WO2023068059A1 - 灯具 - Google Patents

灯具 Download PDF

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Publication number
WO2023068059A1
WO2023068059A1 PCT/JP2022/037339 JP2022037339W WO2023068059A1 WO 2023068059 A1 WO2023068059 A1 WO 2023068059A1 JP 2022037339 W JP2022037339 W JP 2022037339W WO 2023068059 A1 WO2023068059 A1 WO 2023068059A1
Authority
WO
WIPO (PCT)
Prior art keywords
fan
light source
reference line
impeller
extending
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/037339
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
快之 中西
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koito Manufacturing Co Ltd
Original Assignee
Koito Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koito Manufacturing Co Ltd filed Critical Koito Manufacturing Co Ltd
Priority to JP2023554449A priority Critical patent/JPWO2023068059A1/ja
Publication of WO2023068059A1 publication Critical patent/WO2023068059A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/42—Forced cooling
    • F21S45/43—Forced cooling using gas
    • F21S45/435—Forced cooling using gas circulating the gas within a closed system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/49—Attachment of the cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
    • F21W2102/14—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having vertical cut-off lines; specially adapted for adaptive high beams, i.e. wherein the beam is broader but avoids glaring other road users
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
    • F21W2102/155—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having inclined and horizontal cutoff lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to lamps.
  • Patent Document 1 A lamp that cools a light source is known, and Patent Document 1 below discloses such a lamp.
  • the lamp of Patent Document 1 includes a substrate on which a light source is mounted, a heat sink on which the substrate is arranged, and a fan that blows air to the heat sink to cool the heat sink. Heat generated by the light source is transferred to the heat sink through the substrate and emitted from the heat sink. This cools the light source.
  • the light fixture cools the light source by dissipating heat from the heat sink, but there is a demand to improve the cooling efficiency of the light source.
  • an object of the present invention is to provide a lamp that can improve the cooling efficiency of the light source.
  • the lamp according to the first aspect of the present invention comprises a substrate on which a light source is mounted, a base plate on which the substrate is arranged, and a back surface of the base plate opposite to the substrate side, which is spaced apart from each other.
  • a heat sink including a plurality of radiating fins arranged in parallel with a space therebetween and mounting bosses provided on the back surface; an impeller for sending air to gaps between the heat radiating fins; and a fan provided on the side of the impeller, supporting the impeller, and including a support member attached to the mounting boss,
  • the fan When the fan is viewed from the rear, at least a portion of the first reference line passes through the rotating shaft of the impeller and extends in the extending direction of the heat radiating fins.
  • the second reference line extending in the direction is.
  • the air sent from the impeller to the gaps between the heat dissipating fins adjacent to each other hits the back surface of the base plate and flows through the gaps along the heat dissipating fins. Most of the wind flowing through the gap tends to flow toward one end of the gap due to the influence of the vortex of the airflow caused by the rotation of the impeller.
  • at least a part of the mounting boss is provided in a region on the rear side in the rotational direction of the impeller between regions adjacent to each other in the extending direction of the four regions when the fan is viewed from the rear. .
  • the mounting boss is provided on the side of the impeller in the rear region and is provided at a position that does not block the wind.
  • the mounting bosses are provided in this way, the mounting bosses are provided in the front side region in the rotation direction of the impeller between the regions adjacent to each other in the extending direction of the heat radiating fins among the four regions. is difficult to block the wind. For this reason, the wind easily flows and is easily blown off to the side of the heat radiating fins, and the heat radiating fins can be easily cooled. Therefore, according to the above configuration, the heat generated by the light source can be easily transferred to the radiation fins, and the cooling efficiency of the light source can be improved.
  • a lamp according to a second aspect of the present invention comprises a substrate on which a light source is mounted, a base plate on which the substrate is arranged, and a back surface of the base plate opposite to the substrate side.
  • a heat sink including a plurality of radiating fins arranged in parallel with a space therebetween;
  • the structure is located in a region other than the leeward side of the wind that has passed through the gap in the extending direction of the heat radiating fins.
  • the structure is less likely to block the wind that has passed through the gap, and the wind is more likely to blow out to the side of the heat dissipation fins. Cooling can be facilitated. Therefore, according to the above configuration, the heat generated by the light source can be easily transferred to the radiation fins, and the cooling efficiency of the light source can be improved.
  • the structure may be arranged apart from the heat radiation fins.
  • heat from the heat radiating fins can be less likely to be transmitted to the structure, and deformation of the structure due to the heat can be suppressed.
  • the structure may include a conductive member that supplies power to the fan.
  • the light source has a first reference line extending in the extension direction passing through the rotation axis of the fan when the fan is viewed from the rear, and one of the plurality of radiation fins. It overlaps at least part of a predetermined area between the radiation fins farthest from the first reference line, and the predetermined area extends in a direction perpendicular to the first reference line passing through the first reference line and the rotation axis. of the four regions formed by the second reference line extending in the direction of the fan and the region adjacent to each other in the extending direction.
  • the heat sink further includes a mounting boss provided on the back surface
  • the fan includes an impeller
  • the fan is provided on the side of the impeller to support the impeller
  • At least a part of the mounting boss includes a support member attached to the mounting boss
  • at least a part of the mounting boss includes a first reference line extending in the extending direction through the rotation shaft of the impeller when the fan is viewed from the rear and the of four regions formed by a second reference line passing through the rotation axis and extending in a direction perpendicular to the first reference line; It may be provided in the side area.
  • the mounting boss since the support member is attached to the mounting boss, when the fan is viewed from the rear, the mounting boss is provided on the side of the impeller in the rear area, and is provided at a position that does not block the wind. be done.
  • the mounting bosses are provided in this way, the mounting bosses are provided in the front side region in the rotation direction of the impeller between the regions adjacent to each other in the extending direction of the heat radiating fins among the four regions. is difficult to block the wind. For this reason, the wind easily flows and is easily blown off to the side of the heat radiating fins, and the heat radiating fins can be easily cooled. Therefore, according to the above configuration, the heat generated by the light source can be easily transferred to the radiation fins, and the cooling efficiency of the light source can be improved.
