JP6211326B2 - Light source device and vehicle lamp - Google Patents

Description

  The present invention relates to a light source device used as a light source of a lamp mounted on a vehicle such as an automobile, and more particularly to a light source device integrally provided with a connector for power feeding and a vehicle lamp using the light source device.

  A light source device using a semiconductor light emitting element such as an LED as a light source of a vehicle lamp (lamp) is provided. Patent Document 1 discloses a configuration in which an FPC (flexible wiring board) on which an LED is mounted is mounted on a connector housing that can be attached to and detached from the lamp. That is, the FPC on which the LED is mounted is integrally supported by a connector housing formed of resin, and a part of the FPC is protruded in a cavity provided in the connector housing, so that the protruding portion is used for power supply. It is configured to connect to an external connector as a connector electrode and to supply power to the LED. According to this light source device, it can be applied to a lamp with the same handling as a conventional incandescent bulb socket.

JP 2012-146601 A

  In the technique of Patent Document 1, since the connector housing is made of resin, there is a problem that heat generated by the LED is hardly transmitted to the connector housing, and a sufficient heat dissipation effect cannot be obtained. Therefore, it is considered that the connector housing is formed of a metal material having excellent heat dissipation, such as ADC (aluminum die casting). However, since ADC is conductive, a connector electrode for power feeding is configured by a part of the FPC. Then, there is a problem that the connector electrode contacts the connector housing and is electrically short-circuited. In order to prevent this short circuit, it is conceivable that an insulator made of an insulating material is interposed between the ADC and the connector electrode. However, the assembly process for incorporating the insulator into the connector housing becomes complicated, resulting in high costs. Become.

  An object of the present invention is to provide a light source device and a vehicular lamp that are excellent in heat dissipation and can be easily assembled at low cost.

The present invention is a light source device including a light emitting element unit including a unit body on which a light emitting module including a semiconductor light emitting element is mounted, and a base including a connector unit for supplying power from an external power source to the semiconductor light emitting element . The light emitting element unit is configured so that the light emitting module and the unit main body are integrated and detachable from the base, the light source device can be mounted on the reflector of the lamp, and the unit main body is made of a material having higher heat conductivity than the base. Formed, the base is formed of an insulating material, the light emitting element unit and the base are integrally configured, the connector portion is electrically connected to the light emitting module, and the light source device is mounted on the reflector, the unit main body on the back side of the reflector It is the structure which is partly exposed.

In the present invention, the light emitting element unit includes a power supply pad electrically connected to the light emitting module, and the connector portion is in electrical contact with the power supply pad when the light emitting element unit and the base are integrally formed. In addition, the light emitting element unit and the base can be integrated toward the direction of the light emitting optical axis of the semiconductor light emitting element, and the connector portion has a configuration in which an external power source is connected from the direction of the light emitting optical axis or from the direction intersecting therewith. To do. Here, the base can be attached to the lamp, and the light emitting element unit can be attached to the base. Alternatively, the light emitting element unit can be attached to the lamp, and the base can be attached to the light emitting element unit.

  In the vehicular lamp of the present invention, the light emitting element unit guides light emitted from the semiconductor light emitting element, and an optical cap made of a light guide that emits the guided light toward a required region can be attached. Used as a vehicle lamp.

  According to the present invention, since the unit body on which the light emitting module including the semiconductor light emitting element is mounted is formed of a material having higher heat conductivity than the base, the heat generated in the light emitting module can be effectively radiated through the unit body. Can do. Moreover, since the base provided with the connector part for supplying the power of the external power source to the light emitting element is formed of an insulating material, the electrical insulation state of the connector part can be maintained. Therefore, parts and structures for ensuring electrical insulation in the connector portion are unnecessary, and the assembly of the light source device is facilitated and can be configured at low cost. Further, even when the light emitting module unit and the base are integrally formed, even if the light emitting module and the connector portion are electrically connected, the connector portion can be prevented from being short-circuited to the base, and the semiconductor light emitting device can be protected. The light emission state can be secured.

  According to the present invention, the light emitting element unit includes the power supply pad electrically connected to the light emitting module, and the connector portion is automatically electrically connected to the power supply pad when the light emitting element unit and the base are integrated. Therefore, when the light emitting element unit and the base are integrated, a wiring operation for electrically connecting the light emitting element unit and the base becomes unnecessary, and further assembly and cost reduction are possible. In addition, since the external power supply is connected from the direction of the light-emitting optical axis or the direction intersecting this, the connector part has a degree of freedom in the direction of connecting the external power supply when the light source device is mounted on the lamp. Work becomes easy.

