WO2021006283A1 - Vehicular head lamp - Google Patents

Vehicular head lamp Download PDF

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Publication number
WO2021006283A1
WO2021006283A1 PCT/JP2020/026612 JP2020026612W WO2021006283A1 WO 2021006283 A1 WO2021006283 A1 WO 2021006283A1 JP 2020026612 W JP2020026612 W JP 2020026612W WO 2021006283 A1 WO2021006283 A1 WO 2021006283A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
distribution pattern
reflector
emitted
Prior art date
Application number
PCT/JP2020/026612
Other languages
French (fr)
Japanese (ja)
Inventor
貴彦 本多
Original Assignee
株式会社小糸製作所
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 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Priority to JP2021530709A priority Critical patent/JPWO2021006283A1/ja
Publication of WO2021006283A1 publication Critical patent/WO2021006283A1/en

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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]
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • 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
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled 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
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • 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
    • F21S41/50—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • 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
    • 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
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • 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 a vehicle headlight.
  • Patent Document 1 discloses such a headlight for a vehicle.
  • the vehicle headlight described in Patent Document 1 below includes a first light source, a second light source, a reflector, and a projection lens.
  • the reflector reflects the light emitted from the first light source
  • the second light source is composed of a plurality of light emitting elements arranged in parallel in the left-right direction.
  • the light reflected by the reflector and the light emitted from the second light source pass through the projection lens, and the light transmitted through the projection lens forms a high beam light distribution pattern.
  • this vehicle headlight changes the light distribution pattern of the high beam to a light distribution pattern in which a part of the light distribution pattern of the high beam is missing by controlling the lighting and extinguishing of each of the plurality of light emitting elements. It is said that it can be made to do.
  • the light distribution pattern of the emitted light is changed by controlling the lighting and extinguishing of the plurality of light emitting elements of the second light source.
  • the changeable light distribution pattern depends on the size of the light emitting element. In general, it tends to be difficult to miniaturize the light emitting element. For this reason, such vehicle headlights tend to have difficulty in finely changing the light distribution pattern, and for example, the driver may feel uncomfortable with the change in the light distribution pattern.
  • an object of the present invention is to provide a vehicle headlight capable of improving the definition in the change of the light distribution pattern of the emitted light.
  • the vehicle headlight of the present invention can individually switch between a first light source, a second light source, a first reflector that reflects light emitted from the first light source, and a tilted state. It has a reflection control surface composed of the reflection surfaces of the plurality of reflection elements, and the light emitted from the second light source is reflected by the reflection control surface, and a light distribution pattern corresponding to the tilted state of the plurality of reflection elements. It is characterized by including a light distribution pattern forming unit that emits light having the above, a projection lens through which light reflected by the first reflector and light emitted from the light distribution pattern forming unit are transmitted.
  • this vehicle headlight the light reflected by the first reflector and the light emitted from the light distribution pattern forming portion are emitted through the projection lens. Therefore, this vehicle headlight can form a specific light distribution pattern by these lights. Further, in this vehicle headlight, the light distribution pattern of the light emitted from the light distribution pattern forming unit can be changed by controlling the tilted state of the plurality of reflecting elements. Therefore, the vehicle headlight can change a specific light distribution pattern formed by the emitted light.
  • a reflecting element that reflects light tends to be smaller than a light emitting element that emits light.
  • this vehicle headlight is different from the case where the light distribution pattern forming unit changes the light distribution pattern of the emitted light by controlling the lighting and extinguishing of each of the plurality of light emitting elements. It is possible to improve the definition in the change of the light distribution pattern of the light emitted from the illuminating lamp.
  • the vehicle headlight may further include a second reflector that reflects the light emitted from the second light source and condenses it on the reflection control surface.
  • the first reflector is arranged so as to cover the first light source from above, and the second light source and the second reflector are below the first reflector.
  • the light distribution pattern forming portion may be arranged above the second light source and below the first reflector.
  • the vehicle headlight When the vehicle headlight includes a second reflector, the vehicle headlight further includes a substrate on which the second light source is mounted, and the reflective surface of the first reflector is the second light source of the substrate. It may be located on the side opposite to the second light source side with respect to the reference surface including the side surface.
  • the light emitted from the light source mounted on the substrate propagates mainly to the region on the light source side from the reference surface including the surface on the light source side of the substrate. Therefore, in this vehicle headlight, the light emitted from the second light source propagates to the region on the second light source side from the surface including the surface on the second light source side of the substrate on which the second light source is mounted. Further, as described above, the reflection surface of the first reflector is located on the side opposite to the second light source side with respect to the reference surface. Therefore, this vehicle headlight is a part of the light emitted from the second light source as compared with the case where at least a part of the reflection surface of the first reflector is located on the second light source side of the above reference surface.
  • this vehicle headlight can suppress that a part of the light emitted from the second light source is reflected by the reflecting surface of the first reflector to become stray light, and unintended light is emitted or stray light is emitted. It is possible to prevent unintended members from being heated.
  • the second reflector may traverse the entire region between the projection lens and the second light source.
  • the incident angles of these lights on the projection lens may be different. Therefore, when these lights are incident on the same region of the incident surface of the projection lens, it tends to be difficult to design the incident surface in the region. However, in this vehicle headlight, since these lights are incident on different regions of the incident surface of the projection lens, the design of the projection lens can be facilitated.
  • the present invention it is possible to provide a vehicle headlight capable of improving the definition in the change of the light distribution pattern of the emitted light.
  • FIG. 1 It is a figure which shows schematicly the headlight for a vehicle in embodiment of this invention. It is a figure which shows schematic cross section of the light distribution pattern forming part. It is a figure which shows roughly the cross section of a part of the reflection part. It is a front view which shows the projection lens schematicly. It is a figure which shows the light distribution pattern of a low beam. It is a figure which shows the light distribution pattern of a high beam.
  • FIG. 1 is a diagram schematically showing a vehicle headlight according to an embodiment of the present invention, and is a diagram schematically showing a vertical cross section of the vehicle headlight.
  • the vehicle headlight 1 of the present embodiment is a vehicle headlight. Headlights for automobiles are generally provided in each of the left and right directions in front of the vehicle, and the left and right headlights are configured to be substantially symmetrical in the left and right directions. Therefore, in the present embodiment, one of the headlights will be described.
  • the vehicle headlight 1 of the present embodiment includes a housing 10 and a lamp unit 20 as main configurations.
  • the housing 10 includes a lamp housing 11, a front cover 12, and a back cover 13 as main configurations.
  • the front of the lamp housing 11 has an opening, and the front cover 12 is fixed to the lamp housing 11 so as to close the opening. Further, an opening smaller than the front is formed behind the lamp housing 11, and the back cover 13 is fixed to the lamp housing 11 so as to close the opening.
  • the space formed by the lamp housing 11, the front cover 12 that closes the front opening of the lamp housing 11, and the back cover 13 that closes the rear opening of the lamp housing 11 is a light chamber R, and the light room R is
  • the lamp unit 20 is housed inside.
  • the lamp unit 20 of the present embodiment includes a heat sink 30, a cooling fan 35, a first light source 41, a second light source 42, a first reflector 50, a second reflector 60 as a light guide member, and a light distribution pattern.
  • the forming portion 70 and the projection lens 80 are mainly provided, and are fixed to the housing 10 by a configuration (not shown).
  • the heat sink 30 of the present embodiment is made of a metal member, and has a first base plate 31, a second base plate 32, a third base plate 33, and a plurality of heat radiation fins 34.
  • the first base plate 31 is a plate-shaped metal member extending back and forth and left and right.
  • the second base plate 32 is a plate-shaped metal member extending diagonally downwardly forward and to the left and right.
  • the third base plate 33 is a plate-shaped metal member extending vertically and horizontally.
  • the second base plate 32 is arranged below the first base plate 31.
  • the upper end of the third base plate 33 is connected to the front end of the first base plate 31, and the lower end of the third base plate 33 is connected to the rear end of the second base plate 32.
  • a shade 36 that protrudes upward from the upper surface of the first base plate 31 is provided at the front end portion of the first base plate 31.
  • Each of the heat radiating fins 34 is a plate-shaped metal member arranged behind the second base plate 32 and the third base plate 33 and extending to the left, right, front and back.
  • the front end of each heat radiation fin 34 is connected to the second base plate 32 or the third base plate 33.
  • the first base plate 31, the second base plate 32, the third base plate 33, and the plurality of heat radiation fins 34 are integrally formed.
  • the cooling fan 35 is arranged with a gap from the heat radiation fin 34 and is fixed to the heat sink 30.
  • the heat sink 30 is cooled by the air flow generated by the rotation of the cooling fan 35.
  • the first light source 41 is a light emitting element that emits light, and in the present embodiment, it is a surface mount type LED (Light Emitting Diode) that emits white diffused light with a substantially rectangular exit surface.
  • the first light source 41 is mounted on the first substrate 45.
  • the first substrate 45 is placed on the upper surface of the first base plate 31 in the heat sink 30.
  • the first substrate 45 is located behind the shade 36 provided on the first base plate 31. Therefore, the first light source 41 mounted on the first substrate 45 is located behind the shade 36.
  • the exit surface of the first light source 41 faces upward, and the optical axis 41a of the first light source 41 extends substantially vertically from the first light source 41 and is substantially perpendicular to the first substrate 45. Then, the first light source 41 emits light toward the upper side.
  • the second light source 42 is a light emitting element that emits light, and in the present embodiment, the second light source 42 is a surface mount type LED that emits white diffused light with a substantially rectangular exit surface. Will be done.
  • the second light source 42 is mounted on the second substrate 46.
  • the second substrate 46 is placed on the front surface of the second base plate 32 of the heat sink 30, and the exit surface of the second light source 42 faces forward and upward.
  • the optical axis 42a of the second light source 42 extends obliquely forward and upward from the second light source 42, and is substantially perpendicular to the second substrate 46. Then, the second light source 42 emits light toward the front side.
  • the number and types of the first light source 41 and the second light source 42 are not particularly limited, and for example, these light sources 41 and 42 may be laser elements that emit laser light.
  • the first reflector 50 is a member that reflects the light emitted from the first light source 41.
  • the first reflector 50 of the present embodiment is a curved plate-shaped member, is arranged so as to cover the first light source 41 from above, and is fixed to the first base plate 31 of the heat sink 30.
  • the first reflector 50 is located above the second light source 42. That is, the second light source is arranged below the first reflector 50.
  • the surface of the first reflector 50 on the side of the first light source 41 is a reflecting surface 50r that reflects the light emitted from the first light source 41.
  • the reflecting surface 50r is based on a rotating elliptic surface, and the first light source 41 is located near the first focal point or the first focal point of the elliptic surface, and the first light source 41 is located near the second focal point or the second focal point of the elliptic surface.
  • the upper end of the shade 36 provided on the base plate 31 is located. Then, the light emitted from the first light source 41 is mainly reflected forward by the reflecting surface 50r.
  • the reflecting surface 50r is located on the rear side opposite to the second light source 42 side with respect to the reference surface RP1 including the surface on the second light source 42 side of the second substrate 46 on which the second light source 42 is mounted. ing.
  • the second reflector 60 as a light guide member is a member that guides the light emitted from the second light source 42 to the light distribution pattern forming unit 70 described later, and distributes the light emitted from the second light source 42 by the reflecting surface 60r. It is configured to reflect toward the light pattern forming unit 70.
  • the second reflector 60 of the present embodiment is a curved plate-shaped member, and is arranged below the first reflector 50 so as to cover the second light source 42 from the front side.
  • the surface of the second reflector 60 on the side of the second light source 42 is a reflecting surface 60r that reflects the light emitted from the second light source 42.
  • the reflecting surface 60r is curved so as to be concave on the side opposite to the second light source 42 side, and is, for example, a curved surface based on a rotating elliptic curved surface.
  • the reflecting surface 60r is configured to collect the light emitted from the second light source 42 and irradiate the light distribution pattern forming unit 70.
  • FIG. 2 is a diagram schematically showing a cross section of the light distribution pattern forming portion 70, and is a diagram schematically showing a cross section of the light distribution pattern forming portion 70 in the vertical direction.
  • the light distribution pattern forming unit 70 of the present embodiment is a so-called DMD.
  • the light distribution pattern forming portion 70 includes a reflecting portion 71, an edge cover 72, and a protective cover 73 as main configurations.
  • the description inside the reflection unit 71 is omitted.
  • the reflection unit 71 has a reflection control surface 71S that reflects incident light, and is configured to form a predetermined light distribution pattern by the light reflected by the reflection control surface 71S.
  • the reflection portion 71 is formed to be substantially rectangular in the front view, and the entire region in the front view is the reflection control surface 71S.
  • the edge cover 72 covers the entire circumference of the side surface of the reflection portion 71 and the side opposite to the reflection control surface 71S.
  • the protective cover 73 is a plate-shaped member having translucency, and is fixed to the edge cover 72 so as to cover the reflection control surface 71S.
  • the light distribution pattern forming unit 70 is mounted on the third substrate 47.
  • the third substrate 47 is placed on the front surface of the third base plate 33 in the heat sink 30. Therefore, the first substrate 45 on which the first light source 41 is mounted, the second substrate 46 on which the second light source 42 is mounted, and the third substrate 47 on which the light distribution pattern forming unit 70 is mounted are combined into one heat sink 30. It is placed.
