a curing shrinkage amount of 1% or less. The array lens33may be fixed to the lens holding member32, for example, by a screw or the like. Alternatively, the array lens33and the lens holding member32may be collectively molded by an insert molding process or the like. As described above, the spaces that are large enough to allow gas to flow are provided between the array section33A and the base plate31and between the array section33A and the semiconductor light emitting device10A. The array lens33includes, for example, borosilicate glass or the like.

FIG.7illustrates the semiconductor light emitting device10A illustrated inFIG.1along with the terminal section322E of the lens holding member32. The electrode extraction section14E1and the electrode extraction section14E2provided on the upper surface of each of the plurality of semiconductor light emitting devices10A are coupled to each other, for example, through a wire (wiring line WA). The electrode extraction section14E2of the semiconductor light emitting device10A disposed at the position that is the closest to the terminal section322E of the lens holding member32is coupled to the terminal section322E through the wiring line WA. This makes it possible to couple the outside and the light emitting element11of the semiconductor light emitting device10A. It is to be noted thatFIG.7omits the cover15.

In addition, the metal patterns141M2provided on the back surfaces (the back surfaces14S2of the housing members14) of the adjacent semiconductor light emitting devices10A may be continuous, for example, with silver paste interposed in between. This thermally couples the metal patterns141M2of the adjacent semiconductor light emitting devices10A and widens the heat dissipating path.

In the light emitting apparatus1, light is extracted, for example, as follows. The light extracted from each of the semiconductor light emitting devices10A placed on the base plate31passes, for example, through the lens331at the position corresponding to the semiconductor light emitting device10A to be collimated light. The pieces of light passing through the respective lenses331thus travel in parallel to each other and are extracted from the light emitting apparatus1.

(1-3. Workings and Effects)

In the semiconductor light emitting device10A, the bonding member16(e.g., metal pattern14MC) that bonds the housing member14and the cover15is used as an electrical conduction path that electrically couples an electrode of the light emitting element11and the electrode extraction section14E. This increases the cross-sectional area of a wiring line that electrically couples the light emitting element11and the outside, making it possible to reduce the internal resistance. The following describes these workings and effects.

Driving a light emitting element including a semiconductor laser element causes the siloxane in the atmosphere to react with light near a light emitting point and a reactant tends to be deposited on an end surface of the light emitting element. This reactant causes a change in the reflectance of the end surface. This may cause a decrease in the optical characteristics and destroy the light emitting element. Especially a blue semiconductor laser element that emits, for example, a short wavelength of 500 nm or less tends to have a defect caused by this siloxane in the atmosphere. Hermetically sealing the semiconductor laser element or the like therefore makes it possible to suppress the occurrence of this defect caused by the siloxane in the atmosphere.

Incidentally, a member included in the main body of an SMD package that is used to hermetically seal a semiconductor laser element includes glass or ceramic. A metalized pattern for electrically coupling the anode and the cathode of the semiconductor laser element and an external electrode is formed on the main body of the package. It is, however, difficult because of the restriction of the manufacturing method to embed and fire a lead terminal or form a metalized pattern having, for example, a thickness of 1 mm or less or about several hundreds of μm. This increases the electrical resistance (internal resistance) and increases Joule heating and loss, causing a decrease in the power efficiency and a decrease in the performance of the semiconductor laser element.

In contrast, in the present embodiment, in the semiconductor light emitting device10A, the wiring structure provided in the housing member14and the metal pattern14MC provided on the bonded surface14S1of the housing member14are electrically coupled and used as an electrical conduction path that electrically couples an electrode of the light emitting element11and the electrode extraction section14E.

For example, in the semiconductor light emitting device10A, the metal pattern144M1is provided on the bonded surface14S1(specifically, the upper surface144S1of the bonding layer144) of the housing member14. The metal pattern144M1includes the metal pattern14MC and the metal pattern14ME. The metal pattern14MC is used to bond the cover15. The metal pattern14ME is included in the electrode extraction section14E1. Further, this metal pattern144M1and the wiring structure (e.g., metal pattern143M1) in the housing member14are electrically coupled through the via V2. This allows the metal pattern14MC to be used as a conduction path between the light emitting element11and the outside. The metal pattern14MC is used to bond the cover15. Specifically, for example, the cathode of the light emitting element11and an external electrode (e.g., electrode extraction section14E1) have two conduction paths in between: a conduction path between the metal pattern143M1and the metal pattern14ME included in the electrode extraction section14E1through the via V2; and a conduction path between the metal pattern143M1and the metal pattern14MC through the two vias V2. This reduces the electrical resistance on the cathode side.

