WO2021171460A1 - Passing-beam headlight - Google Patents

Passing-beam headlight Download PDF

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Publication number
WO2021171460A1
WO2021171460A1 PCT/JP2020/007941 JP2020007941W WO2021171460A1 WO 2021171460 A1 WO2021171460 A1 WO 2021171460A1 JP 2020007941 W JP2020007941 W JP 2020007941W WO 2021171460 A1 WO2021171460 A1 WO 2021171460A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
passing
light guide
guide body
groove
Prior art date
Application number
PCT/JP2020/007941
Other languages
French (fr)
Japanese (ja)
Inventor
誠治 長谷川
極 井上
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2020/007941 priority Critical patent/WO2021171460A1/en
Publication of WO2021171460A1 publication Critical patent/WO2021171460A1/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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/26—Elongated 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
    • F21S41/27—Thick 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
    • F21S41/40—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
    • 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
    • F21S41/47—Attachment thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Definitions

  • This disclosure relates to the passing headlights mounted on the vehicle.
  • the passing headlights mounted on the vehicle are designed not to illuminate the front of the vehicle, but to illuminate any direction other than the direction in which it should be irradiated.
  • a headlight for passing there is a headlight module (hereinafter, referred to as a conventional headlight for passing) as described in Patent Document 1.
  • the conventional passing headlight is equipped with a light source and a light guide body that irradiates the light from the light source to the front of the vehicle. Then, in the conventional headlight for passing each other, the light emitted from the light source and incident on the light guide body is emitted from the exit surface provided on the light guide body. At this time, a part of the light incident on the light guide body linearly heads toward the exit surface after being incident on the light guide body. In addition, most of the remaining light incident on the light guide is totally reflected by a plane (hereinafter, referred to as a total reflection surface) formed by cutting a part of the light guide. After that, the totally reflected light goes linearly to the exit surface provided on the light guide.
  • the conventional headlight for passing is designed so that the light emitted from the light guide body reaches the exit surface of the light guide through such a path and does not illuminate a direction other than the direction to be irradiated. Has been done.
  • a part of the light emitted from the light source, incident on the light guide body, and totally reflected travels toward a surface different from the emission surface near the emission surface of the light guide body (hereinafter referred to as a non-emission surface). It ends up. A part of such light is totally reflected again on the non-emitting surface, heads toward the emitting surface, and is emitted from the light guide.
  • the light that is totally reflected on the non-emitting surface and is emitted from the light guide toward the emitting surface that is, the light that is not linearly directed from the totally reflecting surface to the emitting surface is unintended light by design.
  • the light that is not linearly directed from the totally reflecting surface to the emitting surface is unintended light by design.
  • it illuminates a direction other than the direction to be irradiated to cause uneven irradiation, or gives glare to an oncoming vehicle or a vehicle in front.
  • the passing headlight includes a light emitting mechanism that emits light, an incident portion provided with a total internal reflection surface that is a plane that totally reflects light incident from the light emitting mechanism, and a total internal reflection surface.
  • An exit surface from which the reflected light is emitted, an upper surface located above the exit surface and facing upward, and a lower surface located below the exit surface facing downward are provided, and a groove is provided on at least one of the upper surface and the lower surface.
  • a light guide body having a provided exit portion and a cover covering a grooved surface among the upper surface and the lower surface are provided.
  • FIG. 5 is a perspective view of a state in which the passing headlights according to the first embodiment are disassembled.
  • FIG. 5 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment.
  • FIG. 5 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment. It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1.
  • FIG. It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1.
  • FIG. 1 is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1.
  • FIG. 5 is a cross-sectional view showing a path of light toward a cover in the passing headlight according to the first embodiment.
  • FIG. 5 is an enlarged view of a corner portion of a groove provided in a light guide body included in the passing headlight according to the second embodiment. It is sectional drawing which shows the path of the light passing through the inside of the light guide body in the headlight for passing by which concerns on a comparative example.
  • FIG. It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 3.
  • FIG. It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 3.
  • FIG. It is a top view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1.
  • FIG. It is a top view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1.
  • FIG. It is a top view of the light guide body provided in the headlight for passing by which concerns on Embodiment 3.
  • FIG. It is a perspective view of the light guide body provided in the headlight for passing by which concerns on
  • the passing headlights which is one embodiment, will be described with reference to the attached drawings.
  • the same reference numerals are given to the same configurations in each embodiment.
  • the direction parallel to the rear and not distinguishing between the front and the rear is defined as the front-rear direction.