  • the light distribution pattern forming portion 70 mounted on the third substrate 47 is located behind and above the second light source 42 and below the first reflector 50. Further, the surface 73S of the protective cover 73 extends substantially vertically and in the left-right direction. Then, the light reflected by the reflection control surface 71S is emitted forward from the light distribution pattern forming portion 70 via the protective cover 73.
  • the surface 73S of the protective cover 73 opposite to the reflection control surface 71S side is an incident surface and an exit surface of the light distribution pattern forming portion 70.
  • the edge cover 72 is not particularly limited, and may not cover the back surface side of the reflective portion 71, for example. Further, the light distribution pattern forming portion 70 does not have to include the edge cover 72 and the protective cover 73.
  • FIG. 3 is a diagram schematically showing a cross section of a part of the reflecting portion 71, and is a diagram schematically showing a cross section of a part of the reflecting portion 71 in the vertical direction.
  • the reflection unit 71 of the present embodiment has a plurality of reflection elements 74 two-dimensionally arranged on a substrate (not shown), and the reflection control surface 71S of the reflection unit 71 is composed of the reflection surfaces 74r of the plurality of reflection elements 74. ing.
  • the plurality of reflecting elements 74 are individually tiltably supported on the above-mentioned substrate about the rotation shaft 74a.
  • the plurality of reflecting elements 74 can be individually switched between a first tilted state in which one side is tilted by a predetermined angle and a second tilted state in which the other side is tilted by the same angle as the predetermined angle. ..
  • the rotation axes 74a of the plurality of reflecting elements 74 are substantially parallel to each other, and each reflecting element 74 receives light from the second light source 42 incident on the reflecting surface 74r in the first tilted state. It reflects in the first direction.
  • each of the reflecting elements 74 reflects the light from the second light source 42 incident on the reflecting surface 74r in the second tilted state in a second direction different from the first direction.
  • the plurality of reflecting elements 74 can reflect the light from the second light source incident on the reflecting surface 74r in the first tilted state toward the first direction.
  • the plurality of reflecting elements 74 may include a plurality of reflecting elements having different second directions from the first direction. That is, the rotation axes 74a of the plurality of reflecting elements 74 may be non-parallel to each other.
  • a reflection unit drive circuit (not shown) is connected to the reflection unit 71, and the tilted state of each reflection element 74 is switched according to the voltage applied to each reflection element 74 by the reflection unit drive circuit.
  • the reflection control surface 71S is substantially parallel to the surface 73S of the protective cover 73. is there.
  • such a light distribution pattern forming unit 70 By controlling the tilted state of the plurality of reflecting elements 74 of the reflecting unit 71, such a light distribution pattern forming unit 70 creates a predetermined light distribution pattern by the light emitted from the reflection control surface 71S in the first direction. It can be formed and this light distribution pattern can be changed. Further, the light distribution pattern forming unit 70 can set the light intensity distribution in the predetermined light distribution pattern to a predetermined intensity distribution by controlling the tilted state of the reflecting element 74 over time. That is, it can be understood that the light distribution pattern forming unit 70 emits light having a light distribution pattern corresponding to the tilted state of the plurality of reflecting elements 74. Most of the light reflected in the second direction by the reflection control surface 71S is converted into heat by a light absorbing member (not shown).
  • the projection lens 80 is a lens that adjusts the divergence angle of incident light.
  • the projection lens 80 is arranged in front of the first light source 41, the first reflector 50, and the light distribution pattern forming unit 70. Light emitted from the first light source 41 and reflected by the first reflector 50 and light having a predetermined light distribution pattern emitted from the light distribution pattern forming unit 70 are incident on the projection lens 80, and the divergence angle of these lights is projected. It is adjusted by the lens 80. These lights whose divergence angles are adjusted by the projection lens 80 are emitted from the vehicle headlight 1 via the front cover 12.
  • the projection lens 80 is a lens in which the entrance surface 80i and the exit surface 80o are formed in a convex shape.
  • the optical axis 80a of the projection lens 80 passes through the reflection control surface 71S in the light distribution pattern forming unit 70, and the rear focal point of the projection lens 80 is located on or near the reflection control surface 71S. Further, the optical axis 80a of the projection lens 80 is substantially perpendicular to the reflection control surface 71S.
  • the optical axis 80a of the projection lens 80 is used as a reference, the first light source 41 and the first reflector 50 are arranged above the optical axis 80a, and the second light source 42 and the second reflector 60 are arranged above the optical axis 80a. It is arranged below the optical axis 80a.
  • the second reflector 60 as a light guide member crosses the entire region between the projection lens 80 and the second light source 42. The upper part and the lower part of the projection lens 80 may be cut out.
  • FIG. 4 is a front view schematically showing the projection lens 80, and is a view of the projection lens 80 viewed from the incident surface 80i side.
  • the incident surface 80i includes a first region 80ia and a second region 80ib.
  • the second region 80ib is hatched.
  • the first region 80ia is located above the second region 80ib. That is, the first region 80ia is located on the side opposite to the second light source 42 side with respect to the second region 80ib.
  • the light having a predetermined light distribution pattern emitted from the light distribution pattern forming unit 70 is incident on the first region 80ia, and the light emitted from the first light source 41 and reflected by the first reflector 50 is the second light.
  • the first incident region where the light having a predetermined light distribution pattern emitted from the light distribution pattern forming unit 70 is incident
  • the second incident region where the light emitted from the first light source 41 and reflected by the first reflector 50 is incident. It can be understood that the incident regions do not overlap with each other. The first incident region and the second incident region may overlap each other.
  • the first light source 41 is located behind the shade 36 provided on the first base plate 31, and the shade 36 is a combination of the first light source 41 and the projection lens 80. It is located in between. Further, the upper end portion of the shade 36 is located on or near the surface of the light distribution pattern forming portion 70 including the reflection control surface 71S.
  • the surface including the reflection control surface 71S is, for example, the reflection control surface 71S when the tilting state of the plurality of reflection elements 74 is such that the reflection surfaces 74r of the plurality of reflection elements 74 are located on the same plane. It is a plane containing.
  • the shade 36 blocks a part of the light emitted from the first light source 41 and reflected by the first reflector 50.
  • the light emitted from the first light source 41 and reflected by the first reflector 50 is controlled by the shade 36 and passes through the projection lens 80. Therefore, the light emitted from the first light source 41 and transmitted through the projection lens 80 is light having a specific light distribution pattern according to the shapes of the reflecting surface 50r and the shade 36 of the first reflector 50.
  • the reflecting surface 50r and the shade 36 of the first reflector 50 are shaped so that the light distribution pattern of the light emitted from the first light source 41 and incident on the projection lens 80 becomes a low beam light distribution pattern.
  • the operation of the vehicle headlight 1 will be described. Specifically, the operation of emitting a low beam and the operation of emitting a high beam will be described.
  • the case of emitting a low beam will be described.
  • Power is supplied to the first light source 41 from a power source (not shown), and white light is emitted from the first light source 41.
  • the light emitted from the first light source 41 is reflected by the reflecting surface 50r of the first reflector 50, and a part of the light L1A reflected by the reflecting surface 50r is shielded by the shade 36.
  • the other part passes through the projection lens 80.
  • the shade 36 blocks a part of the light reflected by the reflecting surface 50r of the first reflector 50 so that the light distribution pattern of the light incident on the projection lens 80 becomes the low beam light distribution pattern. Therefore, the light having the low beam light distribution pattern passes through the projection lens 80 and is emitted from the vehicle headlight 1 via the front cover 12. That is, a low beam is emitted from the vehicle headlight 1.
  • FIG. 5 is a diagram showing a low beam light distribution pattern.
  • S indicates a horizontal line
  • the light distribution pattern is indicated by a thick line.
  • the reflecting surface 50r and the shade 36 of the first reflector 50 are shaped so that the light distribution pattern of the light L1A emitted from the first light source 41 and incident on the projection lens 80 becomes such a low beam light distribution pattern PL.
  • the case of emitting a high beam will be described.
  • Power is supplied to the first light source 41 and the second light source 42 from a power source (not shown), and white light is emitted from the first light source 41 and the second light source 42.
  • the low beam is emitted from the vehicle headlight 1.
  • the light emitted from the second light source 42 is reflected toward the light distribution pattern forming portion 70 by the reflecting surface 60r of the second reflector 60 as a light guide member.
  • the light L2A reflected by the reflection surface 60r of the second reflector 60 is condensed and irradiated to the reflection control surface 71S of the light distribution pattern forming unit 70, and is reflected by the reflection control surface 71S.
  • the light L2A is applied to the entire surface of the reflection control surface 71S.
  • the light distribution pattern forming unit 70 emits light L2B having a predetermined light distribution pattern in the first direction, and the light L2B passes through the projection lens 80. Then, the low beam and the light L2B having a predetermined light distribution pattern are emitted from the vehicle headlight 1 via the front cover 12.
  • FIG. 6 is a diagram showing a high beam light distribution pattern.
  • S indicates a horizontal line.
  • the high beam light distribution pattern PH is formed by the low beam light distribution pattern PL and the predetermined light distribution pattern PT1 formed by the light L2B.
  • the outline of the high beam light distribution pattern PH is shown by a thick line
  • the outline of the low beam light distribution pattern PL is shown by a long-dotted line
  • the outline of the predetermined light distribution pattern PT1 is shown by a dotted line. ..
  • the portion overlapping the contour of the high beam light distribution pattern PH is shown offset from the contour of the high beam light distribution pattern PH. ..
  • the upper part of the high beam light distribution pattern PH is formed by the predetermined light distribution pattern PT1
  • the lower part is formed by the low beam light distribution pattern PL.
  • the lower part of the predetermined light distribution pattern PT1 and the upper part of the low beam light distribution pattern PL overlap each other. That is, the tilted state of the plurality of reflecting elements of the reflecting unit 71 in the light distribution pattern forming unit 70 is controlled so that such a predetermined light distribution pattern PT1 is formed.
  • the vehicle headlight 1 of the present embodiment emits a low beam and light L2B having a predetermined light distribution pattern PT1. Then, a high beam light distribution pattern PH is formed by these lights, and the high beam is emitted from the vehicle headlight 1. A part of the light distribution pattern PH of the high beam emitted in this way is formed by light including light L2B emitted from the light distribution pattern forming unit 70. Therefore, the light distribution pattern of the region of the high beam light distribution pattern PH formed by the light including the light L2B and overlapping with the predetermined light distribution pattern PT1 in FIG. 5 can be changed.
  • the light distribution pattern in this region can be changed according to the situation in front of the vehicle, and the high beam emitted from the vehicle headlight 1 can be an ADB (Adaptive Driving Beam).
  • the predetermined light distribution pattern PT1 and the low beam light distribution pattern PL do not have to overlap each other.
  • the tilted state of the plurality of reflecting elements of the reflecting portion 71 in the light distribution pattern forming portion 70 is controlled so that the lower edge of the predetermined light distribution pattern PT1 and the upper edge of the low beam light distribution pattern PL are in contact with each other. Will be done.
  • the vehicle headlight 1 of the present embodiment includes a first light source 41, a second light source 42, a first reflector 50, a light distribution pattern forming unit 70, and a projection lens 80.
  • the first reflector 50 reflects the light emitted from the first light source 41.
  • the light distribution pattern forming unit 70 has a reflection control surface 71S composed of reflection surfaces 74r of a plurality of reflection elements 74 whose tilting states can be individually switched.
  • the light distribution pattern forming unit 70 reflects the light emitted from the second light source 42 by the reflection control surface 71S, and emits light L2B having a light distribution pattern corresponding to the tilted state of the plurality of reflecting elements 74.
  • the light L1A reflected by the first reflector 50 and the light L2B having a predetermined light distribution pattern PT1 which is a light distribution pattern emitted from the light distribution pattern forming unit 70 and corresponding to the tilted state of the plurality of reflecting elements 74 can be used as a projection lens.
  • PT1 a light distribution pattern emitted from the light distribution pattern forming unit 70 and corresponding to the tilted state of the plurality of reflecting elements 74
  • the vehicle headlight 1 of the present embodiment the light L1A reflected by the first reflector 50 and the light L2B having a predetermined light distribution pattern PT1 are emitted through the projection lens 80. Then, the vehicle headlight 1 of the present embodiment forms a high beam light distribution pattern PH by these lights L1A and L2B. Further, the vehicle headlight 1 of the present embodiment can change a predetermined light distribution pattern PT1 of the light L2B emitted from the light distribution pattern forming unit 70 by controlling the tilted state of the plurality of reflecting elements 74. Therefore, the vehicle headlight 1 of the present embodiment can change the light distribution pattern of the emitted light, and can emit the ADB as described above, for example.
  • a reflecting element that reflects light tends to be smaller than a light emitting element that emits light. Therefore, in the vehicle headlight 1 of the present embodiment, as compared with the case where the light distribution pattern forming unit 70 changes the light distribution pattern emitted by controlling the lighting and extinguishing of each of the plurality of light emitting elements.
