JP4515391B2 - Vehicle headlamp - Google Patents

Description

  The present invention relates to a vehicle headlamp in which a plurality of lamp units each having a light emitting element as a light source are supported by a lamp body via a metal bracket so as to be tiltable.

  Many vehicle headlamps have a configuration in which a plurality of lamp units are housed in a lamp chamber formed by a lamp body and a translucent cover attached to a front end opening of the lamp body. In recent years, a lamp unit using a light emitting element such as a light emitting diode as a light source has also been adopted in a vehicle headlamp.

  In “Patent Document 1” and “Patent Document 2”, in a vehicle headlamp including a plurality of lamp units that use such a light emitting element as a light source, the plurality of lamp units are made of metal brackets from the rear side. The metal bracket is supported so as to be tiltable with respect to the lamp body.

JP 2004-31224 A JP 2005-166687 A

  As described in the above-mentioned “Patent Document 1”, when a plurality of lamp units are supported by a metal bracket, the heat generated in the light-emitting elements of each lamp unit can be increased by a heat conduction action, resulting in a large heat capacity. This makes it possible to suppress the temperature rise of the light emitting element, but since the metal bracket is housed in the lamp chamber, the heat conducted from the light emitting element can be reduced. There is a problem that it cannot be sufficiently dissipated.

  On the other hand, as described in the above-mentioned “Patent Document 2”, if the metal bracket is arranged so as to face the outside space of the lamp room from the opening formed on the rear wall of the lamp body, the heat dissipation performance is improved. It becomes possible to make it. At this time, since the metal bracket is supported so as to be tiltable with respect to the lamp body, a flexible back cover is attached to the opening of the lamp body to achieve a seal between them. It is configured to ensure a waterproof function.

  However, in such a configuration in which the seal between the lamp body and the metal bracket tilting with respect to the lamp body is performed by mounting a flexible back cover, it is not easy to sufficiently secure the waterproof function of the lamp. There is a problem.

  The present invention has been made in view of such circumstances, and includes a vehicular headlight in which a plurality of lamp units each having a light emitting element as a light source are supported by a lamp body via a metal bracket so as to be tiltable. An object of the present invention is to provide a vehicular headlamp that can secure a heat dissipation function of a lamp while ensuring a sufficient waterproof function of the lamp.

  The present invention has a configuration in which a metal back cover is attached to an opening formed in the rear wall of the lamp body, and the metal back cover and the metal bracket that supports the plurality of lamp units are in a predetermined position. By adopting a configuration arranged in a relationship, the above object is achieved.

That is, the vehicle headlamp according to the present invention is
In a lamp chamber formed by a lamp body and a translucent cover attached to the front end opening of the lamp body, a plurality of lamp units each having a light emitting element as a light source and a metal made to support the plurality of lamp units from the rear side In the vehicle headlamp in which the bracket is housed and the metal bracket is supported to be tiltable with respect to the lamp body,
A plurality of first fins extending in a predetermined direction toward the rear are formed on the rear surface of the metal bracket at a predetermined interval in a direction orthogonal to the predetermined direction.
An opening is formed in the rear wall of the lamp body, and a metal back cover is attached to the opening.
A plurality of second fins extending in the predetermined direction toward the front are formed on the front surface of the metal back cover at predetermined intervals in a direction orthogonal to the predetermined direction, and the rear surface of the metal back cover A plurality of third fins extending rearward are formed,
The mounting of the metal back cover to the opening is performed in a state where the second fins are arranged so as to be alternately and non-contactingly superposed on the first fins. Is.

  The type of the “light emitting element” is not particularly limited, and for example, a light emitting diode or a laser diode can be employed. Further, the specific configuration of the “light emitting element” is not particularly limited, and for example, a single light emitting chip may be mounted, or a plurality of light emitting chips may be mounted. May be.

  The “metal bracket” is supported so as to be tiltable with respect to the lamp body, but the specific configuration for realizing this is not particularly limited.

  The specific direction of the “predetermined direction” is not particularly limited, and for example, a vertical direction or a horizontal direction can be adopted.

  The “plurality of first fins” are formed at a predetermined interval in a direction orthogonal to the predetermined direction. However, at this time, the first fins are not necessarily formed at an equal interval. Further, the specific shape of each “first fin” is not particularly limited as long as it is formed to extend rearward in the predetermined direction.