  • At least a part of the mounting boss is located on the rear side in the rotational direction of the impeller in the areas adjacent to each other in the extending direction among the four areas. may be provided in each of the regions of
  • the fan since the fan is attached to the heat sink at two points, the swinging of the fan due to rotation of the impeller can be suppressed compared to the case where the fan is attached to the heat sink at one point. Suppressing the swinging of the fan makes it easier for the air from the impeller to flow through the gap, and makes it easier to cool the radiating fins, compared to when the swinging of the fan is not suppressed.
  • one of the mounting bosses does not have to overlap the other of the mounting bosses along the extending direction.
  • the air flows more easily and blows out to the side of the heat radiating fins, making it easier to cool the heat radiating fins. obtain. Therefore, the heat generated by the light source can be easily transferred to the radiation fins, and the cooling efficiency of the light source can be improved.
  • one of the mounting bosses may overlap at least part of the other of the mounting bosses along the extending direction.
  • the light source when the fan is viewed from the rear, is the farthest from the first reference line among the first reference line and the plurality of radiation fins. It may overlap with at least part of a predetermined region between the heat radiating fins, and the predetermined region may overlap with a region on the front side in the rotational direction of the impeller between regions adjacent in the extending direction.
  • the predetermined area between the first reference line and the radiation fins farthest from the first reference line in the area on the front side is more easily cooled than the area outside the predetermined area. According to the above configuration, the heat generated by the light source can be more easily conducted to the radiation fins, and the cooling efficiency of the light source can be improved, compared to the case where the light source overlaps the outer region.
  • FIG. 3 is an exploded perspective view of the lamp unit as seen obliquely from the front and above;
  • FIG. 4 is an exploded perspective view of the lamp unit as viewed obliquely from below;
  • 4 is a vertical sectional view of the lamp unit;
  • FIG. It is a perspective view which looks at a heat sink from front diagonally upper direction.
  • It is a front view which shows a board
  • FIG. 3 is an exploded perspective view of the lamp unit as seen obliquely from the front and above;
  • FIG. 4 is an exploded perspective view of the lamp unit as viewed obliquely from below;
  • 4 is a vertical sectional view of the lamp unit;
  • FIG. It is a perspective view which looks at a heat sink from
  • FIG. 5 is an enlarged view of a portion including a light distribution forming portion in FIG. 4; FIG. It is a back view of a heat sink.
  • FIG. 5 is an enlarged view of part of FIG. 4 schematically showing an example of optical paths of light emitted from a first light source and light emitted from a second light source; It is a figure which shows the light distribution pattern of the low beam in this embodiment. It is a figure which shows the light distribution pattern of the high beam in this embodiment. It is a back view of the heat sink in a modification.
  • FIG. 1 is a diagram schematically showing the lamp in this embodiment, and is a diagram schematically showing a cross section of the lamp in the vertical direction.
  • the lamp of this embodiment is a vehicle headlamp for an automobile.
  • Vehicle headlamps are generally provided in front of a vehicle in left and right directions.
  • "right” means the right side in the forward direction of the vehicle
  • "left” means the left side in the forward direction of the vehicle.
  • Each of the left and right vehicle headlamps has the same configuration, except that the shape is generally symmetrical in the left-right direction. Therefore, one vehicle headlamp will be described below.
  • the vehicle headlamp 1 of this embodiment mainly includes a housing 10 and a lamp unit LU. 1 is a side view of the vehicle headlamp 1, and FIG. 1 shows a cross section of the housing 10 for easy understanding.
  • the housing 10 has a lamp housing 11 and a front cover 12 having optical transparency.
  • the front of the lamp housing 11 is open, and a front cover 12 is fixed to the lamp housing 11 so as to close the opening.
  • a space formed by the lamp housing 11 and the front cover 12 is a lamp chamber R, and the lamp unit LU is accommodated in the lamp chamber R.
  • FIG. 2 is an exploded perspective view of the lamp unit LU seen obliquely from the front and above.
  • FIG. 3 is an exploded perspective view of the lighting unit LU as seen obliquely from below.
  • FIG. 4 is a vertical sectional view of the lamp unit LU.
  • the lighting unit LU of this embodiment includes a heat sink 20, a fan 30 that is an axial fan, a substrate 40, a reflector unit 50, a projection lens 60, a holder 70, is provided as the main configuration.
  • 4 is a vertical cross-sectional view of the lamp unit LU along the optical axis of the projection lens 60, which will be described later, and the illustration of the fan 30 is omitted in FIG.
  • FIG. 5 is a perspective view of the heat sink 20 viewed obliquely from the front and above.
  • the heat sink 20 is made of a material with excellent heat dissipation, such as metal.
  • the heat sink 20 of this embodiment includes a base plate 21 on which a substrate 40 is arranged, a plurality of radiation fins 22, a plurality of mounting bosses 23a and 23b, and a peripheral wall portion 24. Provided as a main component.
  • the base plate 21 is a plate-like member having a front surface located on the front side and a back surface located on the rear side, and has an inclined portion 25 that is inclined rearwardly upward.
  • the inclined portion 25 is provided with a pedestal 25a projecting forward, and an end surface 25s of the pedestal 25a is a flat surface that is upwardly inclined rearward.
  • a substrate 40 is arranged on the end face 25s.
  • Protrusions 26 protruding forward are provided on both left and right sides of the base 25a.
  • Pins 27 projecting forward are provided on the right and left sides of the base plate 21 relative to the pedestal 25a.
  • the plurality of heat radiation fins 22, mounting bosses 23a and 23b, and peripheral wall portion 24 are arranged on the back surface of the base plate 21 opposite to the substrate 40 side, extend rearward, and are integrally formed with the base plate 21. .
  • the fan 30 is arranged behind the plurality of radiating fins 22 and fixed to the mounting bosses 23a and 23b. The air blown by the fan 30 cools the heat sink 20 .
  • the rear side of the heat sink 20 on which the plurality of radiation fins 22, mounting bosses 23a and 23b, the peripheral wall portion 24, and the fan 30 are arranged will be described later.
  • the substrate 40 is a plate-like member made of metal, for example, and is arranged on the end face 25s of the base 25a of the heat sink 20, as described above.
  • FIG. 6 is a front view schematically showing the substrate 40.
  • the outer shape of the substrate 40 is generally a symmetrical rectangular shape, and the substrate 40 has a pair of concave portions 45 in which left and right side surfaces 40sf facing each other are respectively recessed.
  • the concave portion 45 has a substantially rectangular shape.