As described above, in the present embodiment, the bonding member16that bonds the housing member14and the cover15and the wiring structure formed in the housing member14are electrically coupled to be used as an electrical conduction path. This increases the cross-sectional area of a wiring line that electrically couples the light emitting element11and the outside. This allows the internal resistance to be reduced.

In addition, in the present embodiment, the electrode extraction section14E is provided on the bonded surface14S1of the housing member14. This makes it possible to thermally couple the metal patterns141M2of the adjacent semiconductor light emitting devices10A, for example, by making the metal patterns141M2provided on the back surfaces (the back surfaces14S2of the housing members14) of the adjacent semiconductor light emitting devices10A continuous, for example, with silver paste interposed in between. This widens the heat dissipating path on the back surface of the semiconductor light emitting device10A and makes it possible to increase the heat dissipation characteristics.

The following describes second to tenth embodiments, modification examples, and an application example. The following description, however, denotes the same components as those of the first embodiment described above by the same sings and descriptions thereof are omitted as appropriate.

2. Second Embodiment

FIG.8schematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10B) according to a second embodiment of the present disclosure.FIG.9is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.8. The semiconductor light emitting device10B according to the present embodiment is different from that of the first embodiment described above in that the metal pattern14MC provided on the bonded surface14S1of the housing member14and the metal pattern14ME are separately formed.

It is to be noted that the metal pattern143M1on the intermediate layer143is formed to surround the opening143H in the present embodiment. This electrically couples the metal pattern143M1and a metal pattern141M1A included in the metal pattern14MC through the four vias V2. The metal pattern143M1and the metal pattern14ME are electrically coupled through the one via V2. This electrically couples the metal pattern14MC and the metal pattern14ME through the via V2and the metal pattern143M1.

In this way, the metal pattern14MC and the metal pattern14ME are independently formed. This attains an effect of making it possible to prevent the solder pattern151M provided on the cover15from flowing to the electrode extraction section14E1in addition to the effects in the first embodiment described above.

3. Third Embodiment

FIG.10schematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10C) according to a third embodiment of the present disclosure.FIG.11is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.10. The semiconductor light emitting device10C according to the present embodiment is different from that of the first embodiment described above in that a solder stop band17is formed on the border between the metal pattern14MC that is used as the bonding member16of the metal pattern144M1provided on the bonded surface14S1of the housing member14and the metal pattern14ME that is used as the electrode extraction section14E1. The solder stop band17is, for example, a film of a dielectric material that coats the surface of the metal pattern144M1. Examples of the dielectric material includes aluminum nitride (AlN), aluminum oxide (Al2O3), silicon oxide (SiO2), silicon nitride (SiN), and the like.

In this way, the solder stop band17is provided on the border between the metal pattern14MC and the metal pattern14ME. This attains an effect of making it possible to prevent the solder pattern151M provided on the cover15from flowing to the electrode extraction section14E1in addition to the effects in the first embodiment described above.

4. Fourth Embodiment

FIG.12Aschematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10D) according to a fourth embodiment of the present disclosure.FIG.12Bis a plane schematic diagram of the cover15illustrated inFIG.12Aas viewed from the upper surface15S1side.FIG.12Cschematically illustrates a cross-sectional configuration taken along an IV-IV line illustrated inFIG.12A. The semiconductor light emitting device10D according to the present embodiment is different from that of the first embodiment described above in that the electrode extraction sections14E1and14E2provided on the surface of the housing member14in the first embodiment described above are provided on the upper surface15S1of the cover15.

The upper surface15S1of the cover15is provided with a metal pattern151M2included in an electrode extraction section15E. The respective metal patterns151M2are independently provided at three of the four corners of the cover15having, for example, a rectangular planar shape. These three metal patterns151M2each have, for example, a rectangular shape. Two of the three metal patterns151M2are, for example, electrode extraction sections15E1for cathodes. One of the three metal patterns151M2is, for example, an electrode extraction section15E2for an anode.

The lower surface15S2of the cover15is provided with a solder pattern151M1A and a solder pattern151M1B. The solder pattern151M1A has substantially the same planar shape as that of the bonding metal pattern14MC portion formed on the bonded surface14S1of the housing member14. The solder pattern151M1B is provided inside the solder pattern151M1A and has, for example, a circular shape. The solder pattern151M1B is provided at the position corresponding, for example, to the electrode extraction section15E2for an anode. The electrode extraction section15E2for an anode is provided on the upper surface15S1of the cover15.