  • the passing headlight is attached to the vehicle, the direction from the lower part of the vehicle to the upper part of the vehicle is upward, and the direction opposite to the upward direction is downward, which is parallel to the upward and downward directions.
  • the vertical direction is a direction that does not distinguish between the upward direction and the downward direction. Further, in the directions orthogonal to the front-rear direction and the vertical direction, one side is the right direction and the other side is the left direction. In addition to this, the direction orthogonal to the front-back direction and the up-down direction and not distinguishing between the right direction and the left direction is defined as the left-right direction.
  • FIG. 1 is a perspective view of a state in which the passing headlights according to the first embodiment are disassembled.
  • FIG. 2 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment.
  • FIG. 3 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment.
  • FIG. 4 is a perspective view of a light guide body included in the passing headlight according to the first embodiment.
  • FIG. 5 is a perspective view of a light guide body included in the passing headlight according to the first embodiment.
  • the passing headlight 10 is a part of a lighting device that illuminates the front of the vehicle, and when another vehicle is in front of the own vehicle, the other vehicle in front is not dazzled. It is a headlight mainly used to illuminate the direction below the horizontal direction.
  • the passing headlight 10 includes a heat sink 20, a light emitting mechanism 30, a condenser lens 40, a light shielding member 50, a light guide body 60, and a cover 70 from the rear to the front.
  • the heat sink 20 is a member made of iron, aluminum, or the like. Further, the heat sink 20 plays a role of supporting parts such as a light emitting mechanism 30 included in the passing headlight 10 and a role of releasing heat generated from the light emitting mechanism 30 to the outside.
  • the heat sink 20 includes a main plate portion 21, a first fastening portion 22, a second fastening portion 23, an upper fastening portion 24, a lower fastening portion 25, a front fin 26, and a rear fin 27.
  • the main plate portion 21 is a rectangular plate-shaped portion.
  • the direction orthogonal to the surface of the main plate portion 21 is substantially parallel to the front-rear direction.
  • two screw holes are arranged in a direction parallel to the left-right direction in order to fasten the light emitting mechanism 30 and the condenser lens 40, which will be described later.
  • the first fastening portion 22 is an upper portion of the main plate portion 21 and forms a rectangular parallelepiped portion that protrudes forward from the central portion in the left-right direction. Further, a screw hole is provided on the surface of the first fastening portion 22 located in front of the first fastening portion 22 in order to fasten the light-shielding member 50 described later.
  • the second fastening portion 23 is a portion that protrudes forward from the lower part of the main plate portion 21. Further, the shape of the second fastening portion 23 is a rectangular parallelepiped that is longer in the left-right direction than in the up-down direction. Then, on the surface of the second fastening portion 23 located in the front direction, two screw holes are arranged in a direction parallel to the left-right direction in order to fasten the light-shielding member 50 described later.
  • the upper fastening portion 24 is an arm extending rearward from the upper portion of the main plate portion 21. Further, the rear end of the upper fastening portion 24 is bent upward. A flat surface is provided at the rear end of the upper fastening portion 24, which is bent upward and has a screw hole for attaching the heat sink 20 to the support member of the vehicle.
  • the lower fastening portion 25 is an arm extending rearward from the lower portion of the main plate portion 21. Further, the rear end of the lower fastening portion 25 is bent downward. A flat surface is provided at the rear end of the lower fastening portion 25, which is bent downward and has a screw hole for attaching the heat sink 20 to the support member of the vehicle.
  • the front fin 26 is a plate-shaped portion parallel to the front-rear direction and the up-down direction. Further, the front fin 26 has a shape close to a rectangle. Here, the long side portion located at the lower end of the rectangle formed by the front fin 26 is in contact with the upper surface of the second fastening portion 23, and the short side portion located at the rear end of the rectangle formed by the front fin 26 is the main plate portion 21. It is in contact with the front. Eight front fins 26 are arranged in the left-right direction on the heat sink 20.
  • the rear fin 27 is a plate-shaped portion parallel to the front-rear direction and the up-down direction.
  • the shape of the rear fin 27 is a rectangle that is long in the vertical direction.
  • the upper end of the rectangle formed by the rear fins 27 reaches the upper end of the main plate portion 21, and the lower end of the rectangle formed by the rear fins 27 reaches the lower end of the main plate portion 21.
  • a long side portion located at the front end of the rectangle formed by the rear fin 27 is in contact with the rear surface of the main plate portion 21.