  • the side surface 40sf of the substrate 40 that defines the recess 45 includes a pair of straight portions 45S extending in the left-right direction and facing each other, a bottom portion 45B that is the tip of the recess and extends in the vertical direction, the straight portion 45S and the bottom portion. and a corner portion 45R connecting with 45B.
  • the protrusions 26 of the heat sink 20 are inserted into the respective recesses 45 .
  • the projection part 26 is shown by FIG.
  • the vertical movement of the substrate 40 along the end surface 25 s is restricted by the pair of linear portions 45 S of the recess 45 and the outer peripheral surface of the protrusion 26 .
  • the bottom 45B of one recess 45 and the outer peripheral surface of one protrusion 26, and the bottom 45B of the other recess 45 and the outer peripheral surface of the other protrusion 26 allow the substrate 40 to extend in the horizontal direction along the end face 25s. Movement is restricted. Thus, the movement of the substrate 40 along the end surface 25 s is restricted by the concave portion 45 and the protrusion 26 , and the substrate 40 is positioned with respect to the heat sink 20 .
  • the shape of the recess 45 is not particularly limited.
  • the protrusion 26 may be press-fitted into the recess 45 .
  • a first light source 41, a second light source 42, an integrated circuit 43, and a connector 44 are mounted on the front surface 40f of the substrate 40.
  • the first light source 41 emits light forming a low-beam light distribution pattern from a planar emission surface.
  • the second light source 42 emits light that forms a high beam light distribution pattern together with the light emitted from the first light source 41 from a planar emission surface.
  • the first light source 41 and the second light source 42 are LED arrays composed of a plurality of LEDs (Light Emitting Diodes) arranged in the horizontal direction, and are arranged inside the bottom portion 45B of the concave portion 45 .
  • the second light source 42 is positioned below the first light source 41 and overlaps the recess 45 in the left-right direction, which is the direction in which the plurality of LEDs are arranged.
  • the integrated circuit 43 is arranged below the second light source 42 and the connector 44 is arranged below the integrated circuit 43 .
  • a circuit (not shown) is provided on the substrate 40, and the circuit connects the connector 44 and the first light source 41, the connector 44 and the integrated circuit 43, and the integrated circuit 43 and the second light source 42, respectively.
  • Power is supplied to the connector 44 from a power supply unit (not shown). Therefore, power is supplied from the connector 44 to the first light source 41 , and power is supplied from the connector 44 to the second light source 42 via the integrated circuit 43 .
  • the integrated circuit 43 includes a plurality of switch elements to individually adjust the power supplied to each LED of the second light source 42 .
  • the integrated circuit 43 is not particularly limited as long as it can adjust the power supplied to at least one of the first light source 41 and the second light source 42 . Also, the arrangement of the integrated circuit 43 and the connector 44 is not particularly limited. Also, the integrated circuit 43 may not be mounted on the substrate 40, in which case the connector 44 and the second light source 42 are connected by a circuit.
  • the portion of the substrate 40 where the first light source 41, the second light source 42, and the integrated circuit 43 are mounted overlaps the end face 25s. Further, as described above, since the end surface 25s is tilted upward and rearward, the substrate 40 is also tilted, and the front surface 40f of the substrate 40 is tilted forward and upward.
  • a normal 41L to the exit surface of the first light source 41 and a normal 42L to the exit surface of the second light source 42 are substantially perpendicular to the front surface 40f of the substrate 40 . Therefore, the perpendicular 41L and the perpendicular 42L face obliquely forward and upward.
  • a perpendicular line 41L and a perpendicular line 42L shown in FIG. 4 are the same as a straight line that passes through the center of the emission surface, is parallel to the emission direction of the light with the highest intensity among the light emitted from the light source, and passes through the portion of the emission surface from which the light is emitted. is.
  • FIG. 7 is a front view of the state in which the reflector unit 50 is attached to the heat sink 20, viewed from the front side, along the optical axis of the projection lens 60, which will be described later.
  • the reflector unit 50 is arranged in front of the substrate 40 and the substrate 40 is sandwiched between the reflector unit 50 and the heat sink 20 .
  • the reflector unit 50 of this embodiment includes a light distribution forming portion 50a and a cover portion 50b connected to the left and right sides and the lower side of the light distribution forming portion 50a. It is formed.
  • the light distribution forming portion 50a is surrounded by a dashed line.
  • the reflector unit 50 is fixed to the heat sink 20 by fixing the cover portion 50 b to the heat sink 20 with screws 80 .
  • the material forming the reflector unit 50 include plated metal, and the reflector unit 50 is formed by, for example, cutting and plating a metal member obtained by casting.
  • the light distribution forming portion 50a of this embodiment includes a first reflector 51, a pair of second reflectors 52a and 52b, a pair of upper side reflectors 53a and 53b, and a pair of lower side reflectors 53a and 53b. It has reflectors 54a and 54b as a main configuration.
  • the first reflector 51 is arranged between the first light source 41 and the second light source 42 and extends in the front-rear direction.
  • the first reflector 51 has a tapered shape toward a front end 51e, and upper and lower surfaces of the first reflector 51 are reflecting surfaces 51ur and 51dr that reflect light.
  • the upper reflecting surface 51ur which is the upper surface
  • the lower reflective surface 51dr which is the lower surface, is positioned above the normal line 42L of the second light source 42 and curves concavely upward.
  • the front end 51e of the first reflector 51 has a shape that matches the cutoff line of a low beam light distribution pattern, which will be described later, and is gradually recessed rearward from the left and right ends toward the center.
  • the vertical line 41L of the first light source 41 and the vertical line 42L of the second light source 42 are directed obliquely forward and upward. 1 approach the reflector 51;
  • One second reflector 52a is arranged above the first reflector 51 and has a reflecting surface 52ar on the first reflector 51 side.
  • the second reflector 52a of this embodiment is a plate-like member, and the side surface of the plate-like member is the reflecting surface 52ar.
  • the reflecting surface 52ar and the reflecting surface 51ur on the upper side of the first reflector 51 extend along the parallel direction of the plurality of LEDs that constitute the first light source 41, and are arranged so as to sandwich the plurality of LEDs from above and below. A pair of reflectors.
  • the other second reflector 52b is arranged below the first reflector 51 and has a reflecting surface 52br on the first reflector 51 side.
