JP2019029366A - Light source module and vehicular lamp - Google Patents

Abstract

To provide a light source module and a vehicular lamp capable of preventing light from leaking while improving luminous intensity by mounting light emitting elements at high density.SOLUTION: A light source module includes a submount (43a) in which a submount wiring is formed on one surface, a plurality of light emitting elements (43c) mounted on the submount wiring along the first direction, and a light reflective resin portion (43d) that is filled between adjacent light emitting elements (43c) and seals the side surface of the light emitting element (43c), and a distance (d1) between the side faces of the adjacent light emitting elements (43c) is in the range of 0.1 mm to 0.6 mm.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a light source module and a vehicle lamp, and more particularly to a light source module and a vehicle lamp in which a plurality of light emitting diodes are provided on the surface of an element mounting substrate.

  In general, a vehicular lamp can be switched between a low beam and a high beam. The low beam illuminates the neighborhood with a predetermined illuminance, and the light distribution regulation is determined so as not to give glare to the oncoming vehicle and the preceding vehicle, and is mainly used when traveling in an urban area. On the other hand, the high beam illuminates a wide area in the front and a distant area with a relatively high illuminance, and is mainly used when traveling at high speed on a road with few oncoming vehicles and preceding vehicles. Therefore, although the high beam is more visible to the driver than the low beam, there is a problem that glare is given to the driver or pedestrian of the vehicle existing in front of the vehicle.

  In recent years, an ADB (Adaptive Driving Beam) technique has been proposed that dynamically and adaptively controls a high-beam light distribution pattern based on the surroundings of a vehicle. ADB technology reduces glare given to a vehicle or a pedestrian by detecting the presence of a preceding vehicle, an oncoming vehicle or a pedestrian in front of the vehicle, and dimming a region corresponding to the vehicle or the pedestrian. is there. In such ADB technology, there has been proposed one in which light emitting elements such as a plurality of LEDs (Light Emitting Diodes) are mounted in a row on a substrate, and the LEDs in a region corresponding to a vehicle or a pedestrian are turned off ( For example, Patent Document 1).

  Further, in recent years, there has been proposed a technique in which a large number of light emitting elements are two-dimensionally arranged on a substrate and a high beam light distribution pattern is controlled in more detail by selectively switching off and on the light emitting elements. In a vehicular lamp that performs such a two-dimensional arrangement of light-emitting elements, it is necessary to increase the mounting density of the light-emitting elements and improve the mounting position accuracy in order to irradiate a two-dimensional light distribution pattern satisfactorily. is there. When an LED is used as a light emitting element, a surface mount type package is used, and a structure in which individual LEDs are positioned and mounted on lands formed on a substrate is mounted with high density.

  FIG. 10 is a schematic plan view showing a light source module 1 using a conventionally proposed ADB technique. As shown in FIG. 10, a conventional light source module 1 has a connector 3 mounted on a substrate 2 for electrical connection to the outside, and a wiring pattern 4 is formed on the surface of the substrate 2 extending from the connector 3. A plurality of LEDs 5 are mounted on the wiring pattern 4.

Japanese Patent Laying-Open No. 2015-016773

  In such a conventional light source module 1, the space between the LEDs 5 is widened to secure the area of the heat radiation pattern, and high-density mounting is difficult. Further, since the LEDs 5 are surface-mounted with individual packages, surface mounting alignment is performed. High-density mounting is difficult from the point of accuracy. Thereby, when the space | interval of LED5 spreads, there existed a problem that it was difficult to improve the whole luminous intensity obtained by lighting adjacent LED5. In addition, in the ADB technique, the LEDs are selectively turned on one by one, and the light emission precisely controlled according to the lighting region is required, so that the light emitted from the LEDs needs to leak.

  Therefore, an object of the present invention is to provide a light source module and a vehicle lamp that can prevent light leakage while improving luminous intensity by mounting light emitting elements at high density.

  In order to solve the above problems, a light source module of the present invention includes a submount having a submount wiring formed on one surface, and a plurality of light emitting elements mounted along the first direction on the submount wiring. A light-reflective resin portion that is filled between adjacent light emitting elements and seals the side surfaces of the light emitting elements, and the distance between the side surfaces of the adjacent light emitting elements is in the range of 0.1 mm to 0.6 mm. It is characterized by that.