  • Eight rear fins 27 are arranged in the left-right direction on the heat sink 20.
  • the light emitting mechanism 30 is a member that emits light, and is a member in which a plate-shaped substrate extending in the left-right direction and a light emitting diode that is a light source of the passing headlight 10 are integrated. Further, the substrate of the light emitting mechanism 30 is provided with an electric circuit for driving the light emitting diode. Further, three light emitting diodes are provided side by side in the left-right direction on the front surface of the plate-shaped portion of the light emitting mechanism 30. Further, the substrate of the light emitting mechanism 30 is provided with holes for fastening the light emitting mechanism 30 to the heat sink 20, one on each side of the three light emitting diodes.
  • the light source of the passing headlight 10 is not limited to the light emitting diode, and may be another light source such as a laser diode. Further, the number of light sources of the passing headlights 10 is not limited to three, and may be one or a plurality.
  • the condensing lens 40 is a member for condensing light from three light sources provided in the light emitting mechanism 30 and irradiating the light toward the light guide body 60 described later.
  • the shape of the condenser lens 40 is a plate shape that forms a long rectangle in the left-right direction.
  • the surface of the condensing lens 40 may be a curved surface, or the surface of the condensing lens 40 may be provided with irregularities. ..
  • the rear surface of the condenser lens 40 is provided with irregularities and curved surfaces according to the shape of the light source provided on the substrate of the light emitting mechanism 30.
  • the condenser lens 40 is fastened to the heat sink 20 by passing a bolt through the hole provided in the condenser lens 40.
  • the condenser lens 40 is fastened with the light emitting mechanism 30 sandwiched between the heat sink 20 and the heat sink 20.
  • the light emitting mechanism 30 and the condenser lens 40 are fastened to the heat sink 20 in close contact with each other.
  • the light-shielding member 50 is a member located between the condenser lens 40 and the light guide body 60.
  • the light emitting mechanism 30 is located behind the condenser lens 40, and the cover 70, which will be described later, is located in front of the light guide body 60. Therefore, the light-shielding member 50 located between the condenser lens 40 and the light guide 60 is located between the light emitting mechanism 30 and the cover 70. Further, the light-shielding member 50 is located at a position overlapping the cover 70 when viewed from a direction parallel to the direction from the light emitting mechanism 30 toward the cover 70. Further, the light-shielding member 50 has a light guide body holding portion 51, a first fastening arm 52, a second fastening arm 53, and a third fastening arm 54.
  • the light guide body holding portion 51 has a shielding portion 51S forming a hexagonal plane parallel to the vertical direction and the horizontal direction, and a portion 51E extending rearward from the outer edge of the shielding portion 51S.
  • an elongated hole 55 which is a hole forming a long rectangle in the left-right direction, is provided at the center in the up-down direction.
  • the light guide body holding portion 51 also has a portion extending rearward from the edge of the elongated hole 55. Further, the incident portion 61 of the light guide body 60, which will be described later, is accommodated in the elongated hole 55.
  • Three screw holes are provided on the front surface of the light guide body holding portion 51.
  • One screw hole is located above the elongated hole 55 provided in the center of the light guide body holding portion 51, and the remaining two screw holes are located below the elongated hole 55.
  • Bolts for fastening the light guide body 60 which will be described later, are inserted into these three screw holes provided on the front surface of the light guide body holding portion 51.
  • the first fastening arm 52 in the light-shielding member 50 is a plate-shaped portion extending upward from the upper part of the light guide body holding portion 51. Further, a hole for fastening the first fastening arm 52 to the first fastening portion 22 of the heat sink 20 is provided in the center of the first fastening arm 52 when viewed from the front-rear direction.
  • the second fastening arm 53 is a plate-shaped portion extending downward from the right side of the lower portion of the light guide body holding portion 51. Further, a hole for fastening the second fastening arm 53 to the second fastening portion 23 of the heat sink 20 is also provided in the center of the second fastening arm 53 when viewed from the front-rear direction.
  • the third fastening arm 54 is a plate-shaped portion extending downward from the left side of the lower portion of the light guide body holding portion 51. Further, a hole for fastening the third fastening arm 54 to the second fastening portion 23 of the heat sink 20 is also provided in the center of the third fastening arm 54 when viewed from the front-rear direction. Then, the first fastening arm 52 is bolted to the first fastening portion 22 of the heat sink 20, the second fastening arm 53 is bolted to the second fastening portion 23 of the heat sink 20, and the third fastening arm 54 is further fastened. The light-shielding member 50 is fixed to the heat sink 20 by being fastened to the second fastening portion 23 of the heat sink 20 with bolts.