  • the second reflector 52b of this embodiment is a plate-like member, and one main surface of the plate-like member is the reflecting surface 52br.
  • the reflecting surface 52br and the reflecting surface 51dr on the lower side of the first reflector 51 extend along the parallel direction of the plurality of LEDs constituting the second light source 42, and are arranged so as to sandwich the plurality of LEDs from above and below. a pair of reflectors that
  • One upper side reflector 53a is positioned in the space sandwiched between the upper reflecting surface 51ur of the first reflector 51 and the reflecting surface 52ar of the second reflector 52a. formed at one end of the The other upper side reflector 53b is formed at the other end of the space.
  • the pair of upper side reflectors 53a and 53b are formed such that the distance between them increases from the rear toward the front.
  • An opening 55 surrounded by the pair of upper side reflectors 53a and 53b, the first reflector 51, and the second reflector 52a is formed in the light distribution forming portion 50a, and the emission surface 41s of the first light source 41 is Overlaps the opening 55 .
  • reference numerals are given to one first light source 41 and the emission surface 41s, and the reference numerals for the others are omitted.
  • One of the lower side reflectors 54a is located in the space sandwiched between the lower reflecting surface 51dr of the first reflector 51 and the reflecting surface 52br of the second reflector 52b. It is formed at one end in the parallel direction.
  • the other lower side reflector 54b is formed at the other end of the space.
  • the pair of lower side reflectors 54a and 54b are formed such that the distance between them increases from the rear toward the front.
  • An opening 56 surrounded by the pair of lower side reflectors 54a and 54b, the first reflector 51, and the second reflector 52b is formed in the light distribution forming portion 50a, and the emission surface 42s of the second light source 42 is overlaps with the opening 56 at .
  • the opening 56 and the opening 55 penetrate from a flat facing surface 50as of the light distribution forming portion 50a facing substantially parallel to the substrate 40 to the surface opposite to the substrate 40 side. Note that the facing surface 50as may not be flat.
  • through holes 57 are provided on the left and right sides of the cover portion 50b of the present embodiment, and the pins 27 of the heat sink 20 are inserted into the through holes 57.
  • the reflector unit 50 can be positioned with respect to the heat sink 20 by the peripheral surface defining the through hole 57 and the pin 27 . 4
  • the cover portion 50b overlaps the integrated circuit 43 and the connector 44 in the direction perpendicular to the front surface 40f of the substrate 40.
  • the cover portion 50 b covers the integrated circuit 43 and the connector 44 mounted on the substrate 40 . Further, as shown in FIG.
  • the light distribution forming portion 50a and the cover portion 50b are provided with a plurality of ribs 58 projecting rearward.
  • the tip of the rib 58 contacts the front surface 40 f of the substrate 40 , and the substrate 40 is pressed against the heat sink 20 by the reflector unit 50 and fixed to the heat sink 20 .
  • portions 46a, 46b, 46c, and 46d where the reflector unit 50 presses the substrate 40 are indicated by diagonal hatching.
  • the reflector unit 50 presses four portions 46a, 46b, 46c and 46d, the portions 46a and 46b being positioned outside the bottom portion 45B of one of the recessed portions 45, and the portions 46c and 46d pressing the other. is located outside the bottom portion 45B of the recessed portion 45 of the . Therefore, the reflector unit 50 presses the portion of the substrate 40 outside the bottom portion 45B of each concave portion 45 .
  • the parts 46a and 46b are positioned above and below one recess 45 as a reference, and sandwich this one recess 45 in the direction along the side surface 40sf.
  • the parts 46c and 46d are located above and below the other recess 45, and sandwich the other recess 45 in the direction along the side surface 40sf. Therefore, the reflector unit 50 presses both sides of each recess 45 in the substrate 40 . Also, the external shapes of the parts 46a, 46b, 46c, and 46d are generally rectangular, but are not particularly limited.
  • the projection lens 60 is a lens that changes the divergence angle of transmitted light, and is arranged in front of the reflector unit 50 .
  • the projection lens 60 is a biconvex aspherical lens having an outer shape elongated in the left-right direction and having a substantially oval track shape.
  • a flange portion 61 is provided that extends along the length thereof.
  • An optical axis 60 c of the projection lens 60 extends in the front-rear direction, intersects the first reflector 51 , and passes between the first light source 41 and the second light source 42 .
  • the rear focal point 60f of the projection lens 60 is located near the front end 51e between the front end 51e of the first reflector 51 and the projection lens 60. is 10 mm or less. Note that the focal point 60f may be positioned at the front end 51e or may overlap the first reflector 51.
  • FIG. Examples of the material forming the projection lens 60 include resin, glass, and the like.
  • the holder 70 of this embodiment includes a cylindrical support portion 71 extending in the front-rear direction and a pair of legs extending rearward from the left and right sides of the rear end of the support portion 71. 72.
  • a plurality of pedestals 73 projecting forward are provided at the front end of the support portion 71, and the flange portion 61 of the projection lens 60 is fixed to the pedestals 73 by, for example, ultrasonic welding or laser welding.
  • the legs 72 are fixed to the heat sink 20 by screws 81 and the projection lens 60 is fixed to the heat sink 20 via the holder 70 .
  • a resin such as opaque polycarbonate can be used.
  • FIG. 10 is a back view of the heat sink 20.
  • FIG. A plurality of radiation fins 22 of the heat sink 20 are arranged in parallel with a space therebetween and extend in the left-right direction.
  • FIG. 10 for ease of viewing, only one of each of the radiating fins 22 and the gaps 500 between the radiating fins 22 adjacent to each other is labeled.
  • the uppermost radiating fin is designated as radiating fin 22a
  • the lowermost radiating fin is designated as radiating fin 22b.
  • the radiation fins 22 refer to the radiation fins 22a, 22b and the radiation fins located between the radiation fins 22a, 22b.
  • the left and right sides of the heat radiation fins 22 and the upper side of the heat radiation fins 22a are surrounded by the peripheral wall portion 24.
  • the peripheral wall portion 24 is a frame surrounding the radiation fins 22 as described above and is separated from the radiation fins 22 .
  • the left and right walls of the peripheral wall portion 24 are shorter than the radiating fins 22 and the upper wall is longer than the radiating fins 22 in the front-rear direction.