  Further, according to the present invention, the base can be attached to the lamp and the light emitting element unit can be attached to the base, or the light emitting element unit can be attached to the lamp and the base can be attached to the light emitting element unit. Thus, it is possible to replace one by removing it from the lamp while one is attached to the lamp, or it is possible to replace both by removing them from the lamp at once, which is advantageous for maintenance work.

1 is a schematic horizontal sectional view in which a light source device according to a first embodiment of the present invention is applied to a clearance lamp. The expanded sectional view which follows the II-II line of FIG. FIG. 2 is a schematic partial exploded perspective view of the light source device according to the first embodiment. The disassembled perspective view of an LED unit. FIG. 6 is a longitudinal sectional view of a light source device according to a second embodiment. FIG. 4 is a schematic partial cross-sectional view of a light source device according to a second embodiment. The partial perspective view of the support structure of an optical cap. Sectional drawing of an optical cap and its modification. Sectional drawing of the modification of a connector electrode.

(Embodiment 1)
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a horizontal sectional view in which the light source device of Embodiment 1 of the present invention is applied to a clearance lamp of an automobile. FIG. 1 shows an example of a left head lamp. A clearance lamp CLL is disposed in a lamp housing 1 including a lamp body 1a and a front light transmitting cover 1b together with a low beam lamp unit LoL and a high beam lamp unit HiL. The clearance lamp CLL includes a reflector 12 formed in a part of a pseudo reflector 11 called an extension built in the lamp housing 1, and a light source mounting hole 13 provided at a substantially central position of the reflector 12. The light source device 2 is detachably mounted. The light source mounting hole 13 is formed as a bayonet hole. As will be described later, the light source device 2 is inserted into the light source mounting hole 13 and can be mounted on the reflector 12 by rotating around the hole axis. is there.

  The light source device 2 includes an LED unit 3 and a base 4 as shown in FIG. 2 as a sectional view taken along the line II-II in FIG. 1 and as shown in FIG. The base 4 is attachable to and detachable from the light source mounting hole 13 of the reflector 12, and an external connector 5 connected to an external power source (not shown) such as an in-vehicle battery can be connected. The LED unit 3 can be attached to and detached from the base 4, is equipped with an LED 31 as a light source, and is electrically connected to a connector electrode 43 provided on the base 4 when mounted on the base 4. Yes. The LED 31 is a semiconductor light emitting element in the present invention, and therefore the LED unit 3 is a light emitting element unit in the present invention.

  The LED unit 3 has a unit main body 30 formed by ADC. 4 is an exploded perspective view of the LED unit 3. An annular groove 32a and a circular flange 32b are integrally formed on the outer peripheral surface of the base end portion 32 of the unit body 30, and a gasket ring 33 is formed in the annular groove 32a. Is retained. The circular flange 32b has mounting tabs 32c projecting in an outer diameter direction at two locations in the circumferential direction and opening holes 32d are opened, and are attached to the base 4 with a small screw 34. Yes. Further, the distal end portion 35 of the unit main body 30 has a substantially trapezoidal shape in which a part of a cylinder is cut out in a region excluding a proximal end portion. A tip end surface 35a of the tip end portion 35 directed in the column axis direction is formed in a plane perpendicular to the column axis direction, and two guide pins 36 protrude in the column axis direction. An FPC (flexible printed circuit board) 37 is arranged in a bent state so as to cover the front end surface 35a.

  The FPC 37 is a substrate for constituting the light emitting module according to the present invention, and a required conductive circuit pattern 37b is formed on the surface of a flexible insulating layer 37a having an elongated shape, and mechanical strength is increased on the back surface. It is configured as a metal base FPC having a metal film 37d of aluminum or the like, and is bent in a U-shape in the plate thickness direction with the back surface inside. Two chip-type LEDs 31 are mounted side by side on a part of the surface of the central region in the length direction, and two side edges of the central region in the width direction can be fitted to the guide pins 36. The guide groove 37c is cut away. Various electronic components 38 constituting a lighting circuit for causing the LED 31 to emit light are mounted on the respective surfaces of both end regions sandwiching the central region of the FPC 37 in the length direction. Further, two power supply pads 39 formed of a part of the conductive circuit pattern 37b are arranged side by side in the width direction on the surface of one end of the both end regions. These power supply pads 39 are formed by exposing a part of the surface of the conductive circuit pattern 37b, and can be electrically connected to the connector electrode 43 of the base 4 as will be described later. ing.