  In such a light source module of the present invention, the space between adjacent light emitting elements is filled with a light-reflective resin portion and sealed, and the distance between the side surfaces of the light emitting elements is in the range of 0.1 mm to 0.6 mm. It is possible to prevent light leakage while mounting the light emitting elements at high density to improve luminous intensity.

  In one embodiment of the present invention, the plurality of submounts are arranged in a first row extending in the first direction.

  In one embodiment of the present invention, the plurality of submounts are further arranged adjacent to the first row as a second row extending in the first direction.

In one embodiment of the present invention, a metal wire corresponding to each light emitting element is connected to the submount wiring, and the light emitting elements in the first row and the second row are connected to the first row. It is located between the metal wire and the metal wire connected to the second row.
In order to solve the above-described problem, a vehicular lamp according to the present invention includes any one of the light source modules described above, and selectively supplies power to the plurality of light-emitting elements. .
In such a vehicular lamp of the present invention, it is possible to prevent light leakage while improving luminous intensity by mounting light emitting elements at high density.

  In the present invention, it is possible to provide a light source module and a vehicle lamp that can prevent light leakage while improving luminous intensity by mounting light emitting elements at high density.

It is a disassembled perspective view which shows the vehicle lamp 100 in 1st Embodiment. It is a model perspective view which shows the light source module 40 in 1st Embodiment. It is a schematic plan view which shows the mounting substrate 41 in 1st Embodiment. It is a figure explaining the structure of the mounting substrate 41 in 1st Embodiment in detail, Fig.4 (a) is a disassembled perspective view, FIG.4 (b) is a schematic cross section. 4 is a schematic plan view showing a light source module 40 in a state where each member is mounted on a mounting substrate 41. FIG. It is an expansion perspective view which expands and shows submount 43. FIG. 6 is a partial enlarged cross-sectional view illustrating a state where a submount 43 is mounted on a light emitting unit mounting region 49. FIG. 6 is an enlarged plan view showing an enlarged periphery of a light emitting unit mounting area 49. FIG. 9A is a graph showing the combined luminous intensity from adjacent light emitting elements 43c in the second embodiment, and FIG. 9A shows an example where the distance of the light emitting element 43c is long and the combined luminous intensity is insufficient, and FIG. Shows an example in which the distance between the light emitting elements 43c is short and the combined luminous intensity is sufficient. It is a schematic top view which shows the light source module 1 using the ADB technique proposed conventionally.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. FIG. 1 is an exploded perspective view showing a vehicular lamp 100 according to the present embodiment. The vehicular lamp 100 includes a lens 10, a lens holder 20, a reflector 30, a light source module 40, a heat sink 50, and a cooling fan 60, and each member is positioned relative to each other and fixed by fixing means (not shown). ing.

  The lens 10 is a member that is made of a translucent material and that irradiates light from the light source module 40 forward so as to have a predetermined light distribution. The lens holder 20 is a member for holding the lens 10 while maintaining the relative positional relationship between the light source module 40 and the reflector 30. The reflector 30 is a member that is disposed in front of the light source module 40 and reflects light from the light source module 40 forward, and corresponds to an optical member in the present invention.

  The light source module 40 is a member that emits light according to electric power and signals supplied from the outside of the vehicular lamp 100, and will be described in detail later. The heat sink 50 is a member having good thermal conductivity disposed in contact with the light source module 40 on the back surface of the light source module 40, and the cooling fan 60 in which heat radiation fins are formed on the back surface side is provided on the back surface side of the heat sink 50. It is a member which is arrange | positioned and produces the flow of air by supplying electric power.

  In the vehicular lamp 100, when electric power and a signal are supplied from the outside, the light source module 40 emits light according to the electric power and the signal, and the light reflected forward by the reflector 30 passes through the lens holder 20 and the lens 10. Irradiated forward. Further, the heat accompanying the light emission of the light source module 40 is radiated into the air via the heat sink 50, and is cooled by the ventilation from the cooling fan 60.