  The “plurality of second fins” are formed at predetermined intervals in a direction orthogonal to the predetermined direction. At this time, the second fins are alternately non-contacted with the first fins. The specific value of the “predetermined interval” is not particularly limited as long as it is within a range that can be arranged to overlap. Further, the specific shape of each “second fin” is not particularly limited as long as it is formed to extend forward in the predetermined direction.

  The number of the “plural lamp units” and the specific configuration of each “lamp unit” are not particularly limited.

  “Metal” in the “metal bracket” and “metal back cover” includes not only one metal but also an alloy made of two or more metals.

  As shown in the above configuration, the vehicular headlamp according to the present invention uses a light emitting element as a light source in a lamp chamber formed by a lamp body and a translucent cover attached to a front end opening of the lamp body. A plurality of lamp units and a metal bracket that supports the plurality of lamp units are accommodated, and the metal bracket is supported to be tiltable with respect to the lamp body. A plurality of first fins extending rearward in a predetermined direction are formed on the rear surface at predetermined intervals in a direction orthogonal to the first fin, and an opening is formed in the rear wall of the lamp body. In addition, a metal back cover is attached to the opening, and a plurality of second frames extending in the predetermined direction toward the front are provided on the front surface of the metal back cover. And a plurality of third fins extending rearward are formed on the rear surface of the metal back cover. Since the attachment of the back cover to the opening is performed in a state in which the second fins are arranged so as to alternately and non-contact with the first fins, the following operational effects can be obtained. Can do.

  That is, when each lamp unit is lit, the heat generated by the light emitting element is transferred to a metal bracket having a large heat capacity by heat conduction, but this heat is further approached to the metal bracket by heat radiation. The metal back cover is also moved to dissipate from the metal back cover to the space outside the lamp room.

  At this time, the metal back cover is attached to the opening portion in a state where the second fins are arranged so as to be alternately and non-contactingly superposed on the first fins. Despite the presence of the layer, the heat transfer efficiency can be increased, whereby the heat of the metal bracket can be efficiently transferred to the metal back cover. Since the metal back cover is formed with a plurality of third fins extending rearward, the heat transferred to the metal back cover can be efficiently dissipated to the space outside the lamp chamber. .

  Moreover, since the metal back cover is maintained in a non-contact state with respect to the metal bracket, even if the metal bracket is tilted, the mounting state of the metal back cover to the lamp body is not affected at all. Accordingly, it is possible to sufficiently ensure the waterproof function of the lamp.

  As described above, according to the present invention, in a vehicle headlamp in which a plurality of lamp units each having a light emitting element as a light source are supported on a lamp body via a metal bracket so as to be tiltable, the waterproof function of the lamp is sufficiently provided. In addition, the heat dissipation function can be ensured.

  In the above configuration, when the metal bracket is supported on the lamp body in such a manner that the metal bracket can pivot in the horizontal direction, the following effects can be obtained by setting the predetermined direction to be substantially horizontal. be able to.

  That is, in a vehicle headlamp having a so-called swivel function that changes the direction of the lamp unit in the horizontal direction according to the vehicle running condition, the metal bracket can be turned in the horizontal direction with respect to the lamp body. Will be supported. At that time, the displacement amount due to the turning motion of the metal bracket becomes considerably large. Therefore, in the lamp configuration as described in the above-mentioned “Patent Document 2”, the lighting device does not hinder the turning motion of the metal bracket. It is not easy to ensure the waterproof function, and this complicates the lamp structure.

  In contrast, in the vehicle headlamp according to the present invention, if the predetermined direction (that is, the direction in which each first fin and each second fin extends) is set to a substantially horizontal direction, the metal bracket turns in the horizontal direction. Even so, the first fin and the second fin of the metal back cover can be prevented from interfering with each other. And thereby, the heat dissipation performance can be ensured without complicating the lamp configuration.

  In this case, the metal bracket is supported in such a manner that it can be tilted in the vertical direction with respect to the lamp body, and the first fin and the second fin are tilted in the vertical direction of the metal bracket. Even if the so-called leveling function that changes the direction of the lamp unit in the vertical direction according to the vehicle running condition is provided to the vehicle headlamp, if it is arranged at intervals that do not interfere with each other within the range The interference between the first fin of the metal bracket and the second fin of the metal back cover can be prevented in advance.