  • the light guide body 60 is located in front of the condensing lens 40 with the light-shielding member 50 interposed therebetween, and forwards the light emitted from the light source of the light emitting mechanism 30 and incident through the condensing lens 40. It is a member that irradiates toward. Then, as shown in FIG. 2, the light guide body 60 has an incident portion 61, an exit portion 63, and an attachment portion 66.
  • the incident portion 61 is a portion where the light emitted from the light emitting mechanism 30 and passing through the condenser lens 40 is incident on the light guide body 60. Therefore, the incident portion 61 faces the condensing lens 40 integrated with the light emitting mechanism 30. Further, the incident portion 61 has a shape close to that of a rectangular parallelepiped. However, as shown in FIG. 3, the lower part of the incident portion 61 is partially cut. This is a total reflection surface 61R which is a flat surface formed by cutting a part of the incident portion 61, and totally reflects the light incident on the light guide body 60 from the light emitting mechanism 30 and is in front of the light guide body 60.
  • the incident portion 61 projects rearward from the elongated hole 55 of the light-shielding member 50, the light from the light emitting mechanism 30 reaches the incident portion 61 without being disturbed by the light-shielding member 50.
  • the exiting portion 63 is a portion that emits the light totally reflected by the totally reflecting surface 61R of the incident portion 61 toward the front, and is in contact with the incident portion 61 in the front-rear direction. Specifically, the light totally reflected by the total reflection surface 61R of the incident portion 61 is emitted from the emission surface 631 of the emission portion 63 located in front of the light guide body 60. Further, as shown in FIG. 2, the shape of the exit portion 63 is such that the cylinder is cut in half in the direction parallel to the central axis thereof. Then, in the solid formed by the exit portion 63, the curved surface located in front is the exit surface 631.
  • the lower surface 632 is provided with a groove 632G parallel to the left-right direction.
  • a groove 633G parallel to the left-right direction is also provided on the upper surface 633.
  • the direction in which the groove 632G extends that is, the shape of the cross section orthogonal to the left-right direction forms a triangle in which the width narrows from the opening to the bottom.
  • the shape of the cross section orthogonal to the extending direction of the groove 633G that is, the left-right direction forms a triangle whose width narrows from the opening to the bottom.
  • the mounting portion 66 is a plate-shaped portion extending in the vertical direction and the horizontal direction from the rear end portion of the emitting portion 63.
  • a through hole 661 that penetrates the mounting portion 66 in the front-rear direction is provided at the center in the left-right direction of the portion that extends upward with respect to the emitting portion 63.
  • a through hole 662 that penetrates the mounting portion 66 in the front-rear direction is also provided at the lower end of the portion that extends to the right with respect to the emitting portion 63.
  • a through hole 663 that penetrates the mounting portion 66 in the front-rear direction is also provided at the lower end of the portion that extends to the left with respect to the emitting portion 63. Then, the bolt is passed through the through hole 661, the through hole 662, and the through hole 663, so that the light guide body 60 is fastened to the light guide body holding portion 51 of the light shielding member 50.
  • the cover 70 is a resin cover that covers the front surface of the light guide body 60. Further, the cover 70 covers the lower surface 632 of the light guide body 60 and the upper surface 633 of the light guide body 60, and also covers the front surface of the mounting portion 66 of the light guide body 60. That is, the cover 70 covers the surface of the lower surface 632 of the light guide body 60 and the upper surface 633 of the light guide body 60 where the groove is provided, and also covers the front surface of the mounting portion 66 of the light guide body 60.
  • the exit surface 631 of the light guide body 60 is covered with the cover 70 when viewed from the front side. No.
  • FIG. 6 is a cross-sectional view showing a path of light passing through the inside of the light guide body in the passing headlight according to the first embodiment.
  • FIG. 7 is an enlarged cross-sectional view of a path and a groove of light passing through the inside of the light guide body in the passing headlight according to the first embodiment.
  • the alternate long and short dash line in FIG. 7 represents the normal line of the plane formed by the transmission portions 632S and 633S, which will be described later.
  • three light emitting diodes which are light sources of the light emitting mechanism 30 emit light.
  • the light emitted from the three light emitting diodes is condensed by the condenser lens 40 and directed toward the light guide body 60.
  • the light directed to the light guide body 60 is incident on the inside of the light guide body 60 from the surface behind the incident portion 61 of the light guide body 60.