  The FPC 37 as the light emitting module configured as described above is attached so as to cover the front end surface 35a of the unit main body 30 so that the guide groove 37c in the center region is fitted to the guide pin 36 on the front end surface of the unit main body. At the same time, almost the entire back surface including the central region is bonded to the tip portion 35 with an adhesive having high heat conductivity. In the attached state, the two LEDs 31 are positioned in front of the front end surface 35 a of the unit body 3. In addition, in the bonded state, the electronic component 38 mounted on the FPC 37 is configured not to protrude outward from the circumferential surface of the unit body 30.

  The base 4 shown in FIGS. 2 and 3 is formed by insulating resin molding, and a cylindrical portion 41 having a hollow hole into which the LED unit 3 can be inserted, and a base end side of the cylindrical portion 41 The connector portion 42 is formed integrally with a part of the circumferential surface in a direction substantially perpendicular to the cylinder axis direction. A circular flange 41a and a bayonet piece 41b are formed on the circumferential surface on the distal end side of the cylindrical portion 41, and are attached to the light source mounting hole 13 of the reflector 12 in a bayonet structure. That is, by inserting the bayonet piece 41b into the light source mounting hole 13 and rotating the base 4 by a predetermined angle in the cylinder axis direction, the inner edge portion of the light source mounting hole 13 is sandwiched between the bayonet piece 41b and the circular flange 41a. It is the structure to do. A gasket ring 44 is disposed between the circular flange 41a and the bayonet piece 41b to ensure waterproofing with the reflector 12. In addition, two mounting tabs 45 are formed in the circumferential direction at the base end of the cylindrical portion 41 so as to protrude in the outer diameter direction, and screw holes 45a are opened in the cylindrical axis direction in these mounting tabs 45, respectively. Yes.

  The connector part 42 is formed with a cavity 42a having an open bottom surface, and two connector electrodes 43 are arranged in the cavity 42a side by side. The connector electrode 43 is formed by bending an elongated metal piece, and the abutting portion 43a on one end side is bent back so as to generate an elastic force in the upward direction in the drawing, and the inside of the cylindrical portion 41 of the base 4 is formed. It is supported by a part of the circumference below the circumference. Here, the contact portions 43 a of the two connector electrodes 43 are arranged side by side in the circumferential direction of the cylindrical portion 41. Further, the fitting portion 43b on the other end side of the connector electrode 43 is configured as a two-layered strip that is folded back in the thickness direction, and the slit 41c provided in a part of the circumference of the cylindrical portion 41 is formed from the inner diameter side. It is inserted and protrudes into the cavity 42a. And the connector electrode 43 is supported by the base 4 by engaging the latching piece 43c cut and raised by a part of fitting part 43b with the groove part 42b of the cavity 42a. The fitting portion 43b of the connector electrode 43 can be electrically connected to the external connector electrode 51 of the external connector 5 when the external connector 5 is fitted.

  To assemble the light source device 2 of the first embodiment, the LED unit 3 is inserted into the cylindrical portion 41 from the base end side of the cylindrical portion 41 of the base 4, and the insertion hole 32d of the mounting tab 32c of the circular flange 32b; After the screw holes 45a of the mounting tab 45 are opposed to each other, the machine screws 34 are screwed into these holes to fasten and integrate them. By this fastening, the axial direction and circumferential direction of the LED unit 3 with respect to the base 4 are performed, and the LED unit 3 and the base 4 are waterproofed by the gasket ring 33. Further, since the two power supply pads 39 of the LED unit 3 are positioned to face the contact portions 43a of the connector electrodes 43 of the base 4 by this fastening, the electrical connection with the power supply pads 39 is caused by the elastic force of the contact portions 43a. Is done. The light source device 2 assembled in this way is fixedly supported by the reflector 12 by mounting the base 4 in the light source mounting hole 13 of the reflector 12 of the clearance lamp CLL by the above-described bayonet structure. In this fixedly supported state, the circular flange 30 b of the LED unit 3 is exposed from the base 4 on the back side of the reflector 12.