  In the above configuration, if the third fins formed on the rear surface of the metal back cover are formed so as to extend along a substantially vertical plane and are arranged at a predetermined interval in the horizontal direction, the third fins are mutually connected. Ascending airflow can be generated in the space between them, whereby heat dissipation from each third fin can be performed very efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side sectional view showing a vehicle headlamp according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. FIG.

  As shown in these drawings, a vehicle headlamp 10 according to the present embodiment is a headlamp provided on a right side portion of a front end of a vehicle body, and includes a lamp body 12 and a front end opening portion 12a of the lamp body 12. Five lamp units 30 are housed in a lamp chamber formed by the transparent transparent cover 14 made of transparent resin attached. In the vehicle headlamp 10, a low beam light distribution pattern is formed by light irradiation from the five lamp units 30.

  The five lamp units 30 are all configured as projector-type lamp units, and are supported by a common metal bracket 20 from the rear side. The metal bracket 20 is supported on the metal frame 22 supported by the lamp body 12 in a manner capable of turning about the vertical axis Ax1.

  That is, the metal bracket 20 is inserted into a downward boss 22a formed at the upper end portion of the metal frame 22 at the pin 20a formed on the vertical axis Ax1 at the upper end portion, and the lower end thereof. The upward output shaft 50a of the swivel actuator 50 attached to the lower end portion of the metal frame 22 is fitted into the downward boss 20b formed on the vertical axis Ax1 in the portion.

  By driving the swivel actuator 50, the metal bracket 20, together with the five lamp units 30, is within a predetermined angle range about the vertical axis Ax 1 with respect to the metal frame 22 (for example, left and right in the vehicle longitudinal direction). It turns in an angle range of about 15 °. At this time, the driving of the swivel actuator 50 is performed based on a control signal from a control unit (not shown) in accordance with the vehicle traveling state.

  The metal frame 22 is formed so as to surround the metal bracket 20 in a substantially rectangular shape when viewed from the front of the lamp. At the upper left and right ends thereof, the metal frame 22 is attached to the lamp body 12 via a pair of aiming screws 52 extending in the front-rear direction. While being supported, the lower right end portion (the lower left end portion in the front view of the lamp) is supported by the lamp body 12 via the leveling actuator 56.

  At that time, each aiming screw 52 is rotatably supported at the rear end wall 12b of the lamp body 12 at the base end portion, and is engaged and connected to the metal frame 22 via the aiming nut 54 at a portion in the vicinity of the tip end. ing. Then, each of the aiming screws 52 is appropriately rotated by a driver to tilt the metal frame 22 in the vertical direction or the horizontal direction, thereby collectively adjusting the optical axes of the five lamp units 30. Yes. When the optical axis adjustment is completed, the direction of the optical axis Ax of each lamp unit 30 is set downward about 0.5 to 0.6 ° with respect to the vehicle longitudinal direction. .

  On the other hand, the leveling actuator 56 is fixedly supported on the rear wall 12b of the lamp body 12 in a state where the output shaft 56a is arranged to protrude forward. The output shaft 56a of the leveling actuator 62 is engaged and connected to the metal frame 22 at the tip.

  Then, by driving the leveling actuator 56, the metal frame 22 is within a predetermined angular range around the horizontal axis connecting the aiming nuts 54 (for example, within an angular range of about 4 ° above and below the vehicle longitudinal direction). The five lamp units 30 together with the metal bracket 20 are tilted in the vertical direction. At this time, the leveling actuator 56 is driven based on a control signal from a control unit (not shown) in accordance with the vehicle traveling condition, whereby the optical axis Ax of each lamp unit 30 is moved with respect to the vehicle front road surface. It is always held at an optimum angle (specifically, an angle extending in a downward direction of about 0.5 to 0.6 ° with respect to the vehicle longitudinal direction described above).

  The metal bracket 20 is formed of a die cast product (for example, an aluminum die cast product), and a vertical panel portion 20A formed so as to extend along a vertical plane perpendicular to the vehicle longitudinal direction, and the vertical panel portion. On the front surface of 20A, five unit mounting portions 20B formed so as to extend forward in a shelf shape, and on the rear surface of the vertical panel portion 20A, in the vertical direction so as to extend rearward along a horizontal plane. It consists of eight first fins 20C formed at equal intervals, and the pins 20a and bosses 20b are formed at both upper and lower ends of the vertical panel portion 20A.