  FIG. 2 is a schematic perspective view showing the light source module 40 in the present embodiment. The light source module 40 includes a mounting substrate 41, a wiring pattern 42, a submount 43, a power supply connector 44, a metal wire 45 a, a light absorbing resin portion 45, and a resist layer 46. An optical member mounting area 47 is formed, and an optical member fixing portion 48 is formed in the optical member mounting area 47.

  The mounting substrate 41 is a substantially flat plate member made of a material having good thermal conductivity. A wiring pattern 42 is formed on one surface, and a plurality of submounts 43 and a power supply connector 44 are mounted. Yes. A resist layer 46 is formed so as to cover the wiring pattern 42. Although the material which comprises the mounting substrate 11 is not limited, It is preferable to use metals with favorable heat conductivity, such as copper and aluminum.

  Further, as the mounting substrate 41, a composite substrate in which an insulating substrate is bonded to a conductive substrate may be used. For example, a substrate in which a glass epoxy resin layer is bonded to a metal substrate may be used. When the mounting substrate 41 is composed of a metal substrate, it is preferable to form an antioxidant film on the back side of the mounting substrate 41 in order to prevent a decrease in thermal conductivity due to oxidation of the metal material. Examples of the method for forming the antioxidant film include a preflux process and an Au plating process, but an Au plating process is preferable from the viewpoint of improving heat dissipation.

  The wiring pattern 42 is a conductive pattern formed on the surface of the mounting substrate 41, and is for securing an electrical connection from the terminal of the power supply connector 44 to the submount 43. When a conductive material is used as the mounting substrate 41, an insulating layer is formed between the wiring pattern 42 and the mounting substrate 41.

  The submount 43 is a member that is mounted on the surface of the mounting substrate 41, is electrically connected to the wiring pattern 42 by the metal wire 45a, and emits light according to the power when power is supplied through the metal wire 45a. It is. The detailed structure of the submount 43 will be described later.

  The power supply connector 44 is a member for ensuring electrical connection with the outside mounted on the surface of the mounting substrate 41, and a plurality of terminals are electrically connected to the wiring pattern 42. Although the shape of the power supply connector 44 is a substantially rectangular parallelepiped in FIG. 2, the outer shape, the terminal shape, and the like are not limited as long as they can be connected to a known cable harness.

  The metal wire 45a is a member for connecting the terminal provided on the submount 43 and the wiring pattern 42 formed on the mounting substrate 41, and is a metal conductive member that can be realized by a known wire bonding technique. is there. The material constituting the metal wire 45a is not limited, and gold, copper, aluminum, or the like can be used, but gold is preferably used.

  The light-absorbing resin portion 45 is a resin member in which an inorganic filler and a light-absorbing material are mixed in a base resin, and covers and seals the metal wire 45a. The metal wires 45a may be sealed with the light-absorbing resin portion 45 by individually sealing the metal wires 45a one by one, but it is preferable to seal a plurality of metal wires 45a at once. The base resin of the light-absorbing resin portion 45 is preferably a curable resin composition having high heat resistance, light resistance, and translucency and good handling, and includes known sealing materials such as epoxy resins and silicone resins. It is done. In particular, in order to prevent the metal wire 45a from being stressed due to expansion or contraction of the light-absorbing resin portion 45 due to heat, it is possible to use a silicone resin having a low elastic modulus after curing as the base resin. preferable. Examples of the light absorbing material mixed in the base resin include a carbon filler.

  In the light source module 40 of the present embodiment, the metal wire 45a is covered with the light-absorbing resin portion 45 and sealed, so that it is possible to prevent a conductive foreign matter from adhering to the metal wire 45a and causing a short circuit. Further, since the light-absorbing resin portion 45 is mixed with a light-absorbing material, the light from the submount 43 reaches the metal wire 45a, is reflected, and is irradiated outside the vehicular lamp 100 as stray light. Can be prevented. In particular, when the light emitting elements included in the submount 43 are selectively turned on using the ADB technique, stray light reflected by the metal wire 45a can be prevented from reaching the non-irradiation region, and the light emitting elements can be densely formed. It is possible to suppress the occurrence of glare while mounting.