  2, the connector electrode 43 is electrically connected to the external connector electrode 51 of the external connector 5 by fitting the external connector 5 to the connector portion 42 of the base 4. Is supplied to the connector electrode 43. Further, this power is supplied to the power supply pad 39 in contact with the contact portion 43a of the connector electrode 43, and further supplied to the LED 31 through the conductive circuit pattern 37b, so that the LED 31 emits light. The light emitted and emitted from the LED 31 is projected onto the reflecting surface of the reflector 12 and reflected in a predetermined direction, so that light irradiation with a required light distribution required for the clear lamp CLL is performed.

  In the light source device 2, heat generated when the LED 31 emits light is transferred to the unit main body 30 of the LED unit 3 through the FPC 37. Since the unit main body 30 is composed of ADC, the heat transfer is high, and the heat transferred is immediately transferred to the entire area of the unit main body 30. Then, heat is radiated from the surface of the exposed circular flange 30b of the unit body 30 to the outside, or heat is transferred from the unit body 30 to the base 4 and radiated from the base 4, so that the heat radiation effect of the LED 31 is enhanced. The connector electrode 43 electrically connected to the LED unit 3 is formed of an independent metal piece, but the base 4 is insulated in the base 4 because the cylindrical portion 41 and the connector portion 42 are formed of insulating resin. It is supported in a state where the state is maintained. Accordingly, an insulator or the like for insulating the connector electrode 43 is unnecessary, and the connector electrode 43 can be attached simply by being inserted into the cylindrical portion 41 or the connector portion 42 of the base 4 and can be easily assembled. Can do. Further, when the LED unit 3 and the base 4 are assembled, the connector electrode 43 can be electrically connected to the power supply pad 39 to supply external power to the LED 31, so that the LED unit 3 and the base 4 are electrically connected during assembly. Wiring work is not required, and further assembly and cost reduction are possible.

  Further, in the light source device 2, only the LED unit 3 can be replaced while the base 4 is mounted on the reflector 12. That is, the LED unit 3 can be pulled out from the cylindrical portion 41 of the base 4 by removing the two small screws 34. At this time, the electrical connection between the connector electrode 43 and the power supply pad 39 is automatically canceled. Therefore, if the standard of the unit main body 30 of the LED unit 3 is the same, such as the shape, dimensions, etc., it is easy to replace the LED unit with a different standard LED or electronic component, realizing lamp maintenance and performance improvement. This is advantageous.

  Alternatively, the entire light source device 2 can be removed from the reflector 12. That is, by rotating the base 4 around the axis by a small angle, the coupling with the reflector 12 by the bayonet structure is released, and the light source device 2 can be removed from the light source mounting hole 13 of the reflector 12. After the light source device 2 is removed, the LED unit 3 may be removed from the base 4 and replaced as described above. Alternatively, the entire light source device 2 may be replaced with a different one.

(Embodiment 2)
FIG. 5 is a longitudinal sectional view of a second embodiment in which the present invention is configured as a light source device applied to a headlamp or a fog lamp, and FIG. 6 is a partially exploded perspective view thereof. The basic configuration of the light source device 2A of the second embodiment is the same as that of the first embodiment. The light source device 2A includes an LED unit 6 having a unit body formed of ADC and a base 7 formed of resin. Here, as can be seen from the description below, the connector portion 72 of the base 7 is configured in the direction of the optical axis of the LED. In addition, about the reflector of a headlamp or a fog lamp, only one part is shown by the code | symbol 12A in FIG.

  The unit main body 60 of the LED unit 6 is formed by an ADC into a cylindrical shape in which a tip end portion 60a has a small diameter and a base end portion 60b is integrated in a cylinder axis direction. A plurality of radiating fins 60c are projected in the radial direction on the outer peripheral surface of the large-diameter base end 60b. The small-diameter tip 60a is formed with a pedestal 60d that is formed by cutting out both side regions facing each other in a circular arc shape. The pedestal portion 60d has a front end surface 60e oriented in a direction perpendicular to the cylinder axis direction of the unit main body 60, and the front end surface 60e has two insertion holes 60f in the cylinder axis direction at a predetermined interval in the radial direction. It is open. Further, bayonet pieces 60g are formed at a plurality of circumferential locations on the outer peripheral surface of the tip portion 60a, and optical cap support pieces 60h are formed at a plurality of circumferential locations different from these bayonet segments 60g. The bayonet piece 60g has the same configuration as the bayonet piece 41b of the first embodiment, and is detachable from the light source mounting hole 13A of the reflector 12A. The optical cap support piece 60h is formed as a rectangular frame on which the optical cap 8 is engaged and supported, as will be described later.