  • most of the light incident on the inside of the light guide body 60 is totally reflected by the total reflection surface 61R of the incident portion 61, emitted from the exit surface 631 of the light guide body 60, and passes each other.
  • a part of the light incident on the light guide 60 heads toward the lower surface 632 without being totally reflected by the total reflection surface 61R, or after being totally reflected by the total reflection surface 61R. , Not toward the exit surface 631 but toward the upper surface 633.
  • the lower surface 632 is provided with a groove 632G.
  • a transmission portion 632S forming a surface parallel to or nearly parallel to the front-rear direction and the vertical direction is formed on the lower surface 632.
  • most of the light that has reached the lower surface 632 is incident on the transmission portion 632S formed by the groove 632G.
  • the angle formed by the normal line of the plane formed by the transmitting portion 632S and the traveling direction of the light incident on the transmitting portion 632S, that is, the incident angle ⁇ 1 is smaller than the critical angle.
  • the light that has reached the lower surface 632 is not totally reflected by the lower surface 632, but is transmitted through the transmitting portion 632S of the lower surface 632, exits from the lower surface 632 to the outside of the light guide body 60, and then heads downward. .. Then, the light directed downward from the lower surface 632 is blocked by the cover 70 as shown in FIG.
  • a groove 633G is also provided on the upper surface 633.
  • a transmission portion 633S forming a surface parallel to or close to parallel in the front-rear direction and the vertical direction is formed on the upper surface 633.
  • most of the light that has reached the upper surface 633 is incident on the transmission portion 633S formed by the groove 633G.
  • the angle formed by the normal line of the plane formed by the transmitting portion 633S and the traveling direction of the light incident on the transmitting portion 633S, that is, the incident angle ⁇ 2 is smaller than the critical angle.
  • the light that has reached the upper surface 633 is not totally reflected by the upper surface 633, but is transmitted through the transmitting portion 633S of the upper surface 633, exits from the upper surface 633 to the outside of the light guide body 60, and then heads upward. .. Then, the light directed upward from the upper surface 633 is blocked by the cover 70 as shown in FIG.
  • FIG. 8 is a cross-sectional view showing a path of light passing through the inside of the light guide body in the passing headlight according to the comparative example.
  • FIG. 9 is a cross-sectional view showing a path of light toward the cover in the passing headlight according to the comparative example.
  • FIG. 10 is a cross-sectional view showing a path of light toward the cover in the passing headlight according to the first embodiment.
  • the passing headlight 10 can suppress illumination in a direction other than the direction to be irradiated. Specifically, as described above, a part of the light incident on the light guide 60 is directed to the lower surface 632 without being totally reflected by the total reflection surface 61R.
  • the lower surface 632 of the light guide body 60 is flat, the light incident on the light guide body 60 and reaching the lower surface 632 is totally reflected by the lower surface 632 and is reflected on the exit surface 631. It faces and is emitted from the light guide body 60.
  • the light emitted from the light guide body 60 irradiates the light in the direction higher than the direction in which the passing headlights should irradiate, and gives glare to the oncoming vehicle and the vehicle in front.
  • a groove 632G is provided on the lower surface 632 of the light guide body 60.
  • the lower surface 632 is formed with a transmission portion 632S forming a surface parallel to or nearly parallel to the front-rear direction and the vertical direction. Then, most of the light that has reached the lower surface 632 is incident on the transmission portion 632S formed by the groove 632G.
  • the angle formed by the normal line of the plane formed by the transmitting portion 632S and the traveling direction of the light incident on the transmitting portion 632S is smaller than the critical angle.
  • the light that has reached the lower surface 632 is not totally reflected by the lower surface 632, but is transmitted through the transmitting portion 632S of the lower surface 632, exits from the lower surface 632 to the outside of the light guide body 60, and then heads downward. .. Then, the light directed downward from the lower surface 632 is blocked by the cover 70.
  • the passing headlight 10 can suppress the illumination in a direction other than the direction to be irradiated.
  • a part of the light incident on the light guide body 60 is totally reflected by the total reflection surface 61R, and then goes to the upper surface 633 instead of the exit surface 631.
  • the upper surface 633 of the light guide body 60 when the upper surface 633 of the light guide body 60 is flat, the light incident on the light guide body 60 and reaching the upper surface 633 is totally reflected by the upper surface 633 and is reflected on the exit surface 631. It faces and is emitted from the light guide body 60. In this way, the light emitted from the light guide body 60 irradiates in a direction lower than the direction to be irradiated by the passing headlights, and causes irradiation unevenness.