  When forming the light-absorbing resin part 45, the base resin kneaded with the inorganic filler and the light-absorbing material is supplied onto the metal wire 45a with a dispenser or the like and then cured. The viscosity and thixotropy after kneading the light-absorbing material can be adjusted arbitrarily by adjusting the material selection of the base resin and the amount of inorganic filler added, taking into account the moldability after application and stress on the power supply wire. Is possible. The thixotropy is based on the injection property of the dispenser / moldability after application, at a viscosity of 23 ° C., a viscosity of 0.5 rpm and a viscosity of 5 rpm in the E type viscometer (viscosity of 0.5 rpm) / (5 rpm The viscosity is preferably 2.0 or more and 3.5 or less from the viewpoint of handling. If the thixotropy is set in this range, the fluidity of the base resin is maintained moderately, and even if the periphery of the submount 43 is not surrounded by a dam member or the like, the resin flows out and the metal wire 45a is exposed, or the metal wire 45a It is possible to prevent a gap from occurring between the gaps and the lower part.

  The resist layer 46 is an insulating film-like member formed on the surface side of the mounting substrate 41 so as to cover the wiring pattern 42. The material constituting the resist layer 46 is not limited, but in order to suppress stray light due to the difference in light reflection between the surface of the mounting substrate 41 and the wiring pattern 42, the light reflectance in the region where the resist layer 46 is formed is uniform. It is preferable to use a light-reflective material or a light-absorbing material so that

  The optical member mounting region 47 is a region on the surface of the mounting substrate 41 for mounting the reflector 30 which is an optical member, and is a region where the surface of the mounting substrate 41 is exposed without the resist layer 46 being formed. The optical member mounting area 47 is located on both sides of the mounting substrate 41 across the area where the submount 43 is mounted, and the optical member mounting area 47 is fixed by contacting the reflector 30 with the optical member mounting area 47. The reflector 30 can be disposed across 43.

  The optical member fixing portion 48 is a through hole provided in the optical member mounting area 47. The reflector 30 is brought into contact with the optical member mounting region 47, and a fixing member such as a screw is inserted into the optical member fixing portion 48 from the surface side of the mounting substrate 41 to fix the mounting substrate 41 and the reflector 30 to the heat sink 50. Although the details of the formation position of the optical member fixing portion 48 will be described later, the submount 43 is arranged between the two optical member fixing portions 48.

  FIG. 3 is a schematic plan view showing the mounting substrate 41 in the present embodiment. As shown in FIG. 2, a wiring pattern 42 is formed on the mounting substrate 41, and a resist layer 46 is formed so as to cover the wiring pattern 42. As shown in FIG. 3, the optical member mounting area 47, the light emitting section mounting area 49 for mounting the submount 43, the portion for bonding the metal wire 45a, the power supply connector mounting section 44a for mounting the power supply connector 44, and the power supply A resist layer 46 is formed in a region excluding a portion where the terminal of the connector 44 is connected.

  As described above, the light emitting unit mounting region 49 is a region on which a plurality of submounts 43 are mounted, and is formed so that the submounts 43 can be arranged in two rows with the left-right direction in the drawing as the longitudinal direction. Further, the line L1 connecting the centers of the optical member fixing portions 48 is in a positional relationship that crosses the substantial center of the light emitting portion mounting area 49 along the longitudinal direction.

  4A and 4B are diagrams for explaining in detail the structure of the mounting substrate 41 in the present embodiment, FIG. 4A is an exploded perspective view, and FIG. 4B is a schematic cross-sectional view. As shown in FIG. 4A, the mounting substrate 41 has a laminated structure of a metal plate 41a, an adhesive sheet 41b, and a glass epoxy resin layer 41c. In the adhesive sheet 41b and the glass epoxy resin layer 41c, openings 49b and 49c having shapes corresponding to the light-emitting portion mounting areas 49 are formed, and the positions of the openings 49b and 49c coincide with each other. The openings 49b and 49c may be formed in advance in predetermined regions of the adhesive sheet 41b and the glass epoxy resin layer 41c, and may be aligned and pasted. The metal plate 41a and the glass epoxy resin layer 41c are pasted with the adhesive sheet 41b. After that, the openings 49b and 49c may be collectively formed by cutting or the like.