  In addition, the unit main body 60 supports the FPC 62 that includes the LED 61 and constitutes a light emitting module. The FPC 62 is bent and formed in an L shape in the plate thickness direction, and three chip-shaped LEDs 61 are mounted on the surface of the short side portion 62a directed in the tip direction. Various electronic components 63 are mounted on the surface of the long side portion 62b oriented in the cylinder axis direction, and three power supply pads 64 are arranged in the width direction on the surface of the base end side of the long side portion 62b. It is arranged. The power supply pad 64 is configured by a part of a conductive circuit pattern (not shown) formed on the surface of the FPC 62, and the conductive surface is exposed in a portion configured as the power supply pad 64. This is the same as in the first embodiment. Reinforcing plates 65a and 65b made of a flat plate having high rigidity are bonded to the back surfaces of the short side portion 62a and the long side portion 62b, respectively, and the shapes of the FPC 62 are held by these reinforcing plates 65a and 65b. When the FPC 62 is supported by the unit body 60, the back surface of the short side portion 62a is in contact with the distal end surface 60e of the pedestal portion 60d, and the long side portion 60b is on the proximal side along the cylinder axis direction. To the upper side surface of the pedestal 60d. In addition, support tabs 65c are provided on both sides of the reinforcing plate 65a bonded to the back surface of the short side portion 60a so as to protrude outward from both sides, and each support tab 65c has an insertion hole 60f in the pedestal portion 60d. A connecting hole 65d is opened at a position corresponding to.

  The base 7 is formed by resin molding, and can be inserted into the base end portion 60b of the unit main body 60 of the LED unit 6 from the base end side. The base 7 is provided with a circular flange 71 at a substantially intermediate position in the length direction, that is, in the direction directed in the tube axis direction of the LED unit 6, and the base end side of the circular flange 71 is configured as a connector portion 72. A connecting portion 73 and a connector electrode support portion 74 are formed on the distal end side of the circular flange 71. When the base 7 is inserted into the unit main body 60 of the LED unit 6, the circular flange 71 is brought into contact with the base end of the unit main body 60, and the connecting portion 73 and the connector electrode support portion 74 are housed inside the unit main body 60. The connector 72 is projected from the base end side of the unit main body 60 in the cylinder axis direction.

  The connecting portion 73 of the base 7 includes two elongated connecting rods 75 projecting from the circular flange 71 toward the distal end, and a hook rod 76 disposed at a vertical position adjacent to the connector electrode support portion 74. It consists of and. The connecting rod 75 is formed to have a length substantially equal to the length of the unit body 60 in the cylinder axis direction, and the tip 75a is formed to have a small diameter. When the base 7 is inserted into the unit body 60 of the LED unit 6, the connecting rod 75 is inserted into the insertion hole 60f of the pedestal portion 60d when the base 7 is inserted into the unit body 60, and the reinforcing plate 65a of the FPC 62 is further inserted. A connecting hole 65d of a support tab 65c provided in the tube is penetrated in the cylinder axis direction. In addition, the hook rod 76 engages with a protrusion 60 i formed so that the hook portion 76 a at the tip protrudes in the inner diameter direction inside the unit main body 60 when the base 7 is inserted into the unit main body 60 of the LED unit 6. Thus, the base 7 is locked to the LED unit 6.

  Three connector electrodes 77 are supported on the connector electrode support portion 74. Each connector electrode 77 is formed in a crank shape by bending an elongated metal piece in the plate thickness direction. The contact portion 77a of each connector electrode 77 directed in the left direction in the figure is folded inward so as to generate an elastic force in the thickness direction. Further, the fitting portion 77b directed to the right direction has a two-sheet configuration in which the fitting portion 77b is folded back and overlapped in the plate thickness direction. Further, a locking piece 77c is cut and raised on the lower surface of the fitting portion 77b. Then, the fitting portion 77b is inserted from the distal end side of the base 7 into a cylindrical axial slit 74a provided in the connector electrode support portion 74. The connector electrode 77 is supported by the connector electrode support part 74 by being latched by 74b.

  The connector portion 72 protrudes from the circular flange 71 toward the proximal end side in the cylinder axis direction, and forms a rectangular cavity 72a therein. The three connector electrodes 77 supported by the connector electrode support portion 74 are supported in a state where each fitting portion 77b protrudes toward the opening of the cavity 72a in the cavity 72a. An external connector similar to that described in the first embodiment can be fitted to the cavity 72a, and the external connector electrode is projected and supported in the cavity 72a when the external connector is fitted. The connector electrode 77 is fitted and electrically connected to the fitting portion 77b.