The cover15is further provided with two vias V4and one via V5that penetrate the cover15in the Z axis direction. The two vias V4couple, for example, the electrode extraction section15E1for a cathode and the solder pattern151M1A. The one vias V5couples, for example, the electrode extraction section15E2for an anode and the solder pattern151M1B.

FIG.13is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.12A. In the present embodiment, the metal pattern144M2is provided inside the metal pattern144M1that surrounds the opening144H along the edge. The metal patterns141M1,143M1, and143M2and the vias V1, V2, and V3provided to the first layer141and the intermediate layer143are each patterned to correspond to the metal pattern144M1and the metal pattern144M2.

This draws out, for example, the cathode of the light emitting element11from the electrode extraction section15E1, for example, through the metal pattern141M1, the via V1, the metal pattern143M1, the two vias V2, the metal pattern144M1, the solder pattern151M1A, and the via V4. For example, the anode of the light emitting element11is drawn out from the electrode extraction section15E2, for example, through the wire W, the metal pattern143M2, the via V3, the metal pattern144M2, the solder pattern151M1B, and the via V5. In addition, in a case where an insulating material is used for the submount12, a wire is coupled from a metal pattern (not illustrated) on the submount12to the metal pattern143M1or the metal pattern141M1. This electrically couples, for example the electrode extraction section15E1and the light emitting element11.

In this way, providing the electrode extraction section15E on the upper surface15S1of the cover15shortens the conduction path between the light emitting element11and the electrode extraction section15E as compared with the first embodiment described above, making it possible to further reduce the internal resistance.

In addition, in the present embodiment, the two electrode extraction sections15E1and one electrode extraction section E2are disposed in the shape of a letter L. This makes it possible to form a horizontal or longitudinal array, for example, in a case where the plurality of semiconductor light emitting devices10D is coupled in series in the light emitting apparatus1. This increases the degree of layout freedom.

Further, in the present embodiment, the upper surface15S1of the cover15is provided with the electrode extraction section15E. This allows for miniaturization as compared with the first embodiment described above. For example, it is thus possible to suppress the cost of the light emitting apparatus1. In addition, it is possible to place the semiconductor light emitting devices10D more closely in the light emitting apparatus1. Further, as the semiconductor light emitting device10D is decreased in size, the housing member14and the cover15have a smaller bonding region. This makes it possible to suppress the occurrence of a short circuit and a crack in the housing member14or the like due to stress concentrating on the bonding region.

5. Fifth Embodiment

FIG.14Aschematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10E) according to a fifth embodiment of the present disclosure.FIG.14Bschematically illustrates a cross-sectional configuration of the cover15taken along a V-V line illustrated inFIG.14A.FIG.15is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.14A.FIG.16schematically illustrates an example of the planar shape of a metal pattern142M1provided on an upper surface142S1of the second layer142illustrated inFIG.15. The semiconductor light emitting device10E according to the present embodiment is different from that of the first embodiment described above in that there is provided a recessed section15C on the lower surface15S2side of the cover15and the housing member14includes the first layer141and the second layer142. The recessed section15C houses the light emitting element11and the like.

In the present embodiment, the upper surface141S1of the first layer141is provided with the two metal patterns141M1A and141M1B that are independent from each other. The second layer142is provided with an opening142H in which the mirror13is disposed. The upper surface142S1of the second layer142is provided with the metal pattern142M1having, for example, the planar shape illustrated inFIG.16. The metal pattern142M1includes a metal pattern14MM on which the submount12is mounted in addition to the metal pattern14MC that is used for bonding and the metal pattern14ME included in the electrode extraction section14E1. The metal pattern14MM is provided inside the metal pattern14MC along the edge. There are provided openings14MH1and14MH2on both of the respective sides of the metal pattern14MM. The opening14MH1is provided, for example, to include the opening142H. The upper surface142S1of the second layer142is provided with a metal pattern142M2A next to the metal pattern14ME and a metal pattern142M2B inside the opening14MH2as a metal pattern142M2. Solder stop bands17A,17B, and17C are each formed on the border between the metal pattern14MC and the metal pattern14ME and the border between the metal pattern14MC and the metal pattern14MM. The second layer142is further provided with one via V6and two vias V7that penetrate the second layer142in the Z axis direction. The one via V6couples the metal pattern141M1A and the metal pattern14MC of the metal pattern142M1. The two respective vias V7couple the metal pattern141M1B and the metal pattern142M2A and the metal pattern142M2B.