  The five unit mounting portions 20B are arranged so as to be positioned in the vicinity of the apexes of the regular pentagon when viewed from the front of the lamp, and each lamp unit 30 is fixed to the metal bracket 20 at each unit mounting portion 20B. .

  The eight first fins 20C are all formed in the same shape, and the interval between the first fins 20C is about 3 to 5 times the thickness of the base end portion of the first fins 20C. Is set to a value. The front end surface (that is, the rear end surface) 20Ca of each of the first fins 20C is chamfered at both left and right end portions thereof, so that when the metal bracket 20 is turned, the first fins 20C are made of metal. Interference with the back cover 24 (which will be described later) is prevented in advance.

  Each lamp unit 30 is arranged such that its optical axis Ax extends in parallel to each other in a direction orthogonal to the vertical panel portion 20A.

  Each of the lamp units 30 includes a projection lens 32 disposed on the optical axis Ax, a light emitting element 34 disposed behind the projection lens 32, and a reflector disposed so as to cover the light emitting element 34 from above. 36, and a light control member 38 disposed between the light emitting element 34 and the projection lens 32.

  The projection lens 32 is configured as a plano-convex aspheric lens having a convex front surface and a flat rear surface, and is supported by a light control member 38.

  The light emitting element 34 is a white light emitting diode, and is arranged vertically upward on the optical axis Ax while being supported by the metal support plate 40. The metal support plate 40 is fixed to the unit mounting portion 20 </ b> B of the metal bracket 20. As a result, even if the light emitting element 34 generates heat due to the lighting of the lamp unit 30, this heat is quickly moved to the metal bracket 20 via the metal support plate 40 by heat conduction.

  The reflector 36 is configured to reflect the light from the light emitting element 34 forward and toward the optical axis Ax so as to substantially converge near the rear focal point F of the projection lens 32, and in the pair of right and left brackets thereof. The unit support 20B is fixed with screws.

  The light control member 38 is formed such that its upper surface 38a extends rearward from the rear focal point F of the projection lens 32, and its front end edge is substantially arcuate along the focal plane of the rear focal point F of the projection lens 32. Is formed. The upper surface 38a is subjected to a reflection surface treatment, thereby preventing a part of the reflected light from the reflection surface 36a of the reflector 36 from going straight and reflecting it upward. The light control member 38 is screwed and fixed to the unit support portion 20B together with the reflector 36 in a pair of left and right brackets.

  A rectangular opening 12 c is formed in the rear wall 12 b of the lamp body 12, and a metal back cover 24 is attached to the opening 12 c via a gasket 26.

  The metal back cover 24 is formed of a die cast product (for example, an aluminum die cast product), and a vertical panel portion 24A disposed so as to close the opening 12c from the front side at the outer peripheral edge portion, and the vertical panel portion 24A. On the front surface of the panel portion 24A, nine second fins 24B formed at equal intervals in the vertical direction so as to extend forward along the horizontal plane, and an opening portion on the rear surface of the vertical panel portion 24A. It consists of sixteen third fins 24C that are formed at equal intervals in the horizontal direction so as to extend rearward through 12c along the vertical plane.

  The nine second fins 24B are all formed in the same shape, and the interval between the nine second fins 24B is set to the same value as the interval between the first fins 20C. Yes. The metal back cover 24 is attached to the opening 12c in a state where the second fins 24B are arranged so as to be alternately and non-contactingly superposed on the first fins 20C in the vertical direction. Yes. At that time, the first fins 20C are inserted at the center positions in the vertical direction between the second fins 24B.

  The front end surface (that is, the rear end surface) 20Ba of each second fin 24B is chamfered at both left and right end portions thereof, so that when the metal bracket 20 is turned, the vertical panel portion 20A is moved to each of the second fin portions 24B. Interference with the fins 24B is prevented in advance.

  FIG. 4 is a view showing the metal bracket 20 and the five lamp units 30 rotated in the horizontal direction by driving the swivel actuator 50, and the position indicated by the solid line in the drawing is directed to the right. This is the position when turning to the maximum angle, and the position indicated by the two-dot chain line in the figure is the position when turning to the maximum angle leftward.