  • the groove 633G is also provided on the upper surface 633.
  • a transmission portion 633S forming a surface parallel to or nearly parallel to the front-rear direction and the vertical direction is formed on the upper surface 633.
  • most of the light that has reached the upper surface 633 is incident on the transmission portion 633S formed by the groove 633G.
  • the angle formed by the normal line of the plane formed by the transmitting portion 633S and the traveling direction of the light incident on the transmitting portion 633S, that is, the incident angle ⁇ 2 is smaller than the critical angle.
  • the light that has reached the upper surface 633 is not totally reflected by the upper surface 633, but is transmitted through the transmitting portion 633S of the upper surface 633, exits from the upper surface 633 to the outside of the light guide body 60, and then heads upward. .. Then, the light directed upward is blocked by the cover 70.
  • the passing headlight 10 can suppress the illumination in a direction other than the direction to be irradiated.
  • the passing headlight 10 can be further suppressed from illuminating in a direction other than the direction to be irradiated by the light-shielding member 50. Specifically, as shown in FIG. 9, if the light-shielding member 50 is not present, a part of the light emitted from the light emitting mechanism 30 linearly heads toward the cover 70, and the light guide body in the cover 70. Reflects on the surface covering the lower surface 632 of 60.
  • the passing headlight 10 is provided with a light-shielding member 50.
  • the light-shielding member 50 is located between the light emitting mechanism 30 and the cover 70, and is located at a position overlapping the cover 70 when viewed from a direction parallel to the direction from the light emitting mechanism 30 toward the cover 70. As a result, the light emitted from the light emitting mechanism 30 and going straight toward the cover 70 is blocked.
  • the light emitted from the light emitting mechanism 30 and going linearly toward the cover 70 is suppressed from being reflected by the surface of the cover 70 that covers the lower surface 632 of the light guide body 60.
  • the passing headlight 10 can suppress the illumination in a direction other than the direction to be irradiated.
  • the light reflected by the surface of the cover 70 that covers the lower surface 632 of the light guide 60 is illustrated, but the light is emitted from the light emitting mechanism 30 and is linear to the surface of the cover 70 that covers the upper surface 633 of the light guide 60.
  • the light-shielding member 50 has the same effect on the light that tends toward the light. When the light-shielding member 50 is not present, the light guide body 60 is fixed by, for example, being directly fastened to the heat sink 20.
  • FIG. 11 is an enlarged view of a corner portion of a groove provided in a light guide body included in the passing headlight according to the second embodiment.
  • FIG. 12 is a cross-sectional view showing a path of light passing through the inside of the light guide body in the passing headlight according to the comparative example.
  • the difference between the passing headlights according to the second embodiment and the passing headlights according to the first embodiment is that the passing headlights according to the second embodiment are provided on the light guide body 60.
  • the bottom surface of the groove 632G and the groove 633G is provided with irregularities.
  • the passing headlight according to the second embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment.
  • the corner portions of the bottom of the groove 632G and the groove 633G provided in the light guide body 60 are practically difficult to have a completely sharp shape and are rounded. Become a shape.
  • most of the light directed toward the lower surface 632 and the upper surface 633 of the light guide 60 passes through the transmission portion 632S formed by the groove 632G or the transmission portion 633S formed by the groove 633G. It is shielded from light by the cover 70.
  • the light directed to the lower surface 632 and the upper surface 633 of the light guide 60 is directed to the corners of the groove 632G and the groove 633G.
  • the incident angle of the light directed toward the corner portions of the groove 632G and the groove 633G becomes large because the corner portions of the groove 632G and the groove 633G are rounded.
  • the light directed to the corners of the groove 632G and the groove 633G is totally reflected at the corners of the groove 632G and the groove 633G, and the light is totally reflected at the corners of the groove 632G and the groove 633G. I will go to.
  • the headlight 10 illuminates a direction other than the direction to be irradiated.
  • the passing headlight according to the second embodiment as shown in FIG. 11, on the surface of the bottom corner portion of the groove 632G and the groove 633G provided in the light guide body 60, as shown in FIG. , Unevenness is provided.
  • the passing headlight according to the second embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment.
  • FIG. 13 is a perspective view of a light guide body included in the passing headlight according to the third embodiment.
  • FIG. 14 is a perspective view of a light guide body included in the passing headlight according to the third embodiment.
  • FIG. 15 is a plan view of a light guide body included in the passing headlight according to the first embodiment.