  • a fan 30 is provided behind the plurality of heat radiation fins 22.
  • the fan 30 mainly includes an impeller 31 provided on the side opposite to the base plate 21 with respect to the plurality of radiation fins 22 and a support unit 33 .
  • illustration of the impeller 31 is omitted in FIGS. 2 and 3 .
  • FIG. 10 is also a view of the impeller 31 viewed along the rotation axis R1.
  • Each of the impeller 31 and the support unit 33 is made of resin, for example.
  • the impeller 31 rotates around a rotation axis R1 along a direction perpendicular to the back surface of the base plate 21. Also, the impeller 31 rotates along the back surface of the base plate 21 to send air to the gaps 500 between the adjacent radiation fins 22 .
  • the impeller 31 of this embodiment rotates counterclockwise.
  • the impeller 31 is rotatably supported by the support unit 33 .
  • the support unit 33 mainly includes a base member 33a on which the impeller 31 is arranged, and a support member 33b provided on the side of the impeller 31 and the base member 33a when the fan 30 is viewed from the rear.
  • the base member 33 a is a circular plate-like member and is arranged in front of the impeller 31 .
  • the base member 33a is connected to the support member 33b via spokes 33c that are connected to the outer peripheral surface of the base member 33a and the inner peripheral surface of the support member 33b. Therefore, the support member 33b rotatably supports the impeller 31 via the base member 33a and the spokes 33c.
  • illustration of the spokes 33c is omitted in FIG.
  • the support member 33b is an outer frame that encloses the sides of the impeller 31 and the base member 33a, and is formed in a substantially square shape. In the support member 33b of the present embodiment, two substantially parallel sides of the substantially square support member 33b extend in the left-right direction.
  • the support member 33b is shorter than the heat radiating fins 22 in the horizontal direction and longer than the space between the heat radiating fins 22a and 22b in the vertical direction.
  • the front surfaces of the base member 33a and the support member 33b are in contact with the rear ends of the radiation fins 22, but may be separated from the rear ends.
  • the four corners of the support member 33b are rounded.
  • Through holes 33d are provided in the upper right and lower left corners of the four corners of the support member 33b, screws 501 are inserted into the through holes 33d, and the screws 501 are screwed into the mounting bosses 23a and 23b. Thereby, the fan 30 is attached to the heat sink 20 via the support member 33b and the attachment bosses 23a and 23b.
  • FIG. 10 the mounting bosses 23a and 23b are hidden by the fan 30 and cannot be seen, but are illustrated with broken lines for easy understanding.
  • a straight line passing through the rotation axis R1 and extending in the extending direction of the radiation fins 22 is indicated as a first reference line 503a
  • a straight line passing through the rotation axis R1 and extending in a direction orthogonal to the first reference line 503a is indicated as a first reference line 503a. It is shown as a second reference line 503b.
  • Four areas are formed by the reference lines 503a and 503b, and areas 510a, 510b, 510c, and 510d are shown as upper right, upper left, lower left, and lower right areas with respect to the rotation axis R1.
  • each region is shown slightly displaced from the reference lines 503a and 503b.
  • the regions 510a and 510b and the regions 510c and 510d are regions adjacent to each other in the extending direction of the radiation fins 22. . Further, since the impeller 31 rotates counterclockwise, the region 510a in the regions 510a and 510b and the region 510c in the regions 510c and 510d are regions on the rear side of the impeller 31 in the rotation direction.
  • the mounting bosses 23a are provided in the rear region 510a, and the mounting bosses 23b are provided in the rear region 510c.
  • mounting bosses 23a, 23b are provided in respective rear regions 510a, 510c. At least part of the mounting boss 23a should be provided in the rear area 510a, and at least part of the mounting boss 23b should be provided in the rear area 510c.
  • the support member 33b is attached to the attachment bosses 23a and 23b as described above. Therefore, when the fan 30 is viewed from the rear, the mounting bosses 23 a and 23 b are located on the sides of the impeller 31 . Further, since through holes 33d are provided in the upper right and lower left corners of the support member 33b, the mounting boss 23a overlaps the upper right corner and the mounting boss 23b overlaps the lower left corner.
  • the mounting boss 23a is located between the first reference line 503a and the radiating fin 22a farthest upward from the first reference line 503a, specifically, the gap between the radiating fin 22a and the radiating fin 22 adjacent to the radiating fin 22a. Located at 500.
  • the mounting boss 23b is located outside the heat radiating fin 22b on the side opposite to the gap 500 side.
  • the mounting bosses 23a and 23b positioned as described above do not overlap each other along the extending direction of the radiation fins 22. As shown in FIG.
  • the mounting boss 23a is connected to the heat radiating fin 22a and the heat radiating fin 22 adjacent to the heat radiating fin 22a, and the mounting boss 23b is connected to the heat radiating fin 22b.
  • the mounting bosses 23 a and 23 b may be connected to at least one of the mutually adjacent radiation fins 22 forming the gap 500 or may be separated from the radiation fins 22 .
  • the impellers in the regions 510a and 510b adjacent to each other in the extending direction of the radiating fin 22 31 is shown as a predetermined area 520a.
  • some of the LEDs of the first light source 41 overlap the predetermined area 520a.
  • At least one LED of the first light source 41 may overlap at least part of the predetermined area 520a.
  • Most of the wind flowing through the gap 500 flows toward the end side of the gap 500 overlapping the above-described region 510b under the influence of the vortex of the airflow caused by the rotation of the impeller 31 .
  • the predetermined area 520 a is cooled more easily than the area outside the predetermined area 520 a , and the heat generated by the first light source 41 overlapping the predetermined area 520 a is easily transferred to the radiation fins 22 .
  • the predetermined area 520 a is used, but even if the first light source 41 overlaps the predetermined area 520 b as described above, the heat generated by the first light source 41 is easily transmitted to the heat dissipation fins 22 .
  • the predetermined region 520b is defined between the first reference line 503a and the radiating fin 22b farthest downward from the first reference line 503a, and the impeller 31 between the regions 510c and 510d adjacent to each other in the extending direction of the radiating fin 22.
  • the first light source 41 may overlap both of the predetermined regions 520a and 520b. Although the first light source 41 has been described above, the second light source 42 may overlap the predetermined areas 520a and 520b in the same manner as the first light source 41 does.