  FIG. 5 is a view showing the metal bracket 20 and the five lamp units 30 tilted in the vertical direction by driving the leveling actuator 56, and the position indicated by the solid line in FIG. The position when tilted to the maximum angle in the direction, and the position indicated by a two-dot chain line in the figure is the position when tilted upward to the maximum angle.

  As shown in the figure, even when the metal bracket 20 is tilted up to the maximum angle in the vertical direction, there is a slight gap between each first fin 20C and each second fin 24B of the metal back cover 24. A gap is formed.

  FIG. 6 is a perspective view of a low beam light distribution pattern PL formed on a virtual vertical screen disposed at a position 25 m ahead of the lamp by light irradiated forward from the vehicle headlamp 10 according to the present embodiment. FIG.

  As shown by the solid line in FIG. 2, the low beam light distribution pattern PL is a left light distribution pattern, and is a combined distribution of five light distribution patterns formed by light irradiation from the five lamp units 30. It is formed as a light pattern.

  This low beam light distribution pattern PL has a horizontal cut-off line CL1 and an oblique cut-off line CL2 rising from the horizontal cut-off line CL1 at a predetermined angle (for example, 15 °) at the upper end edge. The position of the elbow point E that is the intersection is set to a position that is about 0.5 to 0.6 ° below HV that is the vanishing point in the front direction of the lamp. In the low beam light distribution pattern PL, a hot zone HZ which is a high luminous intensity region is formed so as to surround the elbow point E.

  In this low beam light distribution pattern PL, the elbow point E is located about 0.5 to 0.6 ° below HV because the optical axis Ax of each lamp unit 30 extends in the vehicle longitudinal direction. As described above, the optical axis adjustment is performed through the metal frame 22 by operating each aiming screw 52, as described above. The metal bracket 20 is tilted in the vertical direction and the horizontal direction.

  When the five lamp units 30 are turned about the vertical axis Ax1 by driving the swivel actuator 50, the low beam light distribution pattern PL is formed at the position where the light beam distribution pattern PL is formed as shown by a two-dot chain line in FIG. Is greatly displaced leftward or rightward. As a result, when the vehicle turns on a curved road or makes a right or left turn at an intersection, the front road surface in the vehicle traveling direction is illuminated brightly.

  In addition, the low beam light distribution pattern PL is formed such that the vehicle body is inclined in the front-rear direction with respect to the traveling road surface due to acceleration / deceleration of the vehicle and the formation position thereof is upward or downward as indicated by a broken line in FIG. Even when displaced, the five lamp units 30 are tilted in the vertical direction by driving the leveling actuator 56, and the formation position of the low beam light distribution pattern PL is maintained at the position indicated by the solid line in FIG. It is supposed to be.

  As described above in detail, the vehicle headlamp 10 according to the present embodiment is provided in the lamp chamber formed by the lamp body 12 and the translucent cover 14 attached to the front end opening 12a of the lamp body 12. The five lamp units 30 having the light emitting element 34 as a light source and the metal brackets 20 that support the five lamp units 30 are accommodated, and the metal brackets 20 can be swiveled in the horizontal direction with respect to the lamp body 12. However, on the rear surface of the metal bracket 20, eight first fins 20 </ b> C extending rearward along a horizontal plane are formed at equal intervals in the vertical direction. In addition, an opening 12c is formed in the rear wall 12b of the lamp body 12, and a metal back cover 24 is attached to the opening 12c. Furthermore, on the front surface of the metal back cover 24, nine second fins 24B extending along a horizontal plane toward the front are vertically arranged at intervals equal to the intervals between the first fins 20C in the vertical direction. Are formed at regular intervals, and on the rear surface of the metal back cover 24, 16 third fins 24C extending rearward are formed. Since the mounting to the opening 12c is performed in a state where the second fins 24B are alternately arranged in a non-contact manner with respect to the first fins 20C, the following effects can be obtained. it can.

  That is, when each lamp unit 30 is turned on, the heat generated in the light emitting element 34 moves to the metal bracket 20 having a large heat capacity via the metal support plate 40 by a heat conduction action. Further, due to the heat radiation action, the metal back cover 24 also moves close to the metal bracket 20 and diffuses from the metal back cover 24 to the space outside the lamp room.