  In the second embodiment, when the light source device 2A is assembled, the base 7 supporting the connector electrode 77 is inserted into the unit main body 60 of the LED unit 6 from the base end side. By this insertion, the hook portions 76 a of the two hook rods 76 of the base 7 are engaged with the protruding portions 60 i of the unit body 60, and the base 7 is integrated with the LED unit 6. At the same time, the distal end portion 75a of the connecting rod 75 is inserted through the insertion hole 60f of the pedestal portion 60d of the unit body 60, and further penetrates the connection hole 65d of the reinforcing plate 65a of the FPC 62. Then, since the tip end portion 75a is caulked by heat caulking or the like after passing through the connecting hole 65d, the base 7 is connected to the LED unit 6 by the connecting rod 75, and the FPC 62 is connected to the LED unit 6. It is integrally supported by the pedestal 60d. Further, when the base 7 is inserted into the unit main body 60 in this way, the contact portions 77a of the three connector electrodes 77 supported by the base 7 are brought into contact with the three power supply pads 64 provided on the FPC 62, and are electrically connected to each other. Will be connected.

  Further, in the second embodiment, after assembling the light source device 2A in this way, the optical cap 8 is attached to the front end side of the LED unit 6. As shown in FIG. 6, the optical cap 8 has a light guide body 80 having a base end portion 80a having a cylindrical shape and a tip end portion 80b having a substantially columnar shape, that is, a translucent material such as a transparent resin. The diameter of the light guide 80 is substantially equal to the diameter of the tip 60a of the unit body 60 of the LED unit 6. FIG. 7 is an enlarged perspective view of a part of the optical cap 8 attached to the LED unit 6. The base end portion 80 a of the light guide 80 of the optical cap 8 has two hook pieces 81 at a plurality of locations around the circumference. Is protruded in the axial direction, and between the circumferential directions of the respective hook pieces 81, a contact piece 82 is formed so as to contact the circumferential end surface 60 j of the tip end portion 60 a of the unit body 60. When the optical cap 8 is attached to the LED unit 6, the abutment piece 82 abuts on the circumferential short surface 60 j of the unit main body 60, and two hook pieces 81 are provided at the distal end portion 60 a of the unit main body 60. Each is engaged with the optical cap support piece 60h. Thereby, the optical cap 8 is integrally supported by the front-end | tip part 60a of the unit main body 60 in the coaxial state.

  FIG. 8A is a cross-sectional view of the optical cap 8, and the base end portion 80 a of the cylindrical light guide 80 is supported by the LED unit 6 so as to surround the LED 61. The base end surface 80c of the tip portion 80b formed in a columnar shape is formed substantially in a conical surface, and guides the light emitted from each LED 61 in the tip direction along the axial direction as a parallel light flux. . Further, the central front end surface 80d of the front end portion 80b of the light guide 80 has an inverted conical shape, and an inner ring front end surface 80e and an outer ring front end surface 80f having a triangular cross section are formed so as to surround the central front end surface 80d. Has been. By providing the central front end surface 80d, the inner ring front end surface 80e, and the outer ring front end surface 80f, the light guided in the axial direction from the base end surface 80c to the inside of the light guide body 80 is transmitted to the front end surfaces 80d, 80e, By being refracted or internally reflected at 80f, the LED 61 is diffused over a wide area extending from the optical axis direction to the circumferential direction. Here, since the light guide 80 is designed so that the light emitted from each of the tip surfaces 80d, 80e, and 80f is directed to almost the entire surface of the reflector 12A, the illumination range required for the headlamp and the fog lamp is reduced. Light irradiation with a wide light distribution characteristic can be realized.