  • the structure 600 includes a conductive member 601 that supplies power to the fan 30 , and the conductive member 601 includes power supply wiring 605 including a connector 603 .
  • a fan-side connector 35 a of the fan-side wiring 35 extending from the fan 30 is connected to the connector 603 . Also, the connector 603 is fixed to the rear surface of the base plate 21 between the left wall of the peripheral wall portion 24 and the heat radiation fins 22 .
  • a part of the power supply side wiring 605 is supported by a clamp 630 .
  • Clamp 630 includes a holding portion 631 and a hook portion 633 .
  • the holding portion 631 has a substantially concave shape when the fan 30 is viewed from the rear, and is connected to the hook portion 633 .
  • the hooking portion 633 is hooked to the receiving member 22c by sandwiching the left and right surfaces of the receiving member 22c located in the region 510d.
  • the receiving member 22 c is a plate-like member and is provided on the back surface of the base plate 21 .
  • the receiving member 22c is connected to the surface of the radiation fin 22b on the side opposite to the gap 500 side.
  • the receiving member 22c may dissipate heat as heat dissipating fins.
  • the power-supply-side wiring 605 passes through the holding portion 631 in the front-rear direction and is hooked on the holding portion 631 , so that the holding portion 631 holds the power-supply-side wiring 605 .
  • the power supply wiring 605 further extends rearward from the holding section 631 and is connected to a power supply section (not shown). When the power supply unit supplies power to the fan 30 via the power supply wiring 605 and the fan wiring 35, the fan 30 rotates.
  • the structure 600 is located in areas 710c and 710d other than areas 710a and 710b on the leeward side of the wind passing through the gap 500 in the extending direction of the heat radiating fins 22 when the fan 30 is viewed from the rear.
  • regions 710a, 710b, 710c, and 710d are shown slightly displaced from the other regions described above for ease of viewing. Regions 710a, 710b, 710c, and 710d are described below.
  • a region 710a is a region on the left side of the gap 500 between the heat radiating fins 22 adjacent to each other and on the left side of the heat radiating fins 22 provided above the first reference line 503a in the region 510b.
  • the region 710b of the present embodiment is a region on the right side of the gap 500 between the adjacent heat dissipating fins 22 provided below the first reference line 503a in the region 510d and on the right side of the heat dissipating fins 22 .
  • Regions 710c and 710d are regions on the rear surface side of the base plate 21 outside the regions surrounded by the radiation fins 22a and 22b, excluding the regions 710a and 710b.
  • the area 710c is an area provided above a straight line parallel to the first reference line 503a and passing through the heat radiation fins 22a and above the area 710b.
  • the area 710d is an area provided below a straight line parallel to the first reference line 503a and passing through the radiation fins 22b and below the area 710a.
  • FIG. 10 shows an example in which the conductive member 601 and the clamp 630 are arranged in the region 710d, and are not arranged in the regions 710a and 710b. be provided. Note that the conductive member 601 and the clamp 630 may be provided in the region 710c. The conductive member 601 and the clamp 630 are located at a position lower than the rear end of the radiation fin 22 in the front-rear direction. The conductive member 601 is arranged apart from the heat radiating fins 22 .
  • the impeller 31 When the impeller 31 sends air to the gaps 500 between the heat dissipating fins 22 adjacent to each other, the air hits the back surface of the base plate 21 and flows through the gaps 500 along the heat dissipating fins 22 . Most of the wind flowing through the gap 500 tends to flow toward the end side of the gap 500 due to the influence of the vortex of the airflow caused by the rotation of the impeller 31 . This edge overlaps the front regions 510b, 510d.
  • the mounting bosses 23a and 23b are located on the sides of the impeller 31 in the regions 510a and 510c on the rear side of the impeller 31 in the rotational direction.
  • the wind flows in the opposite direction to the mounting boss 23a. Therefore, the mounting boss 23a is provided outside the traveling path of the wind flowing through the gap 500, and is provided at a position where the wind is not blocked. It will be.
  • blocking of the air by the mounting boss 23 a is suppressed, and the air flowing through the gap 500 where the mounting boss 23 a is positioned is blown out to the left side of the heat radiating fin 22 through the gap 500 .
  • the wind flows in the opposite direction to the mounting bosses 23b. As a result, blocking of the wind by the mounting boss 23b is also suppressed.
  • the air tends to be blown to the left side of the heat radiating fins 22 in the gaps 500 other than the gaps 500 where the mounting bosses 23a are located, in the gaps 500 above the first reference line 503a. Also, in the gap 500 below the first reference line 503a, the air tends to be blown out to the right side of the radiation fin 22. As shown in FIG.
  • the conductive member 601 and the clamp 630 are located in a region 710d other than the regions 710a and 710b on the leeward side of the wind passing through the gap 500 in the extending direction of the heat radiating fins 22. Accordingly, the conductive member 601 and the clamp 630 are provided outside the traveling path of the wind passing through the gap 500, and are provided at a position where the wind is not blocked. As a result, the wind is blown out to the side of the radiation fins 22 while the blocking of the wind by these is suppressed.
  • FIG. 11 is an enlarged view of part of FIG. 4 and schematically shows an example of optical paths of light emitted from the first light source 41 and light emitted from the second light source 42 . Note that the reflection angle, refraction angle, and the like of light shown in FIG. 11 may not be accurate.
  • the first light source 41 When forming a low-beam light distribution pattern, light is emitted from the first light source 41 .
  • Part of the light L1a emitted from the first light source 41 passes between the upper reflecting surface 51ur of the first reflector 51 and one of the second reflectors 52a and directly enters the projection lens 60 .
  • Another part of the light L1b emitted from the first light source 41 is reflected toward the projection lens 60 at a portion including the front end of the upper reflecting surface 51ur of the first reflector 51, and enters the projection lens 60. do.
  • Another part of the light L1c emitted from the first light source 41 is reflected by the reflecting surface 52ar of one of the second reflectors 52a, and the part including the front end of the upper reflecting surface 51ur of the first reflector 51 is reflected toward the projection lens 60 and enters the projection lens 60 .
  • the front end 51e of the first reflector 51 has a shape that matches the cutoff line. A cutoff line is formed in the light distribution pattern. Also, although not illustrated, part of the light emitted from the first light source 41 that diffuses in the horizontal direction is reflected by the pair of upper side reflectors 53 a and 53 b and enters the projection lens 60 . .