  At that time, the mounting of the metal back cover 24 to the opening 12c is performed in a state in which the second fins 24B are arranged so as to be alternately and non-contactingly superimposed on the first fins 20C. Despite the presence of an air layer between the two, the heat transfer efficiency can be increased, whereby the heat of the metal bracket 20 can be efficiently transferred to the metal back cover 24. Since the metal back cover 24 is formed with 16 third fins 24C extending rearward, the heat transferred to the metal back cover 24 is efficiently dissipated to the space outside the lamp chamber. It can be carried out.

  Further, since the first fins 20C and the second fins 24B that are alternately and non-contactly overlapped with each other are formed so as to extend along the horizontal plane, the metal bracket 20 pivots in the horizontal direction. Even so, the first fin 20C and the second fin 24B of the metal back cover 24 can be prevented from interfering with each other.

  Furthermore, since the metal back cover 24 is maintained in a non-contact state with respect to the metal bracket 20 as described above, the lamp body 12 of the metal back cover 24 even if the metal bracket 20 is swung in the horizontal direction. It is possible to prevent any influence on the mounting state. For this reason, it becomes possible to ensure the waterproof function of a lamp enough, and it can prevent beforehand that a lamp structure becomes complicated by this.

  As described above, the vehicle headlamp 10 according to the present embodiment includes the five lamp units 30 having the light emitting element 34 as a light source and has a swivel function, but the lamp configuration is complicated. The heat dissipation performance can be ensured without making it.

  And thereby, the temperature rise of the light emitting element 34 of each lamp unit 30 can be effectively suppressed, and the light source luminous flux can be effectively suppressed from decreasing or the emission color from being changed.

  In particular, in the present embodiment, the third fins 24C formed on the rear surface of the metal back cover 24 are formed so as to extend along the vertical surface and are arranged at equal intervals in the horizontal direction. Therefore, an updraft can be generated in the space between the third fins 24C, whereby heat dissipation from the third fins 24C can be performed very efficiently.

  Further, the vehicle headlamp 10 according to the present embodiment has a leveling function, and in order to realize this, the metal bracket 20 is supported in a manner that it can tilt in the vertical direction with respect to the lamp body 12. However, since the first fins 20C and the second fins 24B are arranged at intervals that do not interfere with each other within the vertical tilt angle range of the metal bracket 20, the metal brackets can be used even during leveling. It is possible to prevent the first fin 20C of 20 and the second fin 24B of the metal back cover 24 from interfering with each other.

  At this time, in the present embodiment, the first fins 20C are formed in the same shape, and the interval between the first fins 20C is 3 to 3 times the thickness of the base end portion of the first fin 20C. The value is set to about 5 times, and each second fin 24B has the same configuration as this, so that interference between the first fin 20C and the second fin 24B during leveling can be prevented. It is possible to achieve coexistence with ensuring heat transfer efficiency by heat radiation action between the two.

  In addition, in the said embodiment, if it is set as the structure by which the black alumite process was given to the surface of each 1st fin 20C and each 2nd fin 24B, the heat transfer efficiency between both can be improved further. If each 3rd fin 24C is set as the structure by which the black alumite process was given to the surface, the heat dissipation efficiency can be improved further.

  In the above embodiment, the metal back cover 24 has a structure for passing wiring extending from the light emitting element 34 of each lamp unit 30 (for example, a wiring insertion hole is formed in the metal back cover 24, and this wiring It is also possible to provide a structure in which a rubber bush is attached to the insertion hole.

  In the above embodiment, there has been described the case where the number of the first fins 20C is 8, the number of the second fins 24B is 9, and the number of the third fins 24C is 16, but the number of these fins is set to other values. Of course it is also possible.

  In the above embodiment, in order to prevent interference between the first fin 20C of the metal bracket 20 and the second fin 24B of the metal back cover 24 during leveling, the distance between the first fins 20C and Although it has been described that the interval between the second fins 24B is set to a value of about 3 to 5 times the thickness of the base end of each first fin 20C and each second fin 24B, the leveling function When is not given, the interval can be set to a narrower value.

  Further, in the above-described embodiment, the first fins 20C and the second fins 24B are described as being formed at equal intervals. However, the intervals are set at unequal intervals (for example, metal It is also possible to set the interval so that the interval gradually decreases from the lower end to the upper end of the bracket 20 and the metal back cover 24).

  Moreover, in the said embodiment, although demonstrated about what was formed at equal intervals about each 3rd fin 24C, the space | interval can also be set to an unequal interval.