In this way, providing the recessed section15C on the cover15side makes it possible to achieve a decrease in thickness in addition to the effects of the first embodiment described above.

6. Sixth Embodiment

FIG.17schematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10F) according to a sixth embodiment of the present disclosure.FIG.18is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.17.FIG.19schematically illustrates an example of the planar shape of the metal pattern142M1illustrated inFIG.18. The semiconductor light emitting device10F according to the present embodiment is different from that of the fifth embodiment described above in that the submount12on which the light emitting element11is mounted and the mirror13are mounted in the same plane (the upper surface142S1of the second layer142).

In the present embodiment, the upper surface141S1of the first layer141is provided with the metal pattern141M1B. The upper surface142S1of the second layer142is provided with the metal pattern142M1having, for example, the planar shape illustrated inFIG.19. The metal pattern142M1includes a metal pattern14MM1on which the submount12is mounted and a metal pattern14MM2on which the mirror13is mounted in addition to the metal pattern14MC that is used for bonding and the metal pattern14ME included in the electrode extraction section14E1. The metal pattern14MM1and the metal pattern14MM2are provided inside the metal pattern14MC along the edge. There is provided an opening14MH3between the metal pattern14MM1and the metal pattern14MM2. In addition, the opening14MH2is provided inside the metal pattern14MC along the edge as in the fifth embodiment described above. The upper surface142S1of the second layer142is provided with the metal pattern142M2A next to the metal pattern14ME and the metal pattern142M2B inside the opening14MH2as the metal pattern142M2.

The solder stop bands17A,17B, and17C are each formed on the border between the metal pattern14MC and the metal pattern14ME and the borders between the metal pattern14MC and the metal pattern14MM1and the metal pattern14MM2. The metal pattern141M1B is coupled to the respective metal patterns142M2A and142M2B through the two vias V7.

In this way, the bottom surface of the recessed section14C may be a flat surface and the mirror13and the submount12on which the light emitting element11is mounted may be disposed in the same plane. Mounting the submount12and the mirror13on the same metal pattern (metal pattern142M1) makes it possible to prevent a stacking deviation in metal patterns serving as the respective mounting surfaces as compared with the first embodiment, the fifth embodiment, and the like described above. This makes it possible to increase the mounting accuracy in addition the effects of the first embodiment and the fifth embodiment described above.

7. Seventh Embodiment

FIG.20schematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10G) according to a seventh embodiment of the present disclosure. The semiconductor light emitting device10G according to the present embodiment is different from that of the second embodiment described above in that the metal pattern14MC provided on the bonded surface14S1of the housing member14and the metal pattern14ME are separately formed and the metal pattern14MC and the metal pattern14ME are electrically coupled by the solder pattern151M.

In this way, the metal pattern14MC and the metal pattern14ME may be coupled by using the bonding member16(solder pattern151M) provided on the cover15side.

8. Eighth Embodiment

FIG.21schematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10H) according to an eighth embodiment of the present disclosure.FIG.22is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.21. The semiconductor light emitting device10H according to the present embodiment is different from that of the first embodiment described above in that the metal pattern14MC provided on the bonded surface14S1of the housing member14and the metal pattern included in the electrode extraction section14E1and the electrode extraction section14E2are separated formed on the bonded surface14S1of the housing member14and a metal pattern144M3included in the metal pattern14MC is used as a ground (GND) pattern.

In the present embodiment, the entire upper surface141S1of the first layer141is provided with the metal pattern141M1. The upper surface143S1of the intermediate layer143is provided with the metal patterns143M1and143M2similar to those of the first embodiment described above. In addition, the intermediate layer143is provided with two through holes143Hv in which vias V8are formed. The vias V8electrically couple the metal pattern141M1provided on the first layer141and the metal pattern144M3provided on the upper surface144S1of the bonding layer144. The upper surface144S1of the bonding layer144is independently provided with the metal patterns144M1and144M2included in the electrode extraction sections14E1and14E2and the metal pattern144M3that is used as the GND pattern. The metal pattern144M3is provided to surround the opening144H along the edge. The opening144H is provided in the bonding layer144. The metal pattern144M3is included in the metal pattern14MC for bonding the cover15(specifically, the solder pattern151M). In addition, a portion of the metal pattern144M3is drawn out between the metal pattern144M1and the metal pattern144M2. The portion of the metal pattern144M3is coupled, for example, to an external electrode (GND electrode) (metal pattern14MG). The solder stop band17is formed on the border between the metal pattern14MC and the metal pattern14MG. The metal pattern143M1and the metal pattern144M1are electrically coupled through the via V2and the metal pattern143M2and the metal pattern144M2are electrically coupled through the via V3. The metal pattern144M3is electrically coupled to the metal pattern141M1by the via V8that penetrates the intermediate layer143and the bonding layer144as described above.