  As described above, in the light source device 2A according to the second embodiment in which the LED unit 6, the base 7, and the optical cap 8 are integrated, the LED unit 6 is housed in the light source mounting hole 13A of the reflector 12A as shown in FIG. As a result, the reflector 12A is mounted by the bayonet structure. That is, the gasket ring 66 is fitted to the small-diameter distal end portion 60a, and the distal end portion 60a is used as the light source of the reflector 12A until the distal end surface of the large-diameter base end portion 60b of the LED unit 6 contacts the back surface of the reflector 12A. The bayonet piece 60g is engaged with the inner edge portion of the light source mounting hole 13A by being inserted into the mounting hole 13A and rotated by a predetermined angle on the mounting hole 13A, so that the bayonet structure can be mounted. In this state, most of the LED unit 6 is exposed on the back side of the reflector 12A. Accordingly, by fitting an external connector to the connector portion 72 of the base 7 from the rear side of the light source device 2A, the connector electrode 77 is electrically connected to the external connector electrode of the external connector in the same manner as in the first embodiment. External power from the connector is supplied to the connector electrode 77, and this power is further supplied to the power supply pad 64 in contact with the contact portion 77 a of the connector electrode 77. As a result, the LED 61 is fed through the conductive circuit pattern of the FPC 62 and emits light. The light emitted and emitted from the LED 61 is guided through the light guide 80 of the optical cap 8, and is emitted as diffused light from the respective end faces 80d, 80e, and 80f. By providing the optical cap 8, the emitted light is projected on almost the entire surface of the reflector 12A and reflected in a predetermined direction, so that light irradiation with a required light distribution required for the headlamp or fog lamp is performed. Is done.

  In the light source device 2A of the second embodiment, heat generated when the LED 61 emits light is transferred to the unit main body 60 via the FPC 62 and the reinforcing plates 65a and 65b. Since the unit main body 60 is composed of ADC, the heat transfer is high, and the heat transferred is immediately transferred to the entire area of the unit main body 60 and radiated, so that the heat dissipation effect of the LED 61 is enhanced. In particular, since the outer periphery of the unit main body 60 is exposed to the back side of the reflector 12A and a plurality of heat radiation fins 60c are formed, the heat radiation effect can be enhanced as compared with the first embodiment. The connector electrode 77 for electrical connection to the power supply pad 64 of the LED unit 6 is formed of an independent metal piece, but the base 7 supporting the connector electrode 77 is formed of an insulating resin. The connector electrode 77 does not cause an electrical short circuit with respect to the base 7 or the LED unit 6. Therefore, an insulator or the like for insulating the connector electrode 77 is unnecessary, and the light source device 2A can be easily assembled.

  In the second embodiment, the tip portion 75a of the connecting rod 75 of the base 7 is crimped when the base 7 and the LED unit 6 are integrated, so that the entire light source device 2A is removed from the reflector 12A during maintenance or replacement. It will be. At this time, by rotating the light source device 2A around the axis by a predetermined angle, the coupling with the reflector 12A by the bayonet structure is released, and the light source device 2A can be removed and replaced from the light source mounting hole 13A. If a snap structure or a fastener structure for connecting the distal end portion 75a of the connecting rod 75 by press fitting is used, after the light source device 2A is removed from the reflector 12A, the engagement of the fastener structure of the connecting rod 75 is released and hooked at the same time. It is also possible to remove the LED unit 6 from the base 7 by releasing the engagement of the rod 76 with the LED unit 6 and replace only the LED unit 6. Furthermore, it is also possible to remove and replace only the FPC 62 from the LED unit 6.

  Furthermore, in this light source device 2A, the optical cap 8 can be exchanged. By releasing the engagement between the hook piece 81 provided on the optical cap 8 and the optical cap support piece 60h of the unit main body 60 of the LED unit 6, the optical cap 8 is removed from the LED unit 6 and replaced with an optical cap having a different configuration. can do. For example, the caps can be replaced with optical caps 8A and 8B having different tip end face shapes as shown in FIGS. The optical cap 8A shown in FIG. 8B has basically the same configuration as the optical cap 8 shown in FIG. 8A, but the cross-sectional shape of the outer ring front end face 80g is changed. Here, the outer ring front end surface 80g is formed such that the outer peripheral surface is a cylindrical surface and the inner peripheral surface is an acute cone surface. Thus, by forming the outer ring front end face 80g, light can be diffused at a wider angle. The optical cap 8B of FIG. 8C is formed with a convex spherical surface whose base end face 80h is opposed to each LED 61, the distal end face is a central distal end face 80i having a convex spherical face, and a peripheral distal end face 80j having a conical surface. Formed as. Further, the intermediate portion in the length direction of the distal end portion 80b of the light guide 80 is formed to have a slightly small diameter. Thereby, the light flux density of the light guided into the light guide 80 from the base end portion 80a can be increased, and diffused light having a high luminous intensity can be formed. It is also possible not to attach the optical cap 8.