  By the way, in the said embodiment, although demonstrated that the metal bracket 20 was supported in the aspect which can be rotated in the horizontal direction with respect to the lamp body 12, the structure which the metal bracket 20 does not perform such a rotation. (That is, a configuration not having a swivel function) is also possible. Even in this case, the heat transfer efficiency between the first fins 20C and the second fins 24B can be increased by arranging the first fins 20C and the second fins 24B alternately and in a non-contact manner.

  Further, when the metal bracket 20 is configured not to turn in the horizontal direction with respect to the lamp body 12, the first fins 20C and the second fins 24B extend along the vertical plane. Even in this case, the first fins 20C and the second fins 24B are arranged in a state where they are alternately stacked in a non-contact manner in the horizontal direction. The heat transfer efficiency can be increased. And when such a structure is employ | adopted, it becomes possible to set the tolerance | permissible_range of the inclination angle of the vertical direction of the metal bracket 20 at the time of leveling large enough.

  In the above embodiment, the five lamp units 30 are described as being provided in a substantially regular pentagonal arrangement, but it is of course possible to employ other numbers or arrangements.

  In the above-described embodiment, the five lamp units 30 have been described as being configured as projector-type lamp units, but it is of course possible to employ other lamp configurations.

Side sectional view which shows the vehicle headlamp which concerns on one Embodiment of this invention II-II sectional view of Fig. 1 Sectional view along line III-III in Fig. 1 The same figure as FIG. 2 which shows the said vehicle headlamp in the state which rotated the metal bracket and five lamp units in the horizontal direction The same figure as FIG. 1 which shows the said vehicle headlamp in the state which inclined the metal bracket and five lamp units in the up-down direction The figure which shows perspectively the light distribution pattern for low beams formed on the virtual vertical screen arrange | positioned in the position of the lamp front 25m by the light irradiation from the said vehicle headlamp

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle headlamp 12 Lamp body 12a Front end opening part 12b Rear surface wall 12c Opening part 14 Translucent cover 20 Metal bracket 20a Pin 20b Boss 20A Vertical panel part 20B Unit attachment part 20C 1st fin 20Ca Front end surface 22 Metal frame 22a boss 24 metal back cover 24A vertical panel portion 24B second fin 24Ba tip surface 24C third fin 30 lamp unit 32 projection lens 34 light emitting element 36 reflector 36a reflecting surface 38 light control member 38a upper surface 40 metal support plate 50 for swivel Actuator 50a Upward output shaft 52 Aiming screw 54 Aiming nut 56 Leveling actuator 56a Output shaft Ax Optical axis Ax1 Vertical axis CL1 Horizontal cut-off line CL2 Diagonal bracket A light distribution pattern for offline E elbow point F rear focal HZ hot zone PL low-beam

Claims (4)

In a lamp chamber formed by a lamp body and a translucent cover attached to the front end opening of the lamp body, a plurality of lamp units each having a light emitting element as a light source and a metal made to support the plurality of lamp units from the rear side In the vehicle headlamp in which the bracket is housed and the metal bracket is supported to be tiltable with respect to the lamp body,
A plurality of first fins extending in a predetermined direction toward the rear are formed on the rear surface of the metal bracket at a predetermined interval in a direction orthogonal to the predetermined direction.
An opening is formed in the rear wall of the lamp body, and a metal back cover is attached to the opening.
A plurality of second fins extending in the predetermined direction toward the front are formed on the front surface of the metal back cover at predetermined intervals in a direction orthogonal to the predetermined direction, and the rear surface of the metal back cover A plurality of third fins extending rearward are formed,
The mounting of the metal back cover to the opening is performed in a state where the second fins are arranged so as to be alternately and non-contactingly superposed on the first fins. Vehicle headlamp. The support of the metal bracket to the lamp body is performed in such a manner that it can pivot in the horizontal direction,
The vehicle headlamp according to claim 1, wherein the predetermined direction is set in a substantially horizontal direction. The metal bracket is supported in a manner capable of tilting up and down with respect to the lamp body,
3. The vehicle according to claim 2, wherein the first fins and the second fins are arranged at intervals that do not interfere with each other within a tilt angle range in the vertical direction of the metal bracket. Headlight.   4. The vehicle according to claim 1, wherein the third fins are formed so as to extend along a substantially vertical plane and are arranged at a predetermined interval in the horizontal direction. Headlight.

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