In this way, the recessed section14C that houses the light emitting element11may be surrounded and the metal pattern14MC that is used to bond the cover15may be used as the GND pattern. This attains an effect of making it possible to reduce EMI, for example, in a case where the light emitting element11is driven at the high frequency in addition to the effects of the first embodiment described above. In addition, it is also possible to place a high-frequency device that is sensitive to noise.

9. Ninth Embodiment

FIG.23schematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10I) according to a ninth embodiment of the present disclosure.FIG.24is an exploded perspective view of an example of a configuration of the housing member14illustrated inFIG.23.FIGS.25A to25Cschematically illustrate cross-sectional configurations of the housing member14taken along a VI-VI line, a VII-VII line, and a VIII-VIII line illustrated inFIG.23. The semiconductor light emitting device10I according to the present embodiment is different from that of the first embodiment described above in that the light of the light emitting element11is extracted in the horizontal direction.

The housing member14according to the present embodiment is provided with a cover18on the side surface with a bonding member19interposed in between. The cover18has light transmissivity. The light emitted from the light emitting element11placed in the recessed section14C of the housing member14is extracted through this cover18. The cover15that is bonded to the bonded surface14S1of the housing member14does not therefore necessarily have to have light transmissivity. For example, it is possible to use a metal plate. This allows the main body of the cover15to be used as an electrical conduction path.

In addition, in the present embodiment, the second layer142has a three-layer structure in which two intermediate layers (the intermediate layer143and an intermediate layer145) and the bonding layer144are stacked in this order. The intermediate layer143is provided with a cutout143X having the shape of a letter U as the planar shape. The upper surface143S1is provided, for example, with the metal patterns143M1and143M2similar to those of the first embodiment described above. The intermediate layer143is further provided with the via V1that penetrates the intermediate layer143in the Z axis direction. The metal pattern143M1and the metal pattern141M1of the first layer141are electrically coupled. The intermediate layer145is provided with a cutout145X having the shape of a letter U as the planar shape as with the intermediate layer143. The cutout145X of the intermediate layer145is deeper than the cutout143X of the intermediate layer143. For example, the side surface of the cutout145X forms the same side surface as that of a portion of the opening144H provided in the bonding layer144. In the present embodiment, the submount12is mounted on the metal pattern143M1in this cutout145X. In addition, the intermediate layer145is provided with through holes145H1,145H2, and145H3through which the two vias V2and the one via V3pass. The two vias V2couple the metal pattern143M1and the metal pattern144M1. The one via V3couples the metal pattern143M2and the metal pattern144M2. The upper surface144S1of the bonding layer144is provided, for example, with the metal patterns144M1and144M2similar to those of the first embodiment described above. The solder stop band17is formed on the border between the metal pattern14MC of the metal pattern144M1and the metal pattern14ME.

In this way, the light emitted from the light emitting element11is extracted from the horizontal direction, thereby allowing a metal plate to be used as the cover15. This makes it possible to further increase the cross-sectional area of a wiring line that electrically couples the light emitting element11and the outside (e.g., electrode extraction section14E1) and makes it possible to further reduce the internal resistance.

In addition, the semiconductor light emitting device10I may have a configuration as follows.FIG.26schematically illustrates another example of a planar configuration of the semiconductor light emitting device10I.FIG.27schematically illustrates a cross-sectional configuration of the semiconductor light emitting device10I taken along an IX-IX line illustrated inFIG.26. For example, a lens23may be disposed at a cutout section143X of the intermediate layer143. This lens23is, for example, a collimating lens. In a case where the light emitted from the light emitting element11is extracted from the horizontal direction as in the semiconductor light emitting device10I according to the present embodiment, a great angle of radiation may cause vignetting to occur. Mounting the lens23therefore decreases the angle of radiation and makes it possible to prevent vignetting from occurring.

10. Tenth Embodiment

FIG.28schematically illustrates an example of a planar configuration of a semiconductor light emitting device (semiconductor light emitting device10J) according to a tenth embodiment of the present disclosure.FIG.29schematically illustrates a cross-sectional configuration of the semiconductor light emitting device10J taken along an X-X line illustrated inFIG.28.FIG.30is an exploded perspective view of a configuration of the housing member14illustrated inFIG.28. The semiconductor light emitting device10J according to the present embodiment is different from that of the first embodiment described above in that a vertical resonator surface emitting laser is used as a light emitting element21.