  • FIG. 16 is a plan view of a light guide body included in the passing headlight according to the first embodiment.
  • FIG. 17 is a plan view of a light guide body included in the passing headlight according to the third embodiment.
  • the differences between the passing headlights according to the third embodiment and the passing headlights according to the first embodiment are shown in FIGS. 13 and 14 in the passing headlights according to the third embodiment.
  • the groove 632G and the groove 633G provided on the lower surface 632 and the upper surface 633 of the light guide body 60 extend in parallel with the exit surface 631 of the light guide body 60.
  • the passing headlight according to the third embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment.
  • the path of light that passes through the inside of the light guide body 60 and is emitted from the light emission surface 631 of the light guide body 60 is designed to be incident on the light emission surface 631 from a direction perpendicular to or close to vertical. Has been done.
  • the exit surface 631 draws a semicircle when viewed from the vertical direction. Therefore, the light emitted from the vicinity of both ends in the left-right direction of the exit surface 631 is incident on the exit surface 631 from a direction parallel to or close to the left-right direction.
  • the traveling direction of the light toward both ends in the left-right direction on the lower surface 632 and the upper surface 633 is also parallel to or close to the left-right direction.
  • the groove 632G and the groove 633G are parallel to the left-right direction as in the groove 632G and the groove 633G according to the first embodiment shown in FIG. 15
  • the traveling direction and the direction in which the groove 632G and the groove 633G extend are parallel or nearly parallel.
  • angles of incidence ⁇ 3 and ⁇ 4 on the transmitting portion 632S and the transmitting portion 633S formed by the grooves 632G and the groove 633G in the light directed toward both ends in the left-right direction on the lower surface 632 and the upper surface 633 are shown in FIG.
  • the angles of incidence on the transmission portions 632S and the transmission portion 633S formed by the grooves 632G and the grooves 633G in the light directed toward the center in the left-right direction on the lower surface 632 and the upper surface 633 are larger than the incident angles ⁇ 5 and ⁇ 6.
  • the grooves 632G and the grooves 633G provided on the lower surface 632 and the upper surface 633 of the light guide body 60 extend in parallel with the exit surface 631 of the light guide body 60. .. As a result, as shown in FIG.
  • the incident angle ⁇ 7 to the transmission portion 632S and the transmission portion 633S formed by the groove 632G and the groove 633G in the light directed toward both ends in the left-right direction on the lower surface 632 and the upper surface 633 is the groove. It is smaller than the case where the 632G and the groove 633G are parallel to the left-right direction. As a result, the light directed to the vicinity of both ends in the left-right direction on the lower surface 632 and the upper surface 633 is not totally reflected by the lower surface 632 and the upper surface 633, but exits from the lower surface 632 and the upper surface 633 to the outside of the light guide body 60. It is shielded from light by the cover 70.
  • the passing headlight according to the third embodiment the light directed to the vicinity of both ends in the left-right direction on the lower surface 632 and the upper surface 633 is totally reflected by the lower surface 632 and the upper surface 633 and emitted from the emission surface 631, resulting in uneven irradiation. It is possible to suppress the situation that causes glare. That is, the passing headlight according to the third embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment.
  • the passing headlights according to the present disclosure are not limited to the above-described embodiments and can be changed within the scope of the gist thereof.
  • a groove may be provided on at least one of the lower surface 632 and the upper surface 633.
  • the cover 70 may cover the grooved surface of the lower surface 632 and the upper surface 633, and does not need to cover both the lower surface 632 and the upper surface 633.
  • the unevenness provided on the surface of the bottom of the groove 632G and the groove 633G may be provided not only on the bottom but also on the entire surface of the groove, or may be provided only on the surface of the bottom of either one of the grooves. good.
  • the shape of the light guide body 60 is not limited to the shape according to the above-described embodiment, and for example, as shown in FIG. 18, the normal line of the exit surface 631 is in a direction parallel to the front-rear direction. There may be. At this time, the groove of the light guide body 60 is parallel to the left-right direction. Moreover, you may combine each embodiment.

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Abstract

Provided is a passing-beam headlight capable of restraining light from being emitted in directions other than an intended illuminating direction.　A passing-beam headlight (10) is provided with: a light-emitting mechanism (30) for emitting light; a light guide body (60) comprising an incidence part (61) which is provided with a total-reflection surface (61R), that is, a surface for total reflection of the light incident from the light-emitting mechanism (30), and an emission part (63) which is provided with an emission surface (631) through which the light reflected by the total-reflection surface (61R) is emitted, a lower surface (632) positioned in a lower part of the emission surface (631) and facing downward, an upper surface (633) positioned in an upper part of the emission surface (631) and facing upward, and a groove (632G, 633G) formed on the lower surface (632) and/or the upper surface (633); and a cover (70) for covering the lower surface (632) and/or the upper surface (633) on which the groove is formed.