  • the definition in the change of the light distribution pattern PH of the high beam can be improved. Therefore, the vehicle headlight 1 of the present embodiment can suppress, for example, the driver from feeling uncomfortable with the change in the light distribution pattern PH of the high beam.
  • the vehicle headlight 1 of the present embodiment further includes a second reflector 60 that reflects the light emitted from the second light source 42 and condenses it on the reflection control surface 71S. Therefore, the vehicle headlight 1 of the present embodiment emits light from the second light source 42 and irradiates the reflection control surface 71S as compared with the case where the vehicle headlight 1 does not include the second reflector 60. The amount of light emitted can be increased and energy efficiency can be improved.
  • the first reflector 50 is arranged so as to cover the first light source 41 from the upper side.
  • the second light source 42 and the second reflector 60 are arranged below the first reflector 50.
  • the light distribution pattern forming unit 70 is arranged above the second light source 42 and below the first reflector 50.
  • the reflection surface 50r of the first reflector 50 is located on the side opposite to the second light source 42 side with respect to the reference surface RP1 including the surface on the second light source 42 side of the second substrate 46 on which the second light source 42 is mounted. ..
  • the light emitted from the light source mounted on the substrate propagates mainly to the region on the light source side from the reference surface including the surface on the light source side of the substrate. Therefore, in the vehicle headlight 1 of the present embodiment, the light emitted from the second light source 42 is a reference surface including the surface of the second substrate 46 on which the second light source 42 is mounted on the second light source 42 side. It propagates to the region on the second light source 42 side from RP1. Further, as described above, the reflection surface of the first reflector 50 is located on the side opposite to the second light source 42 side with respect to the reference surface RP1.
  • the second light source 42 is compared with the case where at least a part of the reflection surface 50r of the first reflector 50 is located closer to the second light source 42 than the reference surface RP1. It is possible to suppress that a part of the light emitted from the first reflector 50 is incident on the reflecting surface 50r of the first reflector 50. Therefore, the vehicle headlight 1 of the present embodiment can suppress that a part of the light emitted from the second light source 42 is reflected by the reflecting surface 50r of the first reflector 50 and becomes stray light, which is not intended. It is possible to suppress the emission of light and the heating of unintended members due to stray light.
  • the second reflector 60 crosses the entire region between the projection lens 80 and the second light source 42. Therefore, it is possible to suppress the light emitted from the second light source from directly entering the projection lens, and it is possible to suppress the emission of unintended light.
  • the first incident region where the light L2B emitted from the light distribution pattern forming portion 70 on the incident surface 80i of the projection lens 80 is incident and the light L1A reflected by the first reflector 50 are formed.
  • the incident second incident region does not overlap with each other. Since the light L2B emitted from the light distribution pattern forming unit 70 and the light L1A reflected by the first reflector 50 are emitted from different positions, the incident angles of these lights L2B and L1A on the projection lens 80 may be different. Therefore, when these lights L2B and L1A are incident on the same region of the incident surface 80i of the projection lens 80, the design of the incident surface 80i in the region tends to be difficult. However, in the vehicle headlight 1 of the present embodiment, since these lights L2B and L1A are incident on different regions of the incident surface 80i of the projection lens 80, the design of the projection lens 80 can be facilitated.
  • the first substrate 45 on which the first light source 41 is mounted, the second substrate 46 on which the second light source 42 is mounted, and the light distribution pattern forming unit 70 are mounted.
  • a third substrate 47 and a heat sink 30 on which these substrates 45, 46, 47 are placed are further provided. Therefore, the number of parts can be reduced as compared with the case where the substrates 45, 46, and 47 are mounted on different heat sinks. From the viewpoint of reducing the number of parts, the vehicle headlight 1 may be provided with a heat sink on which at least two of the substrates 45, 46, and 47 are mounted.
  • the vehicle headlight 1 includes a second reflector 60 as a light guide member that guides the light emitted from the second light source 42 to the light distribution pattern forming unit 70.
  • the light guide member is not particularly limited.
  • the light guide member may be a lens, and the light emitted from the second light source 42 by the lens may be guided to the light distribution pattern forming unit 70.
  • the vehicle headlight 1 does not have to be provided with such a light guide member.
  • the second reflector 60 as the light guide member is located behind the projection lens 80, and the second light source 42 is located in front of the light distribution pattern forming portion 70.
  • the arrangement of the second light source 42 and the second reflector 60 is not particularly limited as long as the light emitted from the second light source 42 can be guided to the light distribution pattern forming portion 70 by the second reflector 60.
  • the projection lens 80 and the second reflector 60 may overlap in the vertical direction.
  • the second light source 42 may be located behind the light distribution pattern forming portion 70.
  • the vehicle headlight 1 includes a projection lens 80 composed of one lens.
  • the projection lens 80 included in the vehicle headlight 1 may be a lens group composed of a plurality of lenses arranged in parallel in the optical axis direction, and the plurality of arranged lenses are a convex lens, a concave lens, and a free curved lens. And so on, a plurality of types of lenses may be included.
  • the low beam light distribution pattern PL is formed by the light emitted from the first light source 41 and reflected by the first reflector 50.
  • the low beam light distribution pattern PL is formed by, for example, the light emitted from the first light source 41 and reflected by the first reflector 50, and the light emitted from the first light source 41 and not reflected by the first reflector 50. May be done.
  • the low beam light distribution pattern PL may be formed by light including light L1B emitted from the first light source 41 and reflected by the first reflector 50 and light L2B emitted from the light distribution pattern forming unit 70. ..
  • the light L2B emitted from the light distribution pattern forming unit 70 forms a region of the low beam light distribution pattern PL that is in contact with at least a part of the cut-off line CL, which is the upper edge. It is more preferable to form a region in contact with all of the above. That is, the tilted state of the plurality of reflecting elements of the reflecting unit 71 in the light distribution pattern forming unit 70 is controlled so that such a region is formed by the light L2B. With such a configuration, the shape of the shade 36 can be made a simple shape. Further, the definition of the cut-off line CL can be improved as compared with the case where the light distribution pattern forming unit 70 changes the light distribution pattern emitted by controlling the lighting and extinguishing of each of the plurality of light emitting elements.
  • the shade 36 protrudes upward from the upper surface of the first base plate 31.
  • the shade 36 may be located between the first light source 41 and the projection lens 80, and may block a part of the light emitted from the first light source 41 and incident on the projection lens 80.
  • the shade 36 may project forward from the front surface of the third base plate 33.
  • the shade 36 may be a part of the first base plate 31 as the shade 36 without protruding from the first base plate 31.
  • a vehicle headlight capable of improving the definition in a change in the light distribution pattern of the emitted light is provided, and can be used in a field such as a vehicle headlight such as an automobile.

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  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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  • Mechanical Engineering (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

A vehicular head lamp (1) is provided with: a first light source (41); a second light source (42); a first reflector (50) for reflecting light emitted from the first light source (41); a light distribution pattern formation part (70) that has a reflection control surface (71S), which is configured from reflective surfaces (74r) of a plurality of reflective elements (74) the tilt states of which can be individually switched, and that causes light emitted from the second light source (42) to be reflected by the reflection control surface (71S) so as to emit light (L2B) having a light distribution pattern corresponding to the tilt states of the plurality of reflective elements (74); and a projection lens (80) through which the light (L1A) reflected by the first reflector (50) and the light (L2B) emitted from the light distribution pattern formation part (70) pass.

Description

車両用前照灯Vehicle headlights
　本発明は、車両用前照灯に関する。 The present invention relates to a vehicle headlight.
　自動車用ヘッドライトに代表される車両用前照灯として、出射する光の配光パターンの一部を変化させることができるものが知られている。下記特許文献１には、このような車両用前照灯が開示されている。 It is known as a vehicle headlight represented by an automobile headlight that can change a part of the light distribution pattern of the emitted light. The following Patent Document 1 discloses such a headlight for a vehicle.
　下記特許文献１に記載の車両用前照灯は、第１光源と、第２光源と、リフレクタと、投影レンズとを備える。リフレクタは、第１光源から出射する光を反射し、第２光源は、左右方向に並列される複数の発光素子からなっている。この車両用前照灯では、リフレクタで反射した光、及び第２光源から出射する光が投影レンズを透過し、当該投影レンズを透過したこれら光によってハイビームの配光パターンが形成されている。そして、この車両用前照灯は、複数の発光素子のそれぞれの点灯と消灯とを制御することで、ハイビームの配光パターンを当該ハイビームの配光パターンの一部が欠落した配光パターンに変化させることができるとされている。 The vehicle headlight described in Patent Document 1 below includes a first light source, a second light source, a reflector, and a projection lens. The reflector reflects the light emitted from the first light source, and the second light source is composed of a plurality of light emitting elements arranged in parallel in the left-right direction. In this vehicle headlight, the light reflected by the reflector and the light emitted from the second light source pass through the projection lens, and the light transmitted through the projection lens forms a high beam light distribution pattern. Then, this vehicle headlight changes the light distribution pattern of the high beam to a light distribution pattern in which a part of the light distribution pattern of the high beam is missing by controlling the lighting and extinguishing of each of the plurality of light emitting elements. It is said that it can be made to do.
国際公開第２０１７／１０４６７９号International Publication No. 2017/104679
　特許文献１に記載の車両用前照灯では、上記のように、第２光源の複数の発光素子のそれぞれの点灯と消灯とを制御することで出射する光の配光パターンを変化させるため、変化可能な配光パターンは発光素子の大きさに依存する。一般的に、発光素子を小型化することは難しい傾向にある。このため、このような車両用前照灯は、配光パターンを細かく変化させ難い傾向にあり、例えば運転者が配光パターンの変化に違和感を覚える場合がある。 In the vehicle headlight described in Patent Document 1, as described above, the light distribution pattern of the emitted light is changed by controlling the lighting and extinguishing of the plurality of light emitting elements of the second light source. The changeable light distribution pattern depends on the size of the light emitting element. In general, it tends to be difficult to miniaturize the light emitting element. For this reason, such vehicle headlights tend to have difficulty in finely changing the light distribution pattern, and for example, the driver may feel uncomfortable with the change in the light distribution pattern.
　そこで、本発明は、出射する光の配光パターンの変化における精細度を向上し得る車両用前照灯を提供することを目的とする。 Therefore, an object of the present invention is to provide a vehicle headlight capable of improving the definition in the change of the light distribution pattern of the emitted light.
　上記目的の達成のため、本発明の車両用前照灯は、第１光源と、第２光源と、前記第１光源から出射する光を反射する第１リフレクタと、傾倒状態を個別に切り替え可能である複数の反射素子の反射面によって構成される反射制御面を有し、前記第２光源から出射する光を前記反射制御面によって反射して前記複数の反射素子の傾倒状態に応じる配光パターンを有する光を出射する配光パターン形成部と、前記第１リフレクタで反射した光、及び前記配光パターン形成部から出射する光が透過する投影レンズと、を備えることを特徴とする。 In order to achieve the above object, the vehicle headlight of the present invention can individually switch between a first light source, a second light source, a first reflector that reflects light emitted from the first light source, and a tilted state. It has a reflection control surface composed of the reflection surfaces of the plurality of reflection elements, and the light emitted from the second light source is reflected by the reflection control surface, and a light distribution pattern corresponding to the tilted state of the plurality of reflection elements. It is characterized by including a light distribution pattern forming unit that emits light having the above, a projection lens through which light reflected by the first reflector and light emitted from the light distribution pattern forming unit are transmitted.
　この車両用前照灯では、第１リフレクタで反射した光、及び配光パターン形成部から出射する光が投影レンズを介して出射する。このため、この車両用前照灯は、これら光によって特定の配光パターンを形成できる。また、この車両用前照灯は、複数の反射素子の傾倒状態を制御することで、配光パターン形成部から出射する光の配光パターンを変更できる。このため、この車両用前照灯は、出射する光によって形成する特定の配光パターンを変更することができる。ここで、一般的に、光を反射する反射素子は、光を出射する発光素子よりも小さくし易い傾向にある。従って、この車両用前照灯は、配光パターン形成部が複数の発光素子のそれぞれの点灯と消灯とを制御することで出射する光の配光パターンを変化させる場合と比べて、車両用前照灯から出射する光の配光パターンの変化における精細度を向上し得る。 In this vehicle headlight, the light reflected by the first reflector and the light emitted from the light distribution pattern forming portion are emitted through the projection lens. Therefore, this vehicle headlight can form a specific light distribution pattern by these lights. Further, in this vehicle headlight, the light distribution pattern of the light emitted from the light distribution pattern forming unit can be changed by controlling the tilted state of the plurality of reflecting elements. Therefore, the vehicle headlight can change a specific light distribution pattern formed by the emitted light. Here, in general, a reflecting element that reflects light tends to be smaller than a light emitting element that emits light. Therefore, this vehicle headlight is different from the case where the light distribution pattern forming unit changes the light distribution pattern of the emitted light by controlling the lighting and extinguishing of each of the plurality of light emitting elements. It is possible to improve the definition in the change of the light distribution pattern of the light emitted from the illuminating lamp.
　上記車両用前照灯は、前記第２光源から出射する光を反射して前記反射制御面に集光させる第２リフレクタを更に備えることとしてもよい。 The vehicle headlight may further include a second reflector that reflects the light emitted from the second light source and condenses it on the reflection control surface.