  • the light emitted from the first light source 41 and directly incident on the projection lens 60 and the light emitted from the first light source 41 and reflected by the reflector unit 50 and incident on the projection lens 60 form a low-beam light distribution.
  • a pattern is formed.
  • the light having this low-beam light distribution pattern is transmitted through the projection lens 60 and emitted from the vehicle headlamp 1 via the front cover 12 .
  • the rear focal point 60f of the projection lens 60 is located near the front end 51e, so the light distribution pattern of the low beam projected forward of the vehicle is a light distribution pattern that is inverted by the projection lens 60. be.
  • the light L1a that directly enters the projection lens 60 is light emitted mainly in a direction parallel to the normal 41L.
  • Light L1b reflected by the first reflector 51 and incident on the projection lens 60 and light L1c reflected by the second reflector 52a and reflected by the first reflector 51 and incident on the projection lens 60 are mainly different from the perpendicular line 41L. This is light emitted in parallel directions.
  • the light L1a may include light emitted in a direction non-parallel to the normal 41L
  • the light L1c may include light emitted in a direction parallel to the perpendicular 41L.
  • FIG. 12 is a diagram showing a low beam light distribution pattern in this embodiment.
  • S indicates a horizontal line
  • V indicates a vertical line passing through the center of the vehicle in the left-right direction
  • the low-beam light distribution pattern PL projected onto a virtual vertical screen placed 25 m in front of the vehicle is indicated by a thick line.
  • the reflector unit 50 is shaped so that the light distribution pattern of the light from the first light source 41 incident on the projection lens 60 becomes such a low-beam light distribution pattern PL.
  • the cutoff line CL of the low-beam light distribution pattern PL corresponds to the shape of the front end 51e of the first reflector 51, and has a step in this embodiment.
  • the light from the first light source 41 forms the low-beam light distribution pattern PL
  • the vehicle headlamp 1 emits light having the low-beam light distribution pattern PL.
  • Part of the light L2a emitted from the second light source 42 directly enters the projection lens 60 through the space between the lower reflecting surface 51dr of the first reflector 51 and the other second reflector 52b.
  • Another portion of the light L2b emitted from the second light source 42 is reflected toward the projection lens 60 at a portion including the front end portion of the lower reflecting surface 51dr of the first reflector 51, and is reflected toward the projection lens 60.
  • FIG. 1 Another portion of the light L2c emitted from the second light source 42 is reflected toward the projection lens 60 by the reflecting surface 52br of the other second reflector 52b, and enters the projection lens 60.
  • FIG. of the light emitted from the second light source 42 the light passing through the vicinity of the front end 51e of the first reflector 51 causes the light distribution pattern formed by the light emitted from the second light source 42 to have a cutoff line corresponding to the front end 51e. It is formed.
  • part of the light emitted from the second light source 42 that diffuses in the horizontal direction is reflected by the pair of lower side reflectors 54a and 54b and enters the projection lens 60. do.
  • This additional light distribution pattern is a light distribution pattern in which a high beam light distribution pattern is formed by being added to the low beam light distribution pattern PL.
  • the light emitted from the second light source 42 forming the additional light distribution pattern forms a high beam light distribution pattern together with the light emitted from the first light source 41 .
  • an additional light distribution pattern is formed by the light from the second light source 42 , and the light having this additional light distribution pattern is transmitted through the projection lens 60 and emitted from the vehicle headlamp 1 through the front cover 12 .
  • the additional light distribution pattern projected forward of the vehicle is a light distribution pattern that is reversed by the projection lens 60, like the low beam light distribution pattern PL.
  • the cutoff line of the additional light distribution pattern is defined by the front end 51e of the first reflector 51, similarly to the cutoff line CL of the low beam light distribution pattern PL. Therefore, the cutoff line of the additional light distribution pattern and the cutoff line CL of the light distribution pattern PL of the low beam approximately match, and the light distribution pattern of the high beam is a combination of the additional light distribution pattern and the light distribution pattern PL of the low beam. becomes.
  • the upper side of the low-beam light distribution pattern PL and the lower side of the additional light distribution pattern overlap, but the low-beam light distribution pattern PL and the additional light distribution pattern do not have to overlap.
  • at least part of the cutoff line of the additional light distribution pattern and at least part of the cutoff line CL of the low beam light distribution pattern PL match, and the additional light distribution pattern and the low beam light distribution pattern PL are connected.
  • the light L2a that directly enters the projection lens 60 is light emitted mainly in a direction parallel to the normal 42L.
  • Light L2b reflected by the first reflector 51 and incident on the projection lens 60 and light L2c reflected by the second reflector 52a and incident on the projection lens 60 are mainly emitted in a direction non-parallel to the perpendicular 42L.
  • the light L2a may include light emitted in a direction non-parallel to the normal 42L
  • the light L2b may include light emitted in a direction parallel to the perpendicular 42L.
  • the additional light distribution pattern can be changed, and the light distribution pattern of the high beam can be changed. can be changed.
  • FIG. 13 is a diagram showing the light distribution pattern of the high beam in this embodiment, and is a diagram showing the light distribution pattern of the high beam in the same manner as in FIG.
  • the high beam light distribution pattern PH shown in FIG. 13 is for the case where light is emitted from all the LEDs that constitute the second light source 42 .
  • the cutoff line CL in the low-beam light distribution pattern PL is indicated by a dotted line.
  • a region below the cutoff line CL in the light distribution pattern PH of the high beam is formed mainly by light from the first light source 41
  • a region above the cutoff line CL is formed mainly by light from the second light source 42 .
  • At least part of the mounting boss 23a is provided in the rear area 510a.
  • the fan 30 When the fan 30 is viewed from the rear, most of the wind flowing through the gap 500 tends to flow toward one end of the gap 500 due to the vortex of the airflow caused by the rotation of the impeller 31 .
  • at least part of the attachment boss 23a is provided in the rear region 510a.
  • the mounting boss 23a is provided on the side of the impeller 31 in the rear area 510a when the fan 30 is viewed from the rear, and does not block the wind.