In the present embodiment, the upper surface141S1of the first layer141is provided with the two metal patterns141M1A and141M1B that are independent from each other. The second layer142has the opening142H. The upper surface142S1is provided, for example, with the metal patterns142M1and142M2similar to the metal patterns144M1and144M2in the first embodiment described above. The metal pattern142M1includes the bonding metal pattern14MC and the metal pattern14ME included in the electrode extraction section14E1. The solder stop band17is formed on the border between the metal pattern14MC and the metal pattern14ME. The metal pattern141M1A and the metal pattern142M1are electrically coupled through the via V1and the metal pattern141M1B and the metal pattern142M2are electrically coupled through the via V2. The light emitting element21is mounted in the opening142H through the submount12.

In addition, the semiconductor light emitting device10J may be provided with a lens153on the upper surface15S1side of the cover15as illustrated inFIG.31. This makes it possible to control the angle of radiation of the light emitted from the light emitting element21. It is to be noted that the lens153may also be provided on the lower surface15S2side of the cover15. Alternatively, the lenses153may be provided on both the upper surface15S1side and the lower surface15S2side of the cover15. However, as illustrated inFIG.31, providing the lens153on the upper surface15S1side of the cover15allows for miniaturization as compared with the lens153provided on the lower surface15S2side of the cover15.

Further, the semiconductor light emitting device10J may be provided with a diffraction element154on the upper surface15S1side of the cover15as illustrated inFIG.32. Providing the diffraction element154makes it possible to convert the light emitted from the light emitting element21into a desired output such as a random dot pattern.

11. Modification Examples

Modification Example 1

FIG.33is a schematic exploded perspective view of a main portion of a light emitting apparatus (light emitting apparatus2) according to a modification example 1 of the present disclosure. This light emitting apparatus2includes the base plate31, the semiconductor light emitting device (e.g., semiconductor light emitting device10A), and the array lens33in this order. In other words, the light emitting apparatus2is not provided with the lens holding member (e.g., lens holding member32inFIG.5). The base plate31of the light emitting apparatus2includes, for example, a plate section311, a holding section312, and a terminal section313E. Except for this point, the light emitting apparatus2according to the present modification example has a configuration similar to that of the light emitting apparatus1according to the first embodiment described above. The light emitting apparatus2according to the present modification example also has similar workings and effects.

The plate section311of the base plate31is, for example, a plate member having a quadrangular planar shape. The plurality of semiconductor light emitting devices10A is placed on this plate section311, for example, in a matrix.

The holding section312has the planar shape of a quadrangular frame that surrounds the plurality of semiconductor light emitting devices10A disposed in the middle portion of the plate section311. The holding section312is in contact with the plate section311and the array lens33(frame section33F). The distance between each of the semiconductor light emitting devices10A and the lens331is adjusted in accordance with the thickness of the holding section312.

The terminal section313E has, for example, the planar shape of a band that extends in one direction (Y direction inFIG.33). The terminal section313E is provided on the plate section311. This terminal section313E extends from the inside to the outside of the holding section312. The electrode extraction sections14E1and14E2of the semiconductor light emitting device10A are electrically coupled to this terminal section313E. This electrically couples the light emitting element11to the outside.

The plate section311, the holding section312, and the terminal section313E are, for example, integrated. The plate section311includes, for example, aluminum. The holding section312includes, for example, PEEK (polyether ether ketone). The terminal section313E includes a metal material. The plate section311and the holding section312are collectively molded, for example, by insert-injection molding or the like. The plate section311may include, for example, aluminum (Al), copper (Cu), copper tungsten (Cu—W), aluminum nitride (AlN), or the like. The holding section312may include, for example, alumina, aluminum nitride, Kovar, or the like. In this case, the plate section311and the holding section312are insulated from the terminal section313E, for example, by low-melting glass or the like.

Modification Example 2

The plurality of respective semiconductor light emitting devices10A (light emitting elements11) placed on the base plate31may emit pieces of light in a plurality of wavelength ranges. The plurality of semiconductor light emitting devices10A placed on the base plate31may include, for example, the semiconductor light emitting device10A including the light emitting element11that emits light in the red wavelength range, the semiconductor light emitting device10A including the light emitting element11that emits light in the blue wavelength range, and the semiconductor light emitting device10A including the light emitting element11that emits light in the green wavelength range. The ratio and disposition of the semiconductor light emitting devices10A of the respective colors are adjusted on the basis of a luminosity curve and an output (mW and Im). This makes it possible to extract white light from the light emitting apparatus1. In this case, for example, the light emitting apparatus1includes a diffuser panel or the like. The light emitted from the semiconductor light emitting device10A passes through the lens331and the diffuser panel or the like.