　このような構成にすることで、車両用前照灯が第２リフレクタを備えない場合と比べて、第２光源から出射して反射制御面に照射される光量を増加させることができ、エネルギー効率を向上し得る。 With such a configuration, it is possible to increase the amount of light emitted from the second light source and radiated to the reflection control surface as compared with the case where the vehicle headlight does not have the second reflector, which is energy efficient. Can be improved.
　車両用前照灯が第２リフレクタを備える場合、前記第１リフレクタは、上方側から前記第１光源に被さるように配置され、前記第２光源及び第２リフレクタは、前記第１リフレクタよりも下方に配置され、前記配光パターン形成部は、前記第２光源よりも上方かつ前記第１リフレクタよりも下方に配置されることとしてもよい。 When the vehicle headlight includes a second reflector, the first reflector is arranged so as to cover the first light source from above, and the second light source and the second reflector are below the first reflector. The light distribution pattern forming portion may be arranged above the second light source and below the first reflector.
　車両用前照灯が第２リフレクタを備える場合、上記車両用前照灯は、前記第２光源が実装される基板を更に備え、前記第１リフレクタの反射面は、前記基板の前記第２光源側の面を含む基準面よりも前記第２光源側と反対側に位置することとしてもよい。 When the vehicle headlight includes a second reflector, the vehicle headlight further includes a substrate on which the second light source is mounted, and the reflective surface of the first reflector is the second light source of the substrate. It may be located on the side opposite to the second light source side with respect to the reference surface including the side surface.
　一般的に、基板に実装される光源から出射する光は、主に基板の光源側の面を含む基準面より光源側の領域に伝搬する。このため、この車両用前照灯では、第２光源から出射する光は、当該第２光源が実装される基板の第２光源側の面を含む面より第２光源側の領域に伝搬する。また、上記のように、第１リフレクタの反射面は、この基準面よりも第２光源側と反対側に位置する。このため、この車両用前照灯は、第１リフレクタの反射面の少なくとも一部が上記の基準面よりも第２光源側に位置する場合と比べて、第２光源から出射する光の一部が第１リフレクタの反射面に入射することを抑制し得る。このため、この車両用前照灯は、第２光源から出射する光の一部が第１リフレクタの反射面で反射して迷光となることを抑制し得、意図しない光が出射したり、迷光によって意図しない部材が加熱されたりすることを抑制し得る。 Generally, the light emitted from the light source mounted on the substrate propagates mainly to the region on the light source side from the reference surface including the surface on the light source side of the substrate. Therefore, in this vehicle headlight, the light emitted from the second light source propagates to the region on the second light source side from the surface including the surface on the second light source side of the substrate on which the second light source is mounted. Further, as described above, the reflection surface of the first reflector is located on the side opposite to the second light source side with respect to the reference surface. Therefore, this vehicle headlight is a part of the light emitted from the second light source as compared with the case where at least a part of the reflection surface of the first reflector is located on the second light source side of the above reference surface. Can be suppressed from being incident on the reflecting surface of the first reflector. Therefore, this vehicle headlight can suppress that a part of the light emitted from the second light source is reflected by the reflecting surface of the first reflector to become stray light, and unintended light is emitted or stray light is emitted. It is possible to prevent unintended members from being heated.
　車両用前照灯が第２リフレクタを備える場合、前記第２リフレクタは、前記投影レンズと前記第２光源との間の領域全体を横切ることとしてもよい。 When the vehicle headlight includes a second reflector, the second reflector may traverse the entire region between the projection lens and the second light source.
　このような構成にすることで、第２光源から出射する光が直接投影レンズに入射することを抑制し得、意図しない光が出射することを抑制し得る。 With such a configuration, it is possible to suppress the light emitted from the second light source from directly incident on the projection lens, and it is possible to suppress the emission of unintended light.
　前記投影レンズの入射面における前記配光パターン形成部から出射する光が入射する第１入射領域と、前記第１リフレクタで反射した光が入射する第２入射領域と、が互いに重ならないこととしてもよい。 Even if the first incident region where the light emitted from the light distribution pattern forming portion on the incident surface of the projection lens is incident and the second incident region where the light reflected by the first reflector is incident do not overlap with each other. Good.
　配光パターン形成部から出射する光と第１リフレクタで反射した光とは互いに異なる位置から出射するため、これら光の投影レンズへの入射角は異なり得る。このため、これら光が投影レンズの入射面の同じ領域に入射する場合、当該領域における入射面の設計が難しくなる傾向にある。しかし、この車両用前照灯では、これら光が投影レンズの入射面の互いに異なる領域に入射するため、投影レンズの設計を容易にし得る。 Since the light emitted from the light distribution pattern forming portion and the light reflected by the first reflector are emitted from different positions, the incident angles of these lights on the projection lens may be different. Therefore, when these lights are incident on the same region of the incident surface of the projection lens, it tends to be difficult to design the incident surface in the region. However, in this vehicle headlight, since these lights are incident on different regions of the incident surface of the projection lens, the design of the projection lens can be facilitated.
　以上のように本発明によれば、出射する光の配光パターンの変化における精細度を向上し得る車両用前照灯を提供できる。 As described above, according to the present invention, it is possible to provide a vehicle headlight capable of improving the definition in the change of the light distribution pattern of the emitted light.
本発明の実施形態における車両用前照灯を概略的に示す図である。It is a figure which shows schematicly the headlight for a vehicle in embodiment of this invention. 配光パターン形成部の断面を概略的に示す図である。It is a figure which shows schematic cross section of the light distribution pattern forming part. 反射部の一部の断面を概略的に示す図である。It is a figure which shows roughly the cross section of a part of the reflection part. 投影レンズを概略的に示す正面図である。It is a front view which shows the projection lens schematicly. ロービームの配光パターンを示す図である。It is a figure which shows the light distribution pattern of a low beam. ハイビームの配光パターンを示す図である。It is a figure which shows the light distribution pattern of a high beam.
　以下、本発明に係る車両用前照灯を実施するための形態が添付図面とともに例示される。以下に例示する実施形態は、本発明の理解を容易にするためのものであり、本発明を限定して解釈するためのものではない。本発明は、その趣旨を逸脱することなく、以下の実施形態から変更、改良することができる。 Hereinafter, a mode for implementing the vehicle headlight according to the present invention will be illustrated together with the attached drawings. The embodiments illustrated below are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. The present invention can be modified or improved from the following embodiments without departing from the spirit of the present invention.
　図１は、本発明の実施形態における車両用前照灯を概略的に示す図であり、車両用前照灯の鉛直方向の断面を概略的に示す図である。本実施形態の車両用前照灯１は自動車用の前照灯とされる。自動車用の前照灯は、一般的に車両の前方の左右方向のそれぞれに備えられるものであり、左右の前照灯は左右方向に概ね対称の構成とされる。従って、本実施形態では、一方の前照灯について説明する。図１に示すように、本実施形態の車両用前照灯１は、筐体１０と、灯具ユニット２０とを主な構成として備える。 FIG. 1 is a diagram schematically showing a vehicle headlight according to an embodiment of the present invention, and is a diagram schematically showing a vertical cross section of the vehicle headlight. The vehicle headlight 1 of the present embodiment is a vehicle headlight. Headlights for automobiles are generally provided in each of the left and right directions in front of the vehicle, and the left and right headlights are configured to be substantially symmetrical in the left and right directions. Therefore, in the present embodiment, one of the headlights will be described. As shown in FIG. 1, the vehicle headlight 1 of the present embodiment includes a housing 10 and a lamp unit 20 as main configurations.
　筐体１０は、ランプハウジング１１、フロントカバー１２及びバックカバー１３を主な構成として備える。ランプハウジング１１の前方は開口しており、当該開口を塞ぐようにフロントカバー１２がランプハウジング１１に固定されている。また、ランプハウジング１１の後方には前方よりも小さな開口が形成されており、当該開口を塞ぐようにバックカバー１３がランプハウジング１１に固定されている。 The housing 10 includes a lamp housing 11, a front cover 12, and a back cover 13 as main configurations. The front of the lamp housing 11 has an opening, and the front cover 12 is fixed to the lamp housing 11 so as to close the opening. Further, an opening smaller than the front is formed behind the lamp housing 11, and the back cover 13 is fixed to the lamp housing 11 so as to close the opening.
　ランプハウジング１１と、当該ランプハウジング１１の前方の開口を塞ぐフロントカバー１２と、当該ランプハウジング１１の後方の開口を塞ぐバックカバー１３とによって形成される空間は灯室Ｒであり、この灯室Ｒ内に灯具ユニット２０が収容されている。 The space formed by the lamp housing 11, the front cover 12 that closes the front opening of the lamp housing 11, and the back cover 13 that closes the rear opening of the lamp housing 11 is a light chamber R, and the light room R is The lamp unit 20 is housed inside.
　本実施形態の灯具ユニット２０は、ヒートシンク３０と、冷却ファン３５と、第１光源４１と、第２光源４２と、第１リフレクタ５０と、導光部材としての第２リフレクタ６０と、配光パターン形成部７０と、投影レンズ８０とを主な構成として備え、不図示の構成により筐体１０に固定されている。 The lamp unit 20 of the present embodiment includes a heat sink 30, a cooling fan 35, a first light source 41, a second light source 42, a first reflector 50, a second reflector 60 as a light guide member, and a light distribution pattern. The forming portion 70 and the projection lens 80 are mainly provided, and are fixed to the housing 10 by a configuration (not shown).
　本実施形態のヒートシンク３０は金属製の部材とされ、第１ベース板３１と、第２ベース板３２と、第３ベース板３３と、複数の放熱フィン３４とを有する。第１ベース板３１は、前後及び左右に延在する板状の金属部材である。第２ベース板３２は、前方斜め下方及び左右に延在する板状の金属部材である。第３ベース板３３は、上下及び左右に延在する板状の金属部材である。第２ベース板３２は、第１ベース板３１よりも下方に配置されている。第３ベース板３３の上端部は第１ベース板３１の前端部に接続され、第３ベース板３３の下端部は第２ベース板３２の後端部に接続されている。また、第１ベース板３１の前端部には、当該第１ベース板３１の上面から上方に突出するシェード３６が設けられている。 The heat sink 30 of the present embodiment is made of a metal member, and has a first base plate 31, a second base plate 32, a third base plate 33, and a plurality of heat radiation fins 34. The first base plate 31 is a plate-shaped metal member extending back and forth and left and right. The second base plate 32 is a plate-shaped metal member extending diagonally downwardly forward and to the left and right. The third base plate 33 is a plate-shaped metal member extending vertically and horizontally. The second base plate 32 is arranged below the first base plate 31. The upper end of the third base plate 33 is connected to the front end of the first base plate 31, and the lower end of the third base plate 33 is connected to the rear end of the second base plate 32. Further, a shade 36 that protrudes upward from the upper surface of the first base plate 31 is provided at the front end portion of the first base plate 31.
　それぞれの放熱フィン３４は、第２ベース板３２及び第３ベース板３３の後方に配置され、左右及び前後に延在する板状の金属部材である。それぞれの放熱フィン３４の前端部は、第２ベース板３２または第３ベース板３３に接続される。そして、第１ベース板３１、第２ベース板３２、第３ベース板３３、及び複数の放熱フィン３４は一体に形成されている。冷却ファン３５は放熱フィン３４と隙間を隔てて配置され、ヒートシンク３０に固定されている。この冷却ファン３５の回転による気流によりヒートシンク３０は冷却される。 Each of the heat radiating fins 34 is a plate-shaped metal member arranged behind the second base plate 32 and the third base plate 33 and extending to the left, right, front and back. The front end of each heat radiation fin 34 is connected to the second base plate 32 or the third base plate 33. The first base plate 31, the second base plate 32, the third base plate 33, and the plurality of heat radiation fins 34 are integrally formed. The cooling fan 35 is arranged with a gap from the heat radiation fin 34 and is fixed to the heat sink 30. The heat sink 30 is cooled by the air flow generated by the rotation of the cooling fan 35.
　第１光源４１は、光を出射する発光素子とされ、本実施形態では光を出射する出射面が概ね長方形で白色の拡散光を出射する表面実装型のＬＥＤ（Light Emitting Diode）とされる。第１光源４１は第１基板４５に実装される。この第１基板４５はヒートシンク３０における第１ベース板３１の上面に載置される。この第１基板４５は、第１ベース板３１に設けられるシェード３６よりも後方に位置する。このため、第１基板４５に実装される第１光源４１は、シェード３６よりも後方に位置している。この第１光源４１の出射面は上方を向いており、第１光源４１の光軸４１ａは第１光源４１から概ね鉛直に延在して第１基板４５と概ね垂直である。そして、第１光源４１は上方側に向かって光を出射する。 The first light source 41 is a light emitting element that emits light, and in the present embodiment, it is a surface mount type LED (Light Emitting Diode) that emits white diffused light with a substantially rectangular exit surface. The first light source 41 is mounted on the first substrate 45. The first substrate 45 is placed on the upper surface of the first base plate 31 in the heat sink 30. The first substrate 45 is located behind the shade 36 provided on the first base plate 31. Therefore, the first light source 41 mounted on the first substrate 45 is located behind the shade 36. The exit surface of the first light source 41 faces upward, and the optical axis 41a of the first light source 41 extends substantially vertically from the first light source 41 and is substantially perpendicular to the first substrate 45. Then, the first light source 41 emits light toward the upper side.