  As shown in FIG. 4B, an adhesive sheet 41b and a glass epoxy resin layer 41c are laminated around the light emitting portion mounting region 49, and a wiring pattern 42 and a resist layer 46 are formed on the glass epoxy resin layer 41c. Yes. Inside the light emitting unit mounting region 49, a part of the surface of the metal plate 41a is exposed in a region corresponding to the openings 49b and 49c. Further, since the resist layer 46 is not formed in the optical member mounting area 47 as described above, the glass epoxy resin layer 41 c is exposed in the optical member mounting area 47.

  In the light source module 40 of the present embodiment, the resist layer 46 is not formed in the optical member mounting region 47, and the reflector 30, which is an optical member, is directly mounted and fixed on the glass epoxy resin layer 41c. Thereby, the positional deviation between the reflector 30 and the submount 43 caused by the variation in the film thickness of the resist layer 46 is suppressed, and the relative positional relationship between the optical member and the light emitting element 43c is precisely aligned, thereby providing good light distribution characteristics. Can be irradiated with light. In addition, by attaching the glass epoxy resin layer 41c to the metal plate 41a using the adhesive sheet 41b, there is no need to form an insulating layer containing a high thermal conductive filler on the metal plate 41a. Reduction can be achieved.

  FIG. 5 is a schematic plan view showing the light source module 40 in a state where each member is mounted on the mounting substrate 41. Solder is applied to the power supply connector mounting portion 44a and the terminal connection portion of the mounting substrate 41 shown in FIG. 4, and the surface mount type power supply connector 44 is mounted by solder reflow. In addition, the back surface of the submount 43 and the metal plate 41a exposed in the light emitting unit mounting area 49 are fixed with an adhesive, and a plurality of submounts 43 are arranged in two rows along the longitudinal direction. At 45a, the submount 43 and the wiring pattern 42 are electrically connected. Finally, the light absorbing resin portion 45 is applied to the plurality of metal wires 45a with a dispenser and cured. As described above, the line L1 connecting the centers of the optical member fixing portions 48 is located substantially at the center along the longitudinal direction of the submounts 43 arranged in two rows.

  FIG. 6 is an enlarged perspective view showing the submount 43 in an enlarged manner. In the submount 43, a plurality of submount wirings 43b are formed on a submount substrate 43a, a plurality of light emitting elements 43c are mounted on the submount wiring 43b, and the side surfaces of the plurality of light emitting elements 43c are collectively reflected. Resin portion 43d is sealed. Further, the light-reflective resin portion 43d is not formed on a part of the submount substrate 43a, and the surface of the submount substrate 43a and the submount wiring 43b are exposed. The light emitting element 43c is flip-chip mounted across the adjacent submount wirings 43b inside the light reflective resin portion 43d.

  The submount substrate 43a is a substantially rectangular flat plate member made of a material having insulating properties and good thermal conductivity, and is made of, for example, Si or AlN. The submount wiring 43b is a conductive pattern formed on one surface of the submount substrate 43a. The submount wiring 43b is electrically connected to the light emitting element 43c and is wire-bonded with the metal wire 45a.

  The light emitting element 43c is a member that is electrically connected to the two metal wires 45a and emits light when a voltage is applied between the metal wires 45a, and is configured by a combination of an LED chip and a phosphor material. . As the LED chip, a known compound semiconductor material such as GaN that emits blue, purple, or ultraviolet light as primary light can be used. As the phosphor material, a known material that is excited by primary light and emits desired secondary light can be used. A material that obtains white color by mixing primary light from an LED chip, or a plurality of phosphor materials can be used. It is possible to use one that obtains white color by mixing a plurality of secondary lights.