In this way, it is possible to easily place, on the base plate31, the semiconductor light emitting devices10A (light emitting elements11) that emit pieces of light in wavelength ranges different from each other at a desired ratio and in desired disposition. Therefore, it is possible to easily adjust the entire optical balance.

The light emitting element11may also include LED (Light Emitting Diode) or the like. However, in the light emitting element11including a semiconductor laser element, it is possible to further increase the light intensity and recognize light at a more distant position as compared with the light emitting element11including LED.

12. Application Example

The light emitting apparatuses1and2described in the first embodiment and the modification examples described above are applicable, for example, to a projection display.

FIG.34is a diagram illustrating a configuration example of a projection display (projection display200) to which the light emitting apparatuses1and2are applied as light sources. This projection display200is, for example, a display that projects an image on a screen. The projection display200is coupled to an external image supplying apparatus such as a computer including PC or the like or a variety of image players through I/F (interface). The projection display200makes a projection on the screen or the like on the basis of an image signal that is inputted to this I/F. It is to be noted that a configuration of the projection display200described below is an example. The projection display according to the present technology is not limited to such a configuration.

The projection display200includes the light emitting apparatuses1and2, a multi-lens array212, a PBS array213, a focus lens214, mirrors215aand215cto215e, dichroic mirrors216and217, light modulators218ato218c, a dichroic prism219, and a projection lens220.

In each of the light emitting apparatuses1and2, the light emitted from the light emitting element11passes through the array lens33and is extracted as collimated light. This light enters the multi-lens array212. The multi-lens array212has a structure in which a plurality of lens elements is provided in an array. The multi-lens array212condenses the light emitted from each of the light emitting apparatuses1and2. The PBS array213polarizes the light condensed by the multi-lens array212as light having a predetermined polarization direction, for example, a P-polarized wave. The focus lens214condenses the light that has been converted by the PBS array213into the light having a predetermined polarization direction.

The dichroic mirror216transmits red light R and reflects green light G and blue light B of the pieces of light that have entered the dichroic mirror216through the focus lens214and the mirror215e. The red light R transmitted by the dichroic mirror216is guided to the light modulator218athrough the mirror215a.

The dichroic mirror217transmits the blue light B and reflects the green light G of the pieces of light reflected by the dichroic mirror216. The green light G reflected by the dichroic mirror217is guided to the light modulator218b. In contrast, the blue light B transmitted by the dichroic mirror217is guided to the light modulator218cthrough the mirror215dand the mirror215c.

The light modulators218ato218coptically modulate the respective pieces of incident color light and input the respective pieces of optically modulated color light to the dichroic prism219. The dichroic prism219combines the respective pieces of color light that have been optically modulated and entered the dichroic prism219into one optical axis. The respective pieces of combined color light are projected onto a screen or the like through the projection lens220.

In the projection display200, the three light modulators218ato218ccorresponding to the three primary colors of red, green, and blue are combined and display any color. In other words, the projection display200is a so-called three-plate projection display.

The present technology has been described with reference to the first to tenth embodiments, the modification examples, and the application example, but the present technology is not limited to the embodiments or the like described above. A variety of modifications are possible. For example, the components, the disposition, the number, and the like of the light emitting apparatuses1and2exemplified in the embodiments or the like described above are merely examples. Each of the light emitting apparatuses1and2does not have to include all the components. In addition, each of the light emitting apparatuses1and2may further include another component.

In addition, in the first embodiment or the like described above, the example has been described in which the bonding member16is used as an electrical conduction path between the cathode of the light emitting element11and the electrode extraction section14E1, but this is not limitative. For example, the bonding member16may also be used as an electrical conduction path between the anode of the light emitting element11and the electrode extraction section14E2. In addition, in the first embodiment or the like described above, the example has been described in which the one light emitting element11is housed in the recessed section14C, but the two or more light emitting elements11may be housed. Moreover, the light emitting elements11corresponding to wavelengths different from each other may be housed.

Further, the above-described light emitting apparatuses1and2provided with the terminal sections322E and313E in the lens holding member32or the base plate31have been described. Each of the terminal sections322E and313E is for electrically coupling the light emitting element11and the outside. There may be, however, provided terminal sections separately from the lens holding member32or the base plate31.