　第２光源４２は、第１光源４１と同様に、光を出射する発光素子とされ、本実施形態では光を出射する出射面が概ね長方形で白色の拡散光を出射する表面実装型のＬＥＤとされる。第２光源４２は第２基板４６に実装される。この第２基板４６はヒートシンク３０における第２ベース板３２の前面に載置され、第２光源４２の出射面は前方かつ上方を向いている。この第２光源４２の光軸４２ａは第２光源４２から前方斜め上方に延在しており、第２基板４６と概ね垂直である。そして、第２光源４２は前方側に向かって光を出射する。なお、第１光源４１及び第２光源４２の数や種類は特に限定されるものではなく、例えば、これら光源４１，４２はレーザ光を出射するレーザ素子とされてもよい。 Like the first light source 41, the second light source 42 is a light emitting element that emits light, and in the present embodiment, the second light source 42 is a surface mount type LED that emits white diffused light with a substantially rectangular exit surface. Will be done. The second light source 42 is mounted on the second substrate 46. The second substrate 46 is placed on the front surface of the second base plate 32 of the heat sink 30, and the exit surface of the second light source 42 faces forward and upward. The optical axis 42a of the second light source 42 extends obliquely forward and upward from the second light source 42, and is substantially perpendicular to the second substrate 46. Then, the second light source 42 emits light toward the front side. The number and types of the first light source 41 and the second light source 42 are not particularly limited, and for example, these light sources 41 and 42 may be laser elements that emit laser light.
　第１リフレクタ５０は、第１光源４１から出射する光を反射する部材である。本実施形態の第１リフレクタ５０は、曲面状の板状部材とされ、上方側から第１光源４１に被さるように配置され、ヒートシンク３０における第１ベース板３１に固定されている。この第１リフレクタ５０は、第２光源４２よりも上方に位置している。つまり、第２光源は第１リフレクタ５０よりも下方に配置されている。第１リフレクタ５０の第１光源４１側の面が第１光源４１から出射する光を反射する反射面５０ｒとされる。この反射面５０ｒは、回転楕円曲面を基調としており、この楕円曲面の第１焦点或いは第１焦点近傍に第１光源４１が位置し、この楕円曲面の第２焦点或いは第２焦点近傍に第１ベース板３１に設けられるシェード３６の上端部が位置している。そして、第１光源４１から出射する光は、主にこの反射面５０ｒによって前方へ向けて反射される。また、この反射面５０ｒは、第２光源４２が実装される第２基板４６の第２光源４２側の面を含む基準面ＲＰ１よりも第２光源４２側と反対側である後方側に位置している。 The first reflector 50 is a member that reflects the light emitted from the first light source 41. The first reflector 50 of the present embodiment is a curved plate-shaped member, is arranged so as to cover the first light source 41 from above, and is fixed to the first base plate 31 of the heat sink 30. The first reflector 50 is located above the second light source 42. That is, the second light source is arranged below the first reflector 50. The surface of the first reflector 50 on the side of the first light source 41 is a reflecting surface 50r that reflects the light emitted from the first light source 41. The reflecting surface 50r is based on a rotating elliptic surface, and the first light source 41 is located near the first focal point or the first focal point of the elliptic surface, and the first light source 41 is located near the second focal point or the second focal point of the elliptic surface. The upper end of the shade 36 provided on the base plate 31 is located. Then, the light emitted from the first light source 41 is mainly reflected forward by the reflecting surface 50r. Further, the reflecting surface 50r is located on the rear side opposite to the second light source 42 side with respect to the reference surface RP1 including the surface on the second light source 42 side of the second substrate 46 on which the second light source 42 is mounted. ing.
　導光部材としての第２リフレクタ６０は、第２光源４２から出射する光を後述する配光パターン形成部７０に導光する部材であり、第２光源４２から出射する光を反射面６０ｒによって配光パターン形成部７０に向けて反射するように構成される。 The second reflector 60 as a light guide member is a member that guides the light emitted from the second light source 42 to the light distribution pattern forming unit 70 described later, and distributes the light emitted from the second light source 42 by the reflecting surface 60r. It is configured to reflect toward the light pattern forming unit 70.
　本実施形態の第２リフレクタ６０は、曲面状の板状部材とされ、第１リフレクタ５０よりも下方において、前方側から第２光源４２に被さるように配置される。第２リフレクタ６０における第２光源４２側の面が第２光源４２から出射する光を反射する反射面６０ｒとされる。この反射面６０ｒは第２光源４２側と反対側に凹状となるように湾曲し、例えば、回転楕円曲面を基調とする曲面とされる。そして、反射面６０ｒは、第２光源４２から出射する光を集光して配光パターン形成部７０に照射するように構成される。 The second reflector 60 of the present embodiment is a curved plate-shaped member, and is arranged below the first reflector 50 so as to cover the second light source 42 from the front side. The surface of the second reflector 60 on the side of the second light source 42 is a reflecting surface 60r that reflects the light emitted from the second light source 42. The reflecting surface 60r is curved so as to be concave on the side opposite to the second light source 42 side, and is, for example, a curved surface based on a rotating elliptic curved surface. The reflecting surface 60r is configured to collect the light emitted from the second light source 42 and irradiate the light distribution pattern forming unit 70.
　図２は、配光パターン形成部７０の断面を概略的に示す図であり、配光パターン形成部７０の鉛直方向の断面を概略的に示す図である。本実施形態の配光パターン形成部７０は、所謂ＤＭＤとされる。図２に示すように、配光パターン形成部７０は、反射部７１と、縁部カバー７２と、保護カバー７３とを主な構成として備える。なお、図２では反射部７１の内部の記載が省略されている。反射部７１は、入射する光を反射する反射制御面７１Ｓを有し、この反射制御面７１Ｓによって反射する光によって所定の配光パターンを形成するように構成される。本実施形態では、反射部７１は、正面視において概ね長方形に形成され、正面視における全領域が反射制御面７１Ｓとされている。縁部カバー７２は、反射部７１の側面の全周及び反射制御面７１Ｓと反対側を覆っている。保護カバー７３は、透光性を有する板状部材とされ、反射制御面７１Ｓを覆うように縁部カバー７２に固定される。 FIG. 2 is a diagram schematically showing a cross section of the light distribution pattern forming portion 70, and is a diagram schematically showing a cross section of the light distribution pattern forming portion 70 in the vertical direction. The light distribution pattern forming unit 70 of the present embodiment is a so-called DMD. As shown in FIG. 2, the light distribution pattern forming portion 70 includes a reflecting portion 71, an edge cover 72, and a protective cover 73 as main configurations. In FIG. 2, the description inside the reflection unit 71 is omitted. The reflection unit 71 has a reflection control surface 71S that reflects incident light, and is configured to form a predetermined light distribution pattern by the light reflected by the reflection control surface 71S. In the present embodiment, the reflection portion 71 is formed to be substantially rectangular in the front view, and the entire region in the front view is the reflection control surface 71S. The edge cover 72 covers the entire circumference of the side surface of the reflection portion 71 and the side opposite to the reflection control surface 71S. The protective cover 73 is a plate-shaped member having translucency, and is fixed to the edge cover 72 so as to cover the reflection control surface 71S.
　配光パターン形成部７０は第３基板４７に実装される。この第３基板４７は、ヒートシンク３０における第３ベース板３３の前面に載置される。このため、第１光源４１が実装される第１基板４５、第２光源４２が実装される第２基板４６、及び配光パターン形成部７０が実装される第３基板４７が１つのヒートシンク３０に載置されている。この第３基板４７に実装される配光パターン形成部７０は、第２光源４２よりも後方及び上方かつ第１リフレクタ５０よりも下方に位置している。また、保護カバー７３の面７３Ｓは概ね鉛直かつ左右方向に延在している。そして、反射制御面７１Ｓで反射した光は、保護カバー７３を介して配光パターン形成部７０から前方へ向けて出射する。このため、保護カバー７３の反射制御面７１Ｓ側と反対側の面７３Ｓは、配光パターン形成部７０における入射面及び出射面である。なお、縁部カバー７２は特に限定されるものではなく、例えば反射部７１の背面側を覆っていなくてもよい。また、配光パターン形成部７０は縁部カバー７２や保護カバー７３を備えなくてもよい。 The light distribution pattern forming unit 70 is mounted on the third substrate 47. The third substrate 47 is placed on the front surface of the third base plate 33 in the heat sink 30. Therefore, the first substrate 45 on which the first light source 41 is mounted, the second substrate 46 on which the second light source 42 is mounted, and the third substrate 47 on which the light distribution pattern forming unit 70 is mounted are combined into one heat sink 30. It is placed. The light distribution pattern forming portion 70 mounted on the third substrate 47 is located behind and above the second light source 42 and below the first reflector 50. Further, the surface 73S of the protective cover 73 extends substantially vertically and in the left-right direction. Then, the light reflected by the reflection control surface 71S is emitted forward from the light distribution pattern forming portion 70 via the protective cover 73. Therefore, the surface 73S of the protective cover 73 opposite to the reflection control surface 71S side is an incident surface and an exit surface of the light distribution pattern forming portion 70. The edge cover 72 is not particularly limited, and may not cover the back surface side of the reflective portion 71, for example. Further, the light distribution pattern forming portion 70 does not have to include the edge cover 72 and the protective cover 73.
　図３は、反射部７１の一部の断面を概略的に示す図であり、反射部７１の一部の鉛直方向の断面を概略的に示す図である。本実施形態の反射部７１は、図示せぬ基板に二次元配列される複数の反射素子７４を有し、反射部７１の反射制御面７１Ｓはこれら複数の反射素子７４の反射面７４ｒによって構成されている。複数の反射素子７４は、上記の基板に回転軸７４ａを中心として個別に傾倒可能に支持される。この複数の反射素子７４は、一方側に所定の角度傾倒する第１傾倒状態と他方側に上記所定の角度と同じ角度だけ傾倒する第２傾倒状態とに、それぞれ個別に切り替え可能とされている。本実施形態では、複数の反射素子７４の回転軸７４ａは、互いに概ね平行とされており、それぞれの反射素子７４は、第１傾倒状態において反射面７４ｒに入射する第２光源４２からの光を第１方向に向けて反射する。一方、それぞれの反射素子７４は、第２傾倒状態において反射面７４ｒに入射する第２光源４２からの光を第１方向と異なる第２方向に向けて反射する。なお、複数の反射素子７４は、第１傾倒状態において反射面７４ｒに入射する第２光源からの光を第１方向に向けて反射することができればよい。例えば、複数の反射素子７４は、第１方向と異なる第２方向が互いに異なるような複数の反射素子を含んでいてもよい。つまり、複数の反射素子７４の回転軸７４ａは、互いに非平行とされていてもよい。 FIG. 3 is a diagram schematically showing a cross section of a part of the reflecting portion 71, and is a diagram schematically showing a cross section of a part of the reflecting portion 71 in the vertical direction. The reflection unit 71 of the present embodiment has a plurality of reflection elements 74 two-dimensionally arranged on a substrate (not shown), and the reflection control surface 71S of the reflection unit 71 is composed of the reflection surfaces 74r of the plurality of reflection elements 74. ing. The plurality of reflecting elements 74 are individually tiltably supported on the above-mentioned substrate about the rotation shaft 74a. The plurality of reflecting elements 74 can be individually switched between a first tilted state in which one side is tilted by a predetermined angle and a second tilted state in which the other side is tilted by the same angle as the predetermined angle. .. In the present embodiment, the rotation axes 74a of the plurality of reflecting elements 74 are substantially parallel to each other, and each reflecting element 74 receives light from the second light source 42 incident on the reflecting surface 74r in the first tilted state. It reflects in the first direction. On the other hand, each of the reflecting elements 74 reflects the light from the second light source 42 incident on the reflecting surface 74r in the second tilted state in a second direction different from the first direction. It is sufficient that the plurality of reflecting elements 74 can reflect the light from the second light source incident on the reflecting surface 74r in the first tilted state toward the first direction. For example, the plurality of reflecting elements 74 may include a plurality of reflecting elements having different second directions from the first direction. That is, the rotation axes 74a of the plurality of reflecting elements 74 may be non-parallel to each other.
　反射部７１には不図示の反射部駆動回路が接続され、この反射部駆動回路によるそれぞれの反射素子７４に対する印加電圧に応じてそれぞれの反射素子７４の傾倒状態が切り換えられる。なお、複数の反射素子７４の傾倒状態が当該複数の反射素子７４の反射面７４ｒが同一平面上に位置する状態とされる場合の反射制御面７１Ｓは、保護カバー７３の面７３Ｓと概ね平行である。 A reflection unit drive circuit (not shown) is connected to the reflection unit 71, and the tilted state of each reflection element 74 is switched according to the voltage applied to each reflection element 74 by the reflection unit drive circuit. When the tilting state of the plurality of reflecting elements 74 is such that the reflecting surfaces 74r of the plurality of reflecting elements 74 are located on the same plane, the reflection control surface 71S is substantially parallel to the surface 73S of the protective cover 73. is there.