  In the first and second embodiments, the connector electrode is brought into contact with the power supply pad provided on the surface of the FPC of the LED unit from the surface side. The connector electrode is, for example, as shown in a modification of the second embodiment in FIG. In addition, an end portion of the FPC 62 provided with the power supply pad 64 may be sandwiched. That is, the contact portion 77a of the connector electrode 77 is bent in a U-shape, and an opposing portion 77d that faces the contact portion 77a at a required interval is formed, so that the end portion of the FPC 62 is made to face the opposing portion 77d. And the contact portion 77a, and the electrical connection state to the power supply pad 64 can be stabilized. In particular, in the case of the configuration in which the base 7 is coupled to the LED unit 6 from the cylindrical axis direction as in the second embodiment, the power supply pad 64 and the connector electrode 77 are adopted by adopting such a configuration. It is possible to make the electrical connection to the stable and reliable.

  In the first and second embodiments, the unit body of the LED unit is formed of ADC, but may be formed of other metal material having high heat conductivity and excellent heat dissipation. On the other hand, the base may be made of a resin other than nylon or other materials as long as the material has electrical insulation with respect to the connector electrode.

  In Embodiment 1, the base is attached to the reflector with a bayonet structure, and in Embodiment 2, the LED unit is attached to the reflector with a bayonet structure, but each may have a different attachment structure. For example, an attachment structure using screws or an attachment structure using hooks or springs may be used. In the case of Embodiment 1, metal plating may be applied to the surface of the base so that the heat transmitted from the LED unit can be easily radiated from the surface of the base.

In the first and second embodiments, an example in which a chip-type LED is mounted on an FPC is shown. However, a discrete-type LED may be used, or a light source device in which a semiconductor light emitting element other than an LED is mounted may be used. . Further, the FPC is not limited to the metal-base FPC shown in the first embodiment or the FPC having the reinforcing plate shown in the second embodiment, and may be composed of a normal PCB (printed circuit board).

In the first and second embodiments, the present invention is applied to a light source device such as a clearance lamp, a head lamp, and a fog lamp. However, if the light source device is a lamp using a semiconductor light emitting element such as an LED as a light source, a tail lamp (stop lamp) Needless to say, it can be configured as a light source device for other lamps such as DRL (Daytime Running Lamp) and TSL (Turn Signal Lamp).

  The present invention can be applied to a light source device of a lamp using a semiconductor light emitting element as a light source.

DESCRIPTION OF SYMBOLS 1 Lamp housing 2, 2A Light source device 3 LED unit (Embodiment 1)
4 Base (Embodiment 1)
5 External connector 6 LED unit (Embodiment 2)
7 Base (Embodiment 2)
8 Optical cap 12, 12A Reflector 13, 13A Light source mounting hole 30, 60 Unit body 31, 61 LED
37,62 FPC (Light Emitting Module)
39, 64 Power supply pads 42, 72 Connector portions 43, 77, 77A Connector electrode 75 Connecting rod 76 Hook rod HiL High beam lamp unit LoL Low beam lamp unit CLL Clearance lamp

Claims (6)

A light source device comprising: a light emitting element unit including a unit main body on which a light emitting module including a semiconductor light emitting element is mounted; and a base including a connector unit for supplying power from an external power source to the light emitting element. Is configured such that the light emitting module and the unit main body are integrated and detachable from the base , the light source device can be attached to a reflector of a lamp, and the unit main body is more thermally conductive than the base. The base is made of an insulating material, the light emitting device unit and the base are integrally configured, the connector portion is electrically connected to the light emitting module, and the light source device is attached to the reflector. In this state, a part of the unit main body is exposed on the back side of the reflector. Source apparatus. The light emitting element unit includes a power supply pad electrically connected to the light emitting module, and the connector portion is configured to be in electrical contact with the power supply pad when the light emitting element unit and the base are integrally configured. The light source device according to claim 1.   The light emitting element unit and the base can be integrated toward the direction of the light emitting optical axis of the semiconductor light emitting element, and the external power source is connected to the connector portion from the direction of the light emitting optical axis or the direction intersecting with the light emitting optical axis. The light source device according to claim 1, wherein the light source device is configured as described above.   4. The light source device according to claim 1, wherein the base can be attached to the lamp, and the light emitting element unit can be attached to the base. 5.   4. The light source device according to claim 1, wherein the light emitting element unit can be attached to a lamp, and the base can be attached to the light emitting element unit.   The lamp is used in a vehicle, and the light emitting element unit can be equipped with an optical cap made of a light guide that guides light emitted from the semiconductor light emitting element and emits the guided light toward a required region. A vehicle lamp equipped with the light source device according to any one of claims 1 to 5.

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