It is to be noted that the effects described in this specification are mere examples, but not limited thereto. In addition, there may be other effects.

It is to be noted that the technology may have a configuration as follows. According to the present technology having the following configurations, the electrically conductive bonding section is electrically coupled to the wiring structure provided in the first housing member. This increases the cross-sectional area of a wiring line that electrically couples the light emitting element and the outside. The electrically conductive bonding section bonds the first housing member and the second housing member. The light emitting element is housed in the first housing member and the second housing member. This allows the internal resistance to be reduced.

(1)

A semiconductor light emitting device including:a light emitting element;a first housing member and a second housing member at least one of which has a wiring structure, the first housing member and the second housing member housing the light emitting element, the wiring structure electrically coupling the light emitting element and an outside; andan electrically conductive bonding section that bonds the first housing member and the second housing member, the electrically conductive bonding section being electrically coupled to the wiring structure.
(2)

The semiconductor light emitting device according to (1), in whichthe first housing member includes a first recessed section, a first layer, and a second layer, the first recessed section forming a housing space in which the light emitting element is housed, the first layer being included in a bottom surface of the first recessed section, the second layer being included in a side surface of the first recessed section,one or more first metal patterns are formed on the first layer, andone or more second metal patterns are formed on the second layer, the one or more second metal patterns being electrically coupled to at least a portion of the one or more first metal patterns.
(3)

The semiconductor light emitting device according to (2), in which the one or more first metal patterns and the one or more second metal patterns are electrically coupled through through vias, the through vias penetrating the second layer.

(4)

The semiconductor light emitting device according to (2) or (3), in whichthe second layer includes a bonding layer and an intermediate layer, the bonding layer being bonded to the second housing member, the intermediate layer being disposed between the bonding layer and the first layer, andthe one or more second metal patterns are formed on each of the bonding layer and the intermediate layer.
(5)

The semiconductor light emitting device according to (4), in which at least a portion of the one or more second metal patterns formed on the bonding layer is included in the electrically conductive bonding section.

(6)

The semiconductor light emitting device according to (4) or (5), in which the one or more second metal patterns formed on the bonding layer include an electrode extraction section, the electrode extraction section being electrically coupled to an electrode of the light emitting element.

(7)

The semiconductor light emitting device according to (6), in which the electrically conductive bonding section and the electrode extraction section are electrically coupled.

(8)

The semiconductor light emitting device according to any of (1) to (7), in whichthe first housing member and the second housing member are bonded with solder interposed in between, andthe solder is included in the electrically conductive bonding section.
(9)

The semiconductor light emitting device according to any of (1) to (8), in which the second housing member includes a second recessed section, the second recessed section forming a housing space in which the light emitting element is housed.

(10)

The semiconductor light emitting device according to any of (1) to (9), in whichthe second housing member has light transmissivity, andlight emitted from the light emitting element is outputted to the outside through the second housing member.
(11)

The semiconductor light emitting device according to (10), in whichthe second housing member has a light emitting surface on an opposite side to a bonded surface to the first housing member, andthe light emitting surface has a lens shape.
(12)

The semiconductor light emitting device according to any of (2) to (11), in whichthe first housing member has light transmissivity on at least a portion of a side surface included in the first recessed section, andlight emitted from the light emitting element is emitted to the outside through the side surface.
(13)

The semiconductor light emitting device according to any of (2) to (12), further including a reflecting member that reflects light emitted from the light emitting element, in whichthe reflecting member is housed in the first recessed section along with the light emitting element.
(14)

The semiconductor light emitting device according to any of (1) to (13), further including a submount, in whichthe submount is disposed between the light emitting element and the first housing member.
(15)

The semiconductor light emitting device according to (14), in which the submount has electrical conductivity.

(16)

The semiconductor light emitting device according to any of (1) to (15), in which the light emitting element includes a semiconductor laser.

(17)

The semiconductor light emitting device according to (16), in which the semiconductor laser includes a gallium nitride (GaN)-based semiconductor.

(18)

The semiconductor light emitting device according to any of (1) to (17), including the light emitting elements that emit pieces of light having wavelengths different from each other.

(19)

The semiconductor light emitting device according to any of (3) to (18), in which the reflecting member includes a mirror.

This application claims the priority on the basis of Japanese Patent Application No. 2019-018059 filed with Japan Patent Office on Feb. 4, 2019, the entire contents of which are incorporated in this application by reference.

It should be understood by those skilled in the art that various modifications, combinations, sub-combinations, and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.