　このような配光パターン形成部７０は、反射部７１の複数の反射素子７４の傾倒状態を制御することで、反射制御面７１Ｓから第１方向に向けて出射する光によって所定の配光パターンを形成でき、この配光パターンを変更できる。また、配光パターン形成部７０は、反射素子７４の傾倒状態を経時的に制御することで、所定の配光パターンにおける光の強度分布を所定の強度分布にできる。つまり、配光パターン形成部７０は、複数の反射素子７４の傾倒状態に応じる配光パターンを有する光を出射すると理解できる。なお、反射制御面７１Ｓによって第２方向に向けて反射される光の多くは、不図示の光吸収部材によって熱に変換される。 By controlling the tilted state of the plurality of reflecting elements 74 of the reflecting unit 71, such a light distribution pattern forming unit 70 creates a predetermined light distribution pattern by the light emitted from the reflection control surface 71S in the first direction. It can be formed and this light distribution pattern can be changed. Further, the light distribution pattern forming unit 70 can set the light intensity distribution in the predetermined light distribution pattern to a predetermined intensity distribution by controlling the tilted state of the reflecting element 74 over time. That is, it can be understood that the light distribution pattern forming unit 70 emits light having a light distribution pattern corresponding to the tilted state of the plurality of reflecting elements 74. Most of the light reflected in the second direction by the reflection control surface 71S is converted into heat by a light absorbing member (not shown).
　投影レンズ８０は、入射する光の発散角を調節するレンズである。投影レンズ８０は、第１光源４１、第１リフレクタ５０、及び配光パターン形成部７０よりも前方に配置される。第１光源４１から出射して第１リフレクタ５０で反射した光、及び配光パターン形成部７０から出射する所定の配光パターンを有する光が投影レンズ８０に入射し、これら光の発散角が投影レンズ８０で調整される。このように投影レンズ８０で発散角が調整されたこれら光がフロントカバー１２を介して車両用前照灯１から出射する。本実施形態では、投影レンズ８０は、入射面８０ｉ及び出射面８０ｏが凸状に形成されたレンズとされる。投影レンズ８０の光軸８０ａは、配光パターン形成部７０における反射制御面７１Ｓを通り、投影レンズ８０の後方焦点は、反射制御面７１Ｓ上またはその近傍に位置している。また、投影レンズ８０の光軸８０ａは、反射制御面７１Ｓと概ね垂直である。この投影レンズ８０の光軸８０ａを基準とする場合、第１光源４１及び第１リフレクタ５０は、この光軸８０ａよりも上方に配置されており、第２光源４２及び第２リフレクタ６０は、この光軸８０ａよりも下方に配置されている。また、投影レンズ８０と第２光源４２との間の領域全体を導光部材としての第２リフレクタ６０が横切っている。なお、投影レンズ８０の上部や下部が切り欠かれてもよい。 The projection lens 80 is a lens that adjusts the divergence angle of incident light. The projection lens 80 is arranged in front of the first light source 41, the first reflector 50, and the light distribution pattern forming unit 70. Light emitted from the first light source 41 and reflected by the first reflector 50 and light having a predetermined light distribution pattern emitted from the light distribution pattern forming unit 70 are incident on the projection lens 80, and the divergence angle of these lights is projected. It is adjusted by the lens 80. These lights whose divergence angles are adjusted by the projection lens 80 are emitted from the vehicle headlight 1 via the front cover 12. In the present embodiment, the projection lens 80 is a lens in which the entrance surface 80i and the exit surface 80o are formed in a convex shape. The optical axis 80a of the projection lens 80 passes through the reflection control surface 71S in the light distribution pattern forming unit 70, and the rear focal point of the projection lens 80 is located on or near the reflection control surface 71S. Further, the optical axis 80a of the projection lens 80 is substantially perpendicular to the reflection control surface 71S. When the optical axis 80a of the projection lens 80 is used as a reference, the first light source 41 and the first reflector 50 are arranged above the optical axis 80a, and the second light source 42 and the second reflector 60 are arranged above the optical axis 80a. It is arranged below the optical axis 80a. Further, the second reflector 60 as a light guide member crosses the entire region between the projection lens 80 and the second light source 42. The upper part and the lower part of the projection lens 80 may be cut out.
　図４は、投影レンズ８０を概略的に示す正面図であり、投影レンズ８０を入射面８０ｉ側から見る図である。図４に示すように、入射面８０ｉは、第１領域８０ｉａと、第２領域８０ｉｂとを含んでいる。なお、図４において、第２領域８０ｉｂにはハッチングが施されている。第１領域８０ｉａは、第２領域８０ｉｂよりも上方側に位置している。つまり、第１領域８０ｉａは、第２領域８０ｉｂよりも第２光源４２側と反対側に位置している。そして、配光パターン形成部７０から出射する所定の配光パターンを有する光は、第１領域８０ｉａ内に入射し、第１光源４１から出射して第１リフレクタ５０で反射した光は、第２領域８０ｉｂ内に入射する。このため、配光パターン形成部７０から出射する所定の配光パターンを有する光が入射する第１入射領域と、第１光源４１から出射して第１リフレクタ５０で反射した光が入射する第２入射領域とが互いに重ならないと理解できる。なお、第１入射領域と第２入射領域とが互いに重なっていてもよい。 FIG. 4 is a front view schematically showing the projection lens 80, and is a view of the projection lens 80 viewed from the incident surface 80i side. As shown in FIG. 4, the incident surface 80i includes a first region 80ia and a second region 80ib. In FIG. 4, the second region 80ib is hatched. The first region 80ia is located above the second region 80ib. That is, the first region 80ia is located on the side opposite to the second light source 42 side with respect to the second region 80ib. Then, the light having a predetermined light distribution pattern emitted from the light distribution pattern forming unit 70 is incident on the first region 80ia, and the light emitted from the first light source 41 and reflected by the first reflector 50 is the second light. It is incident within the region 80ib. Therefore, the first incident region where the light having a predetermined light distribution pattern emitted from the light distribution pattern forming unit 70 is incident, and the second incident region where the light emitted from the first light source 41 and reflected by the first reflector 50 is incident. It can be understood that the incident regions do not overlap with each other. The first incident region and the second incident region may overlap each other.
　ここで、本実施形態では、前述のように第１光源４１は第１ベース板３１に設けられるシェード３６よりも後方に位置しており、このシェード３６は第１光源４１と投影レンズ８０との間に位置している。また、シェード３６の上端部は、配光パターン形成部７０における反射制御面７１Ｓを含む面上またはその近傍に位置している。なお、反射制御面７１Ｓを含む面とは、例えば、複数の反射素子７４の傾倒状態が当該複数の反射素子７４の反射面７４ｒが同一平面上に位置する状態とされる場合の反射制御面７１Ｓを含む平面とされる。このシェード３６は、第１光源４１から出射して第１リフレクタ５０で反射した光の一部を遮る。このため、第１光源４１から出射して第１リフレクタ５０で反射した光は、シェード３６によって制御されて投影レンズ８０を透過する。このため、第１光源４１から出射して投影レンズ８０を透過する光は、第１リフレクタ５０の反射面５０ｒ及びシェード３６の形状に応じた特定の配光パターンを有する光となる。本実施形態では、第１リフレクタ５０の反射面５０ｒ及びシェード３６は、第１光源４１から出射して投影レンズ８０に入射する光の配光パターンがロービームの配光パターンとなるような形状とされる。 Here, in the present embodiment, as described above, the first light source 41 is located behind the shade 36 provided on the first base plate 31, and the shade 36 is a combination of the first light source 41 and the projection lens 80. It is located in between. Further, the upper end portion of the shade 36 is located on or near the surface of the light distribution pattern forming portion 70 including the reflection control surface 71S. The surface including the reflection control surface 71S is, for example, the reflection control surface 71S when the tilting state of the plurality of reflection elements 74 is such that the reflection surfaces 74r of the plurality of reflection elements 74 are located on the same plane. It is a plane containing. The shade 36 blocks a part of the light emitted from the first light source 41 and reflected by the first reflector 50. Therefore, the light emitted from the first light source 41 and reflected by the first reflector 50 is controlled by the shade 36 and passes through the projection lens 80. Therefore, the light emitted from the first light source 41 and transmitted through the projection lens 80 is light having a specific light distribution pattern according to the shapes of the reflecting surface 50r and the shade 36 of the first reflector 50. In the present embodiment, the reflecting surface 50r and the shade 36 of the first reflector 50 are shaped so that the light distribution pattern of the light emitted from the first light source 41 and incident on the projection lens 80 becomes a low beam light distribution pattern. To.
　次に車両用前照灯１の動作について説明する。具体的には、ロービームを出射する動作、及びハイビームを出射する動作について説明する。 Next, the operation of the vehicle headlight 1 will be described. Specifically, the operation of emitting a low beam and the operation of emitting a high beam will be described.
　まず、ロービームを出射する場合について説明する。不図示の電源から第１光源４１に電力を供給し、第１光源４１から白色の光を出射させる。図１に示すように、第１光源４１から出射するこの光は、第１リフレクタ５０の反射面５０ｒで反射し、この反射面５０ｒで反射した光Ｌ１Ａは、その一部がシェード３６で遮蔽され、他の一部が投影レンズ８０を透過する。上記のように、シェード３６は、投影レンズ８０に入射する光の配光パターンがロービームの配光パターンとなるように第１リフレクタ５０の反射面５０ｒで反射した光の一部を遮る。このため、ロービームの配光パターンを有する光が投影レンズ８０を透過し、フロントカバー１２を介して車両用前照灯１から出射される。つまり、車両用前照灯１からロービームが出射される。 First, the case of emitting a low beam will be described. Power is supplied to the first light source 41 from a power source (not shown), and white light is emitted from the first light source 41. As shown in FIG. 1, the light emitted from the first light source 41 is reflected by the reflecting surface 50r of the first reflector 50, and a part of the light L1A reflected by the reflecting surface 50r is shielded by the shade 36. , The other part passes through the projection lens 80. As described above, the shade 36 blocks a part of the light reflected by the reflecting surface 50r of the first reflector 50 so that the light distribution pattern of the light incident on the projection lens 80 becomes the low beam light distribution pattern. Therefore, the light having the low beam light distribution pattern passes through the projection lens 80 and is emitted from the vehicle headlight 1 via the front cover 12. That is, a low beam is emitted from the vehicle headlight 1.
　図５はロービームの配光パターンを示す図である。図５においてＳは水平線を示し、配光パターンが太線で示される。第１リフレクタ５０の反射面５０ｒ及びシェード３６は、第１光源４１から出射して投影レンズ８０に入射する光Ｌ１Ａの配光パターンがこのようなロービームの配光パターンＰＬとなるような形状とされる。 FIG. 5 is a diagram showing a low beam light distribution pattern. In FIG. 5, S indicates a horizontal line, and the light distribution pattern is indicated by a thick line. The reflecting surface 50r and the shade 36 of the first reflector 50 are shaped so that the light distribution pattern of the light L1A emitted from the first light source 41 and incident on the projection lens 80 becomes such a low beam light distribution pattern PL. To.
　次に、ハイビームを出射する場合について説明する。不図示の電源から第１光源４１及び第２光源４２に電力を供給し、第１光源４１及び第２光源４２から白色の光を出射させる。上記のように、第１光源４１から光が出射されることで、車両用前照灯１からロービームが出射される。一方、図１に示すように、第２光源４２から出射する光は、導光部材としての第２リフレクタ６０の反射面６０ｒによって配光パターン形成部７０に向かって反射される。この第２リフレクタ６０の反射面６０ｒで反射した光Ｌ２Ａは、集光して配光パターン形成部７０の反射制御面７１Ｓに照射され、反射制御面７１Ｓによって反射される。本実施形態では、この光Ｌ２Ａは、反射制御面７１Ｓの全面に照射される。配光パターン形成部７０は第１方向に所定の配光パターンを有する光Ｌ２Ｂを出射し、この光Ｌ２Ｂは投影レンズ８０を透過する。そして、ロービームと、所定の配光パターンを有する光Ｌ２Ｂとがフロントカバー１２を介して車両用前照灯１から出射される。 Next, the case of emitting a high beam will be described. Power is supplied to the first light source 41 and the second light source 42 from a power source (not shown), and white light is emitted from the first light source 41 and the second light source 42. As described above, when the light is emitted from the first light source 41, the low beam is emitted from the vehicle headlight 1. On the other hand, as shown in FIG. 1, the light emitted from the second light source 42 is reflected toward the light distribution pattern forming portion 70 by the reflecting surface 60r of the second reflector 60 as a light guide member. The light L2A reflected by the reflection surface 60r of the second reflector 60 is condensed and irradiated to the reflection control surface 71S of the light distribution pattern forming unit 70, and is reflected by the reflection control surface 71S. In the present embodiment, the light L2A is applied to the entire surface of the reflection control surface 71S. The light distribution pattern forming unit 70 emits light L2B having a predetermined light distribution pattern in the first direction, and the light L2B passes through the projection lens 80. Then, the low beam and the light L2B having a predetermined light distribution pattern are emitted from the vehicle headlight 1 via the front cover 12.