  The light-reflective resin portion 43d is a member in which light-reflective fine particles are mixed into the base resin, and includes, for example, a white resin in which fine particles such as titanium oxide are mixed, and reflects light emitted from the light emitting element 43c well. The light-reflective resin portion 43d is filled with the side surface sealed and filled with the light-emitting element 43c, and reflects light emitted from the side surface of the light-emitting element 43c toward the inside of the light-emitting element 43c. As a result, light emitted from the light emitting element 43c does not leak sideways from the side surface of the light emitting element 43c, and is favorably irradiated to the outside from the upper surface of the light emitting element 43c.

  As shown in FIG. 6, in the plurality of light emitting elements 43c arranged along the longitudinal direction of the submount 43, the distance between the side surfaces of the adjacent light emitting elements 43c is d1, and the distance between the centers of the light emitting elements 43c is d2. As shown in FIG. 2, a plurality of submounts 43 are arranged in two upper and lower rows to constitute a light source unit, and a plurality of submount substrates 43a are arranged adjacent to each other by extending in the longitudinal direction. The sub-mount substrate 43a in the second row is arranged adjacent to the first row.

  FIG. 7 is a partially enlarged cross-sectional view showing a state where the submount 43 is mounted on the light emitting unit mounting region 49. The submount substrate 43a is fixed with an adhesive on the metal plate 41a exposed in the light emitting portion mounting area 49, and the side surface of the light emitting element 43c on the submount substrate 43a is sealed with a light reflective resin portion 43d. One end of the metal wire 45a is wire-bonded to a region where the light-reflective resin portion 43d is not formed on the submount substrate 43a.

  In the light source module 40 of the present embodiment, a plurality of light emitting elements 43c are mounted on the submount substrate 43a, and metal wires 45a are wire-bonded to the submount wiring 43b formed on the surface of the submount substrate 43a to generate electric power. Supply. As a result, it is possible to supply a larger current with the metal wire 45a having a higher melting point than to mount the light emitting element 43c directly on the wiring pattern 42 using solder, and to increase the luminous intensity of the light source module 40. . Further, the submount substrate 43a is mounted on the metal plate 41a exposed in the light emitting unit mounting region 49, and is fixed by using an adhesive having a high heat resistant temperature, so that the light emitting element 43c is mounted using solder. The heat-resistant temperature can be set high, and a large current can be supplied and the light intensity can be increased.

  As shown in FIG. 7, the wiring pattern 42 formed on the glass epoxy resin layer 41c is covered with a resist layer 46, but the resist layer 46 is formed at the position where the other end of the metal wire 45a is wire-bonded. Not. The entire metal wire 45a is sealed with a light-absorbing resin portion 45, and the wire bond positions at both ends of the metal wire 45a and the upper and lower portions of the metal wire 45a are filled. The light absorbing resin portion 45 is formed adjacent to the light reflecting resin portion 43d at the wire bond position of the submount substrate 43a. In FIG. 7, the adhesive sheet 41b is not shown.

  As described above, the submount 43 is mounted on the metal plate 41a without the glass epoxy resin layer 41c in the light emitting portion mounting region 49, and the height dimension of the light emitting element in the submount 43 is the glass epoxy resin layer 41c. Greater than thickness dimension. Here, the height dimension of the light emitting element in the submount 43 is a distance from the bottom surface of the submount substrate 43a to the upper surface of the light emitting element 43c, and is about 1.3 mm, for example.

  In the light source module 40 of this embodiment, since the height of the submount 43 is larger than the thickness of the glass epoxy resin layer 41c, the upper surface of the light emitting element 43c that is the light extraction surface of the submount 43 is higher than the glass epoxy resin layer 41c. Located in. Thereby, it can prevent that the light irradiated from the submount 43 injects into the side surface of the glass epoxy resin layer 41c, and is blocked | interrupted, can extract light well and can irradiate with a desired light distribution characteristic.

  In the light source module 40 of the present embodiment, the optical member fixing portion 48 is formed by punching from the back side of the mounting substrate 41 after the metal plate 41a and the glass epoxy resin layer 41c are bonded together by the adhesive sheet 41b. When the thickness of the glass epoxy resin layer 41c is 0.05 mm to 0.2 mm, preferably 0.075 mm to 0.15 mm, burrs generated on the metal plate 41a during punching are suppressed by the glass epoxy resin layer 41c. The reflector 30, which is a member, can be accurately aligned and fixed.