  • the mounting boss 23a is provided in this manner, the mounting boss 23a is less likely to block the wind than when the mounting boss 23a is provided in the front region 510b. Therefore, the wind easily flows and blows off to the side of the heat radiating fins 22 , so that the heat radiating fins 22 can be easily cooled. Therefore, according to the above configuration, the heat generated by the first light source 41 and the second light source 42 can be easily transferred to the radiation fins 22, and the cooling efficiency of the first light source 41 and the second light source 42 can be improved.
  • the structure 600 is located in a region 710d other than the leeward side of the wind that has passed through the gap 500 in the extending direction of the radiation fins 22 .
  • the air sent from the fan 30 to the gaps 500 between the heat dissipating fins 22 adjacent to each other hits the back surface of the base plate 21 and flows through the gaps 500 along the heat dissipating fins 22 .
  • the fan 30 When the fan 30 is viewed from the rear, most of the wind flowing through the gap 500 tends to flow toward one end of the gap 500 due to the vortex of the airflow caused by the rotation of the fan 30 .
  • the structure 600 is located in the region 710d.
  • the structure 600 is less likely to block the wind that has passed through the gap 500 compared to the case where the structure 600 is located in the downwind regions 710a and 710b of the wind that has passed through the gap 500, and the wind is directed to the side of the heat radiating fins 22. It is easy to blow out in the direction, and the heat radiating fins 22 can be easily cooled. Therefore, according to the above configuration, the heat generated by the first light source 41 and the second light source 42 can be easily transferred to the radiation fins 22, and the cooling efficiency of the first light source 41 and the second light source 42 can be improved.
  • the structure 600 is arranged away from the heat radiation fins 22 .
  • the heat from the heat radiating fins 22 can be less likely to be transmitted to the structure 600, and the deformation of the structure 600 due to the heat can be prevented. can be suppressed.
  • the structure 600 does not have to be arranged apart from the heat radiation fins 22 .
  • the heat sink 20 further includes a mounting boss 23a
  • the fan 30 includes an impeller 31 and a support member 33b. At least part of the mounting boss 23a is provided in the rear region 510a.
  • the mounting boss 23a is provided on the side of the impeller 31 in the rear region 510a, and the wind is It is installed in a position that does not block the
  • the mounting boss 23a is less likely to block the wind than when the mounting boss 23a is provided in the front region 510b. Therefore, the wind easily flows and blows off to the side of the heat radiating fins 22 , so that the heat radiating fins 22 can be easily cooled.
  • the heat generated by the first light source 41 and the second light source 42 can be easily transferred to the radiation fins 22, and the cooling efficiency of the first light source 41 and the second light source 42 can be improved.
  • At least part of the attachment boss 23a may not be provided in the rear area 510a.
  • At least part of the mounting bosses 23a and 23b are provided in the rear regions 510a and 510c, respectively.
  • the swinging of the fan 30 due to the rotation of the impeller 31 can be suppressed compared to the case where the fan 30 is attached to the heat sink 20 at two points and thus is attached to the heat sink 20 at one point. Suppressing the swinging of the fan 30 makes it easier for the air from the impeller 31 to flow through the gap 500 and makes it easier to cool the heat radiating fins 22 than when the swinging of the fan 30 is not suppressed. At least part of the mounting bosses 23a and 23b need not be provided in the rear regions 510a and 510c, respectively.
  • mounting bosses 23a do not overlap the mounting bosses 23b along the extending direction of the radiation fins 22.
  • the air flows more easily and blows out to the side of the heat radiating fins 22, so that the heat radiating fins 22 can be easily cooled. Therefore, the heat generated by the first light source 41 and the second light source 42 can be easily transferred to the radiation fins 22, and the cooling efficiency of the first light source 41 and the second light source 42 can be improved.
  • the first light source 41 overlaps at least part of the predetermined area 520a, and the predetermined area 520a overlaps the front area 510b.
  • the predetermined area 520a is cooled more easily than the area outside the predetermined area 520a.
  • the heat generated by the first light source 41 and the second light source 42 can be more easily transferred to the heat radiation fins 22 than when the first light source 41 and the second light source 42 overlap the outer region.
  • the cooling efficiency of the first light source 41 and the second light source 42 can be improved.
  • the first light source 41 and the second light source 42 may not overlap the predetermined area 520a, and the predetermined area 520a may not overlap the front area 510b.
  • FIG. 14 is a back view of the heat sink 20 in the modified example. In FIG. 14, illustration of a part of the fan-side wiring 35 is omitted.
  • the fan 30 is rotated 45 degrees clockwise about the rotation axis R1 as compared with the present embodiment.
  • the mounting bosses 23a and 23b of this modified example are provided in the same gap 500.
  • This gap 500 is, for example, the gap 500 that overlaps the first reference line 503a when the fan 30 is viewed from the rear.
  • the mounting boss 23 a is provided on the right side of the mounting boss 23 b and overlaps the mounting boss 23 b along the extending direction of the heat radiation fins 22 .
  • the mounting boss 23a is partly provided in the region 510a and partly in the region 510d.
  • the mounting boss 23b is partially provided in the region 510c and partially provided in the region 510b.
  • the mounting bosses 23a may overlap at least a portion of the mounting bosses 23b along the extending direction of the heat radiating fins 22. As shown in FIG.
  • Either of the mounting bosses 23a and 23b may be provided. Therefore, it is not necessary to provide a plurality of mounting bosses 23a and 23b and a single through hole 33d.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
PCT/JP2022/037339 2021-10-20 2022-10-05 灯具 Ceased WO2023068059A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11261266A (ja) * 1998-03-11 1999-09-24 Denso Corp 発熱体冷却装置
JP2011155549A (ja) * 2010-01-28 2011-08-11 Mitsubishi Electric Corp 冷却構造
JP2017195046A (ja) * 2016-04-19 2017-10-26 スタンレー電気株式会社 車両用灯具
JP2020107495A (ja) * 2018-12-27 2020-07-09 株式会社小糸製作所 灯具ユニット

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11261266A (ja) * 1998-03-11 1999-09-24 Denso Corp 発熱体冷却装置
JP2011155549A (ja) * 2010-01-28 2011-08-11 Mitsubishi Electric Corp 冷却構造
JP2017195046A (ja) * 2016-04-19 2017-10-26 スタンレー電気株式会社 車両用灯具
JP2020107495A (ja) * 2018-12-27 2020-07-09 株式会社小糸製作所 灯具ユニット

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