　図６はハイビームの配光パターンを示す図である。図６においてＳは水平線を示す。図６に示すように、ハイビームの配光パターンＰＨは、ロービームの配光パターンＰＬと、光Ｌ２Ｂによって形成される所定の配光パターンＰＴ１によって形成される。なお、図６において、ハイビームの配光パターンＰＨの輪郭は太線で示され、ロービームの配光パターンＰＬの輪郭は一点鎖線で示され、所定の配光パターンＰＴ１の輪郭は点線で示されている。また、ロービームの配光パターンＰＬの輪郭及び所定の配光パターンＰＴ１の輪郭のうち、ハイビームの配光パターンＰＨの輪郭と重なる部位は、ハイビームの配光パターンＰＨの輪郭からずらして示されている。 FIG. 6 is a diagram showing a high beam light distribution pattern. In FIG. 6, S indicates a horizontal line. As shown in FIG. 6, the high beam light distribution pattern PH is formed by the low beam light distribution pattern PL and the predetermined light distribution pattern PT1 formed by the light L2B. In FIG. 6, the outline of the high beam light distribution pattern PH is shown by a thick line, the outline of the low beam light distribution pattern PL is shown by a long-dotted line, and the outline of the predetermined light distribution pattern PT1 is shown by a dotted line. .. Further, among the contour of the low beam light distribution pattern PL and the contour of the predetermined light distribution pattern PT1, the portion overlapping the contour of the high beam light distribution pattern PH is shown offset from the contour of the high beam light distribution pattern PH. ..
　図６に示すように、ハイビームの配光パターンＰＨのうち上部は所定の配光パターンＰＴ１によって形成され、下部はロービームの配光パターンＰＬによって形成される。所定の配光パターンＰＴ１の下部とロービームの配光パターンＰＬの上部とは互いに重なっている。つまり、配光パターン形成部７０における反射部７１の複数の反射素子の傾倒状態は、このような所定の配光パターンＰＴ１が形成されるように制御される。 As shown in FIG. 6, the upper part of the high beam light distribution pattern PH is formed by the predetermined light distribution pattern PT1, and the lower part is formed by the low beam light distribution pattern PL. The lower part of the predetermined light distribution pattern PT1 and the upper part of the low beam light distribution pattern PL overlap each other. That is, the tilted state of the plurality of reflecting elements of the reflecting unit 71 in the light distribution pattern forming unit 70 is controlled so that such a predetermined light distribution pattern PT1 is formed.
　本実施形態の車両用前照灯１は、上記のように、ロービームと、所定の配光パターンＰＴ１を有する光Ｌ２Ｂを出射する。そして、これら光によってハイビームの配光パターンＰＨが形成され、車両用前照灯１からハイビームが出射される。このように出射されるハイビームの配光パターンＰＨの一部は、配光パターン形成部７０から出射する光Ｌ２Ｂを含む光によって形成される。このため、ハイビームの配光パターンＰＨのうちこの光Ｌ２Ｂを含む光によって形成される領域であり、図５における所定の配光パターンＰＴ１と重なる領域の配光パターンを変更することができる。従って、例えば、車両前方の状況に応じてこの領域の配光パターンを変更することができ、車両用前照灯１から出射するハイビームをＡＤＢ（Adaptive Driving Beam）とすることができる。なお、所定の配光パターンＰＴ１とロービームの配光パターンＰＬとは互いに重なっていなくてもよい。この場合、所定の配光パターンＰＴ１の下側の縁とロービームの配光パターンＰＬの上側の縁が接するように、配光パターン形成部７０における反射部７１の複数の反射素子の傾倒状態が制御される。 As described above, the vehicle headlight 1 of the present embodiment emits a low beam and light L2B having a predetermined light distribution pattern PT1. Then, a high beam light distribution pattern PH is formed by these lights, and the high beam is emitted from the vehicle headlight 1. A part of the light distribution pattern PH of the high beam emitted in this way is formed by light including light L2B emitted from the light distribution pattern forming unit 70. Therefore, the light distribution pattern of the region of the high beam light distribution pattern PH formed by the light including the light L2B and overlapping with the predetermined light distribution pattern PT1 in FIG. 5 can be changed. Therefore, for example, the light distribution pattern in this region can be changed according to the situation in front of the vehicle, and the high beam emitted from the vehicle headlight 1 can be an ADB (Adaptive Driving Beam). The predetermined light distribution pattern PT1 and the low beam light distribution pattern PL do not have to overlap each other. In this case, the tilted state of the plurality of reflecting elements of the reflecting portion 71 in the light distribution pattern forming portion 70 is controlled so that the lower edge of the predetermined light distribution pattern PT1 and the upper edge of the low beam light distribution pattern PL are in contact with each other. Will be done.
　以上説明したように、本実施形態の車両用前照灯１は、第１光源４１と、第２光源４２と、第１リフレクタ５０と、配光パターン形成部７０と、投影レンズ８０と、を備える。第１リフレクタ５０は、第１光源４１から出射する光を反射する。配光パターン形成部７０は、傾倒状態を個別に切り替え可能である複数の反射素子７４の反射面７４ｒによって構成される反射制御面７１Ｓを有する。この配光パターン形成部７０は、第２光源４２から出射する光を反射制御面７１Ｓによって反射して複数の反射素子７４の傾倒状態に応じる配光パターンを有する光Ｌ２Ｂを出射する。第１リフレクタ５０で反射した光Ｌ１Ａ、及び配光パターン形成部７０から出射し複数の反射素子７４の傾倒状態に応じる配光パターンである所定の配光パターンＰＴ１を有する光Ｌ２Ｂは、投影レンズを透過する。 As described above, the vehicle headlight 1 of the present embodiment includes a first light source 41, a second light source 42, a first reflector 50, a light distribution pattern forming unit 70, and a projection lens 80. Be prepared. The first reflector 50 reflects the light emitted from the first light source 41. The light distribution pattern forming unit 70 has a reflection control surface 71S composed of reflection surfaces 74r of a plurality of reflection elements 74 whose tilting states can be individually switched. The light distribution pattern forming unit 70 reflects the light emitted from the second light source 42 by the reflection control surface 71S, and emits light L2B having a light distribution pattern corresponding to the tilted state of the plurality of reflecting elements 74. The light L1A reflected by the first reflector 50 and the light L2B having a predetermined light distribution pattern PT1 which is a light distribution pattern emitted from the light distribution pattern forming unit 70 and corresponding to the tilted state of the plurality of reflecting elements 74 can be used as a projection lens. To Penetrate.
　本実施形態の車両用前照灯１では、第１リフレクタ５０で反射した光Ｌ１Ａ、及び所定の配光パターンＰＴ１を有する光Ｌ２Ｂが投影レンズ８０を介して出射する。そして、本実施形態の車両用前照灯１は、これら光Ｌ１Ａ，Ｌ２Ｂによってハイビームの配光パターンＰＨを形成する。また、本実施形態の車両用前照灯１は、複数の反射素子７４の傾倒状態を制御することで、配光パターン形成部７０から出射する光Ｌ２Ｂの所定の配光パターンＰＴ１を変更できる。このため、本実施形態の車両用前照灯１は、出射する光の配光パターンを変更することができ、例えば上記のようにＡＤＢを出射することができる。ここで、一般的に、光を反射する反射素子は、光を出射する発光素子よりも小さくし易い傾向にある。従って、本実施形態の車両用前照灯１は、配光パターン形成部７０が複数の発光素子のそれぞれの点灯と消灯とを制御することで出射する配光パターンを変化させる場合と比べて、ハイビームの配光パターンＰＨの変化における精細度を向上し得る。このため、本実施形態の車両用前照灯１は、例えば運転者がハイビームの配光パターンＰＨの変化に違和感を覚えることを抑制し得る。 In the vehicle headlight 1 of the present embodiment, the light L1A reflected by the first reflector 50 and the light L2B having a predetermined light distribution pattern PT1 are emitted through the projection lens 80. Then, the vehicle headlight 1 of the present embodiment forms a high beam light distribution pattern PH by these lights L1A and L2B. Further, the vehicle headlight 1 of the present embodiment can change a predetermined light distribution pattern PT1 of the light L2B emitted from the light distribution pattern forming unit 70 by controlling the tilted state of the plurality of reflecting elements 74. Therefore, the vehicle headlight 1 of the present embodiment can change the light distribution pattern of the emitted light, and can emit the ADB as described above, for example. Here, in general, a reflecting element that reflects light tends to be smaller than a light emitting element that emits light. Therefore, in the vehicle headlight 1 of the present embodiment, as compared with the case where the light distribution pattern forming unit 70 changes the light distribution pattern emitted by controlling the lighting and extinguishing of each of the plurality of light emitting elements. The definition in the change of the light distribution pattern PH of the high beam can be improved. Therefore, the vehicle headlight 1 of the present embodiment can suppress, for example, the driver from feeling uncomfortable with the change in the light distribution pattern PH of the high beam.
　本実施形態の車両用前照灯１は、第２光源４２から出射する光を反射して反射制御面７１Ｓに集光させる第２リフレクタ６０を更に備える。このため、本実施形態の車両用前照灯１は、当該車両用前照灯１が第２リフレクタ６０を備えない場合と比べて、第２光源４２から出射して反射制御面７１Ｓに照射される光量を増加させることができ、エネルギー効率を向上し得る。 The vehicle headlight 1 of the present embodiment further includes a second reflector 60 that reflects the light emitted from the second light source 42 and condenses it on the reflection control surface 71S. Therefore, the vehicle headlight 1 of the present embodiment emits light from the second light source 42 and irradiates the reflection control surface 71S as compared with the case where the vehicle headlight 1 does not include the second reflector 60. The amount of light emitted can be increased and energy efficiency can be improved.
　本実施形態の車両用前照灯１では、第１リフレクタ５０は、上方側から第１光源４１に被さるように配置される。第２光源４２及び第２リフレクタ６０は、第１リフレクタ５０よりも下方に配置される。配光パターン形成部７０は、第２光源４２よりも上方かつ第１リフレクタ５０よりも下方に配置される。また、第１リフレクタ５０の反射面５０ｒは、第２光源４２が実装される第２基板４６の第２光源４２側の面を含む基準面ＲＰ１よりも第２光源４２側と反対側に位置する。 In the vehicle headlight 1 of the present embodiment, the first reflector 50 is arranged so as to cover the first light source 41 from the upper side. The second light source 42 and the second reflector 60 are arranged below the first reflector 50. The light distribution pattern forming unit 70 is arranged above the second light source 42 and below the first reflector 50. Further, the reflection surface 50r of the first reflector 50 is located on the side opposite to the second light source 42 side with respect to the reference surface RP1 including the surface on the second light source 42 side of the second substrate 46 on which the second light source 42 is mounted. ..
　一般的に、基板に実装される光源から出射する光は、主に基板の光源側の面を含む基準面より光源側の領域に伝搬する。このため、本実施形態の車両用前照灯１では、第２光源４２から出射する光は、当該第２光源４２が実装される第２基板４６の第２光源４２側の面を含む基準面ＲＰ１より第２光源４２側の領域に伝搬する。また、上記のように、第１リフレクタ５０の反射面は、上記の基準面ＲＰ１よりも第２光源４２側と反対側に位置する。このため、本実施形態の車両用前照灯１は、第１リフレクタ５０の反射面５０ｒの少なくとも一部が基準面ＲＰ１よりも第２光源４２側に位置する場合と比べて、第２光源４２から出射する光の一部が第１リフレクタ５０の反射面５０ｒに入射することを抑制し得る。このため、本実施形態の車両用前照灯１は、第２光源４２から出射する光の一部が第１リフレクタ５０の反射面５０ｒで反射して迷光となることを抑制し得、意図しない光が出射したり、迷光によって意図しない部材が加熱されたりすることを抑制し得る。 Generally, the light emitted from the light source mounted on the substrate propagates mainly to the region on the light source side from the reference surface including the surface on the light source side of the substrate. Therefore, in the vehicle headlight 1 of the present embodiment, the light emitted from the second light source 42 is a reference surface including the surface of the second substrate 46 on which the second light source 42 is mounted on the second light source 42 side. It propagates to the region on the second light source 42 side from RP1. Further, as described above, the reflection surface of the first reflector 50 is located on the side opposite to the second light source 42 side with respect to the reference surface RP1. Therefore, in the vehicle headlight 1 of the present embodiment, the second light source 42 is compared with the case where at least a part of the reflection surface 50r of the first reflector 50 is located closer to the second light source 42 than the reference surface RP1. It is possible to suppress that a part of the light emitted from the first reflector 50 is incident on the reflecting surface 50r of the first reflector 50. Therefore, the vehicle headlight 1 of the present embodiment can suppress that a part of the light emitted from the second light source 42 is reflected by the reflecting surface 50r of the first reflector 50 and becomes stray light, which is not intended. It is possible to suppress the emission of light and the heating of unintended members due to stray light.
　本実施形態の車両用前照灯１では、第２リフレクタ６０は、投影レンズ８０と第２光源４２との間の領域全体を横切る。このため、第２光源から出射する光が直接投影レンズに入射することを抑制し得、意図しない光が出射することを抑制し得る。 In the vehicle headlight 1 of the present embodiment, the second reflector 60 crosses the entire region between the projection lens 80 and the second light source 42. Therefore, it is possible to suppress the light emitted from the second light source from directly entering the projection lens, and it is possible to suppress the emission of unintended light.