  FIG. 8 is an enlarged plan view showing the periphery of the light emitting unit mounting area 49 in an enlarged manner. As shown in FIG. 8, the light-absorbing resin portion 45 collectively seals a plurality of metal wires 45a, covers the wiring pattern 42 from the wire bond position of the wiring pattern 42 to the wire bond position of the submount 43, and reflects light. It is formed up to a position adjacent to the resin portion 43d. A plurality of submounts 43 are arranged along the left-right direction, and two rows are arranged adjacent to each other in the up-down direction to constitute the light source unit of the present invention.

  In the light source section in which the submounts 43 are arranged in two upper and lower rows, the light emitting elements 43c are also arranged in two rows, and a line L2 shown in FIG. 8 is a light emission center line indicating an intermediate position between the two rows of light emitting elements 43c. . The light emission center line L2 substantially coincides with the line L1 connecting the centers of the optical member fixing portions 48 shown in FIG. 5, and is an optical member on an extension line of the light emission center lines L2 of the plurality of light emitting elements 43c. The reflector 30 is fixed.

  In the light source module 40 of the present embodiment, the line L1 connecting the centers of the optical member fixing portions 48 and the light emission center line L2 of the submount 43 substantially coincide with each other, so that the mounting substrate 41 is warped. In addition, it is possible to reduce the warpage by fastening the reflector 30 on the light emission center line L2, and to appropriately set the positional relationship between the light source unit and the optical member. Further, when the mounting substrate 41 and the reflector 30 are fastened together including the heat sink 50, the back surface side of the light emitting portion mounting region 49 can be brought into close contact with the heat sink, and the heat dissipation characteristics similar to those of the mounting substrate 41 without warping. Can be obtained.

  The wire bonding position of the wiring pattern 42 is provided along the upper and lower sides of the light emitting portion mounting region 49 in the drawing, and a metal wire 45a is wire-bonded to the upper row of submounts 43 from the upper side in the drawing. The metal wires 45a are wire-bonded to the submounts 43 in the lower row in the figure from below in the figure. Therefore, the light emitting elements 43c in the first row and the second row are located between the metal wire 45a connected to the first row and the metal wire 45a connected to the second row.

  In the vehicular lamp 100 of the present invention, power is selectively supplied from the outside to the light emitting element 43c through the power supply connector 44, the wiring pattern 42, the metal wire 45a, and the submount wiring 43b, and the light emitting element 43c is turned on. To do. The light distribution distribution in the entire light source unit is determined by turning on the selected light emitting element 43c among the plurality of submounts 43 constituting the light source unit, and the vehicular lamp according to the ADB technique through the reflector 30 and the lens 10 A two-dimensional light distribution pattern is irradiated in front of 100.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The description overlapping with the first embodiment is omitted. This embodiment can also be applied when not using the ADB technique. The configuration of the vehicular lamp 100 and the configuration of the light source module 40 are the same as those in the first embodiment, and a description thereof will be omitted.

  FIG. 9 is a graph showing the combined luminous intensity from the adjacent light emitting elements 43c in this embodiment, and FIG. 9A shows an example in which the combined luminous intensity is insufficient because the distance of the light emitting elements 43c is long. (B) shows an example in which the distance between the light emitting elements 43c is short and the combined luminous intensity is sufficient. In the figure, the horizontal axis indicates the position along the longitudinal direction of the submount 43, and the vertical axis indicates the luminous intensity. The broken line in the figure indicates the luminous intensity of light emitted from one light emitting element 43c, and the solid line in the figure indicates the combined luminous intensity of light emitted from two adjacent light emitting elements 43c.

  When the distance d1 between the side surfaces of adjacent light emitting elements 43c shown in FIG. 6 exceeds 0.6 mm, the peak of the combined luminous intensity is small as shown in FIG. 9A, and the light is emitted from one light emitting element 43c. It only improves by a few percent over the light intensity. By setting the distance d1 between the side surfaces to 0.6 mm or less, the peak of the combined luminous intensity is increased as shown in FIG. 9B, and the luminous intensity irradiated from one light emitting element 43c can be improved by 20% or more. it can. In particular, when the ADB technique is applied, the light emitting element 43c is selectively turned on and off to precisely control the irradiated region and the non-irradiated region. Therefore, the higher the combined luminous intensity of the irradiated region, the higher the contrast with the non-irradiated region. Can be improved.