　本実施形態の車両用前照灯１では、投影レンズ８０の入射面８０ｉにおける配光パターン形成部７０から出射する光Ｌ２Ｂが入射する第１入射領域と、第１リフレクタ５０で反射した光Ｌ１Ａが入射する第２入射領域と、が互いに重ならない。配光パターン形成部７０から出射する光Ｌ２Ｂと第１リフレクタ５０で反射した光Ｌ１Ａとは互いに異なる位置から出射するため、これら光Ｌ２Ｂ，Ｌ１Ａの投影レンズ８０への入射角は異なり得る。このため、これら光Ｌ２Ｂ，Ｌ１Ａが投影レンズ８０の入射面８０ｉの同じ領域に入射する場合、当該領域における入射面８０ｉの設計が難しくなる傾向にある。しかし、本実施形態の車両用前照灯１では、これら光Ｌ２Ｂ，Ｌ１Ａが投影レンズ８０の入射面８０ｉの互いに異なる領域に入射するため、投影レンズ８０の設計を容易にし得る。 In the vehicle headlight 1 of the present embodiment, the first incident region where the light L2B emitted from the light distribution pattern forming portion 70 on the incident surface 80i of the projection lens 80 is incident and the light L1A reflected by the first reflector 50 are formed. The incident second incident region does not overlap with each other. Since the light L2B emitted from the light distribution pattern forming unit 70 and the light L1A reflected by the first reflector 50 are emitted from different positions, the incident angles of these lights L2B and L1A on the projection lens 80 may be different. Therefore, when these lights L2B and L1A are incident on the same region of the incident surface 80i of the projection lens 80, the design of the incident surface 80i in the region tends to be difficult. However, in the vehicle headlight 1 of the present embodiment, since these lights L2B and L1A are incident on different regions of the incident surface 80i of the projection lens 80, the design of the projection lens 80 can be facilitated.
　本実施形態の車両用前照灯１は、第１光源４１が実装される第１基板４５と、第２光源４２が実装される第２基板４６と、配光パターン形成部７０が実装される第３基板４７と、これら基板４５，４６，４７が載置されるヒートシンク３０とを更に備える。このため、これら基板４５，４６，４７が互いに異なるヒートシンクに載置される場合と比べて、部品点数を減少し得る。なお、部品点数を減少する観点では、車両用前照灯１は、これら基板４５，４６，４７の少なくとも２つが載置されるヒートシンクを備えていればよい。 In the vehicle headlight 1 of the present embodiment, the first substrate 45 on which the first light source 41 is mounted, the second substrate 46 on which the second light source 42 is mounted, and the light distribution pattern forming unit 70 are mounted. A third substrate 47 and a heat sink 30 on which these substrates 45, 46, 47 are placed are further provided. Therefore, the number of parts can be reduced as compared with the case where the substrates 45, 46, and 47 are mounted on different heat sinks. From the viewpoint of reducing the number of parts, the vehicle headlight 1 may be provided with a heat sink on which at least two of the substrates 45, 46, and 47 are mounted.
　以上、本発明について、上記実施形態を例に説明したが、本発明はこれらに限定されるものではない。 Although the present invention has been described above by taking the above embodiment as an example, the present invention is not limited thereto.
　例えば、上記実施形態では、車両用前照灯１は、第２光源４２から出射する光を配光パターン形成部７０に導光する導光部材として、第２リフレクタ６０を備えていた。しかし、導光部材は特に限定されるものではない。例えば導光部材がレンズとされ、当該レンズによって第２光源４２から出射する光を配光パターン形成部７０に導光してもよい。また、車両用前照灯１は、このような導光部材を備えていなくてもよい。 For example, in the above embodiment, the vehicle headlight 1 includes a second reflector 60 as a light guide member that guides the light emitted from the second light source 42 to the light distribution pattern forming unit 70. However, the light guide member is not particularly limited. For example, the light guide member may be a lens, and the light emitted from the second light source 42 by the lens may be guided to the light distribution pattern forming unit 70. Further, the vehicle headlight 1 does not have to be provided with such a light guide member.
　また、上記実施形態では、導光部材としての第２リフレクタ６０は、投影レンズ８０よりも後方に位置し、第２光源４２は配光パターン形成部７０よりも前方に位置していた。しかし、第２光源４２から出射する光を第２リフレクタ６０によって配光パターン形成部７０に導光できればよく、第２光源４２及び第２リフレクタ６０の配置は特に限定されるものではない。例えば、上下方向において、投影レンズ８０と第２リフレクタ６０とが重なっていてもよい。また、第２光源４２は配光パターン形成部７０よりも後方に位置していてもよい。 Further, in the above embodiment, the second reflector 60 as the light guide member is located behind the projection lens 80, and the second light source 42 is located in front of the light distribution pattern forming portion 70. However, the arrangement of the second light source 42 and the second reflector 60 is not particularly limited as long as the light emitted from the second light source 42 can be guided to the light distribution pattern forming portion 70 by the second reflector 60. For example, the projection lens 80 and the second reflector 60 may overlap in the vertical direction. Further, the second light source 42 may be located behind the light distribution pattern forming portion 70.
　また、上記実施形態では、車両用前照灯１は、１つのレンズから成る投影レンズ８０を備えていた。しかし、車両用前照灯１が備える投影レンズ８０は、光軸方向に並列される複数のレンズから成るレンズ群とされてもよく、並列される複数のレンズは、凸レンズ、凹レンズ、自由曲面レンズ等のうち複数種類のレンズを含んでいてもよい。 Further, in the above embodiment, the vehicle headlight 1 includes a projection lens 80 composed of one lens. However, the projection lens 80 included in the vehicle headlight 1 may be a lens group composed of a plurality of lenses arranged in parallel in the optical axis direction, and the plurality of arranged lenses are a convex lens, a concave lens, and a free curved lens. And so on, a plurality of types of lenses may be included.
　また、上記実施形態では、ロービームの配光パターンＰＬは、第１光源４１から出射して第１リフレクタ５０で反射した光によって形成されていた。しかし、ロービームの配光パターンＰＬは、例えば、第１光源４１から出射して第１リフレクタ５０で反射した光、及び第１光源４１から出射して第１リフレクタ５０で反射しなかった光によって形成されもよい。また、ロービームの配光パターンＰＬは、第１光源４１から出射して第１リフレクタ５０で反射した光Ｌ１Ｂと、配光パターン形成部７０から出射する光Ｌ２Ｂとを含む光によって形成されてもよい。この場合、配光パターン形成部７０から出射する光Ｌ２Ｂによって、ロービームの配光パターンＰＬのうち、上側の縁であるカットオフラインＣＬの少なくとも一部に接する領域を形成することが好ましく、カットオフラインＣＬの全部に接する領域を形成することがより好ましい。つまり、配光パターン形成部７０における反射部７１の複数の反射素子の傾倒状態は、光Ｌ２Ｂによってこのような領域が形成されるように制御される。このような構成にすることで、シェード３６の形状を簡易な形状とし得る。また、配光パターン形成部７０が複数の発光素子のそれぞれの点灯と消灯とを制御することで出射する配光パターンを変化させる場合と比べて、カットオフラインＣＬの精細度を向上し得る。 Further, in the above embodiment, the low beam light distribution pattern PL is formed by the light emitted from the first light source 41 and reflected by the first reflector 50. However, the low beam light distribution pattern PL is formed by, for example, the light emitted from the first light source 41 and reflected by the first reflector 50, and the light emitted from the first light source 41 and not reflected by the first reflector 50. May be done. Further, the low beam light distribution pattern PL may be formed by light including light L1B emitted from the first light source 41 and reflected by the first reflector 50 and light L2B emitted from the light distribution pattern forming unit 70. .. In this case, it is preferable that the light L2B emitted from the light distribution pattern forming unit 70 forms a region of the low beam light distribution pattern PL that is in contact with at least a part of the cut-off line CL, which is the upper edge. It is more preferable to form a region in contact with all of the above. That is, the tilted state of the plurality of reflecting elements of the reflecting unit 71 in the light distribution pattern forming unit 70 is controlled so that such a region is formed by the light L2B. With such a configuration, the shape of the shade 36 can be made a simple shape. Further, the definition of the cut-off line CL can be improved as compared with the case where the light distribution pattern forming unit 70 changes the light distribution pattern emitted by controlling the lighting and extinguishing of each of the plurality of light emitting elements.
　また、上記実施形態では、シェード３６は、第１ベース板３１の上面から上方に突出していた。しかし、シェード３６は、第１光源４１と投影レンズ８０との間に位置し、第１光源４１から出射して投影レンズ８０に入射する光の一部を遮ればよい。例えば、シェード３６は、第３ベース板３３の前面から前方に突出していてもよい。また、シェード３６は、第１ベース板３１から突出せずに、第１ベース板３１の一部がシェード３６とされてもよい。 Further, in the above embodiment, the shade 36 protrudes upward from the upper surface of the first base plate 31. However, the shade 36 may be located between the first light source 41 and the projection lens 80, and may block a part of the light emitted from the first light source 41 and incident on the projection lens 80. For example, the shade 36 may project forward from the front surface of the third base plate 33. Further, the shade 36 may be a part of the first base plate 31 as the shade 36 without protruding from the first base plate 31.
　本発明によれば、出射する光の配光パターンの変化における精細度を向上し得る車両用前照灯が提供され、自動車等の車両用前照灯などの分野において利用可能である。

  According to the present invention, a vehicle headlight capable of improving the definition in a change in the light distribution pattern of the emitted light is provided, and can be used in a field such as a vehicle headlight such as an automobile.

Claims (6)

  1. 　第１光源と、
    　第２光源と、
    　前記第１光源から出射する光を反射する第１リフレクタと、
    　傾倒状態を個別に切り替え可能である複数の反射素子の反射面によって構成される反射制御面を有し、前記第２光源から出射する光を前記反射制御面によって反射して前記複数の反射素子の傾倒状態に応じる配光パターンを有する光を出射する配光パターン形成部と、
    　前記第１リフレクタで反射した光、及び前記配光パターン形成部から出射する光が透過する投影レンズと、
    を備える
    ことを特徴とする車両用前照灯。     With the first light source
    With the second light source
    A first reflector that reflects light emitted from the first light source,
    It has a reflection control surface composed of the reflection surfaces of a plurality of reflection elements whose tilting states can be individually switched, and the light emitted from the second light source is reflected by the reflection control surface to form the plurality of reflection elements. A light distribution pattern forming unit that emits light having a light distribution pattern according to the tilted state,
    A projection lens through which the light reflected by the first reflector and the light emitted from the light distribution pattern forming portion are transmitted.
    A headlight for a vehicle characterized by being equipped with.
  2. 　前記第２光源から出射する光を反射して前記反射制御面に集光させる第２リフレクタを更に備える
    ことを特徴とする請求項１に記載の車両用前照灯。     The vehicle headlight according to claim 1, further comprising a second reflector that reflects light emitted from the second light source and condenses it on the reflection control surface.
  3. 　前記第１リフレクタは、前記第１光源を上方側から覆うように配置され、
    　前記第２光源、及び第２リフレクタは、前記第１リフレクタよりも下方に配置され、
    　前記配光パターン形成部は、前記第２光源よりも上方かつ前記第１リフレクタよりも下方に配置される
    ことを特徴とする請求項２に記載の車両用前照灯。     The first reflector is arranged so as to cover the first light source from above.
    The second light source and the second reflector are arranged below the first reflector.
    The vehicle headlight according to claim 2, wherein the light distribution pattern forming portion is arranged above the second light source and below the first reflector.
  4. 　前記第２光源が実装される基板を更に備え、
    　前記第１リフレクタの反射面は、前記基板の前記第２光源側の面を含む基準面よりも前記第２光源側と反対側に位置する
    ことを特徴とする請求項２または３に記載の車両用前照灯。     Further provided with a substrate on which the second light source is mounted,
    The vehicle according to claim 2 or 3, wherein the reflecting surface of the first reflector is located on the side opposite to the second light source side of the reference surface including the surface of the substrate on the second light source side. Headlight for use.
  5. 　前記第２リフレクタは、前記投影レンズと前記第２光源との間の領域全体を横切る
    ことを特徴とする請求項２から４のいずれか１項に記載の車両用前照灯。     The vehicle headlight according to any one of claims 2 to 4, wherein the second reflector traverses the entire region between the projection lens and the second light source.
  6. 　前記投影レンズの入射面における前記配光パターン形成部から出射する光が入射する第１入射領域と、前記第１リフレクタで反射した光が入射する第２入射領域とが互いに重ならない
    ことを特徴とする請求項１から５のいずれか１項に記載の車両用前照灯。
     

          The feature is that the first incident region where the light emitted from the light distribution pattern forming portion on the incident surface of the projection lens is incident and the second incident region where the light reflected by the first reflector is incident do not overlap each other. The vehicle headlight according to any one of claims 1 to 5.
PCT/JP2020/026612 2019-07-08 2020-07-07 Vehicular head lamp WO2021006283A1 (en)

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