  When the distance d1 between the side surfaces is less than 0.1 mm, the thickness of the light-reflective resin portion 43d filling the side surface of the light emitting element 43c becomes insufficient, and light leaks from the side surface, resulting in one light emitting element 43c. The intensity of the light emitted from the light will decrease. Further, the light intensity leaks from the side surface, resulting in a decrease in the combined luminous intensity. In particular, when the light emitting element 43c is selectively turned on by applying the ADB technology, there is a possibility that light leaked from the side surface may be emitted in the same manner as light emitted from the non-lighting light emitting element 43c. It becomes difficult to irradiate a two-dimensional light distribution pattern.

  The distance between the light emitting elements 43c and the combined luminous intensity when the light source module 40 of the present embodiment includes a plurality of light emitting elements 43c as the submount 43 and when one conventional LED chip is a chip size package (CSP). The relationship is shown in Table 1. The relative value is shown with the combined luminous intensity being 100 when the light emitting element interval is 0.6 mm in the conventional chip size package.

  As shown in Table 1, in the conventional chip size package, the light emitting element interval is 0.6 mm and the combined luminous intensity is 100, and 0.2 mm and the combined luminous intensity is 119. On the other hand, in the submount 43 of this embodiment, the distance d1 between the side surfaces of the light emitting element 43c is 0.6 mm, the combined luminous intensity is 112, the combined luminous intensity is 140 at 0.2 mm, and the synthetic luminous intensity is 147 at 0.1 mm. is there.

  Therefore, in the light source module 40 of this embodiment, the distance d1 between the side surfaces of the light emitting element 43c is preferably in the range of 0.1 mm to 0.6 mm. Similarly, the interval between the light emitting elements 43c in the plurality of submounts 43 is preferably in the range of 0.1 mm to 0.6 mm. By setting the distance d1 between the side surfaces within this range, it is possible to improve the combined luminous intensity while preventing light leakage from the side surfaces. In addition, when the ADB technique is applied, the contrast between the irradiated region and the non-irradiated region can be increased and a desired two-dimensional light distribution pattern can be irradiated well.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Vehicle lamp 10 ... Lens 20 ... Lens holder 30 ... Reflector 40 ... Light source module 50 ... Heat sink 60 ... Cooling fan 11 ... Mounting substrate 41 ... Mounting substrate 41a ... Metal plate 41b ... Adhesive sheet 41c ... Glass epoxy resin layer 42 ... Wiring pattern 43 ... submount 43a ... submount substrate 43b ... submount wiring 43c ... light emitting element 43d ... light reflecting resin portion 44 ... feed connector 44a ... feed connector mounting portion 45 ... light absorbing resin portion 45a ... metal wire 46 ... Resist layer 47 ... optical member mounting area 48 ... optical member fixing part 49 ... light emitting part mounting area 49a, 49b ... opening

Claims (5)

A submount having a submount wiring formed on one surface;
A plurality of light emitting elements mounted along the first direction on the submount wiring;
A light-reflective resin portion that is filled between adjacent light-emitting elements and seals the side surfaces of the light-emitting elements;
The distance between the side surfaces of the adjacent light emitting elements is in the range of 0.1 mm to 0.6 mm. The light source module according to claim 1,
The light source module, wherein the plurality of submounts are arranged in a first row extending in the first direction. The light source module according to claim 2,
Further, the plurality of submounts are arranged adjacent to the first row as a second row extending in the first direction. The light source module according to claim 3,
A metal wire corresponding to each light emitting element is connected to the submount wiring,
The light emitting elements of the first row and the second row are located between the metal wire connected to the first row and the metal wire connected to the second row. A light source module. A light source module according to any one of claims 1 to 4, comprising:
A vehicle lamp characterized by selectively supplying electric power to the plurality of light emitting elements.