Description

すれ違い用前照灯Headlights for passing
　本開示は、車両に搭載されるすれ違い用前照灯に関する。 This disclosure relates to the passing headlights mounted on the vehicle.
　車両に搭載されるすれ違い用前照灯は、単に車両前方を照らすわけではなく、照射すべき方向以外の方向を照らさないように設計されている。このようなすれ違い用前照灯として、特許文献１に記載のような前照灯モジュール（以下、従来のすれ違い用前照灯と称す）がある。 The passing headlights mounted on the vehicle are designed not to illuminate the front of the vehicle, but to illuminate any direction other than the direction in which it should be irradiated. As such a headlight for passing, there is a headlight module (hereinafter, referred to as a conventional headlight for passing) as described in Patent Document 1.
　従来のすれ違い用前照灯は、光源及び光源からの光を車両前方へ照射する導光体を備えている。そして、従来のすれ違い用前照灯は、光源から発せられ導光体に入射した光を導光体に設けられた出射面から出射する。このとき、導光体に入射した光の一部は、導光体に入射した後に直線的に出射面に向かう。また、導光体に入射した残りの光の大部分は、導光体の一部をカットすることで形成された平面（以下で、全反射面と称す）で全反射される。その後、全反射した光は、導光体に設けられた出射面に直線的に向かう。このような経路を通過して導光体の出射面に到達し、導光体から出射された光が、照射すべき方向以外の方向を照らさないように、従来のすれ違い用前照灯は設計されている。 The conventional passing headlight is equipped with a light source and a light guide body that irradiates the light from the light source to the front of the vehicle. Then, in the conventional headlight for passing each other, the light emitted from the light source and incident on the light guide body is emitted from the exit surface provided on the light guide body. At this time, a part of the light incident on the light guide body linearly heads toward the exit surface after being incident on the light guide body. In addition, most of the remaining light incident on the light guide is totally reflected by a plane (hereinafter, referred to as a total reflection surface) formed by cutting a part of the light guide. After that, the totally reflected light goes linearly to the exit surface provided on the light guide. The conventional headlight for passing is designed so that the light emitted from the light guide body reaches the exit surface of the light guide through such a path and does not illuminate a direction other than the direction to be irradiated. Has been done.
特開２０１８－１７４１５９号公報JP-A-2018-174159
　ところで、導光体に入射した全ての光を、設計の意図通りに出射面に直線的に向かわせる、または、全反射させて出射面に直線的に向かわせることは困難である。例えば、光源から発せられ導光体に入射して全反射した光の一部は、導光体の出射面近傍の出射面とは異なる面（以下、非出射面と称す）に向かって進んでしまう。このような光の一部は、非出射面で再び全反射して出射面に向かい、導光体から出射される。ここで、非出射面で再び全反射して出射面に向かい導光体から出射される光、つまり、全反射面から出射面に直線的に向かわない光は、設計上意図しない光であるため、照射すべき方向以外の方向を照らし、照射ムラを発生させる、又は、対向車や前走車にグレアを与えてしまうという課題があった。 By the way, it is difficult to direct all the light incident on the light guide linearly to the exit surface as intended by the design, or to totally reflect the light and direct it linearly to the exit surface. For example, a part of the light emitted from the light source, incident on the light guide body, and totally reflected travels toward a surface different from the emission surface near the emission surface of the light guide body (hereinafter referred to as a non-emission surface). It ends up. A part of such light is totally reflected again on the non-emitting surface, heads toward the emitting surface, and is emitted from the light guide. Here, the light that is totally reflected on the non-emitting surface and is emitted from the light guide toward the emitting surface, that is, the light that is not linearly directed from the totally reflecting surface to the emitting surface is unintended light by design. There is a problem that it illuminates a direction other than the direction to be irradiated to cause uneven irradiation, or gives glare to an oncoming vehicle or a vehicle in front.
　本開示は、照射すべき方向以外の方向を照らすことを抑制することができるすれ違い用前照灯を提供することを目的とする。 It is an object of the present disclosure to provide a passing headlight capable of suppressing illumination in a direction other than the direction to be irradiated.
　本開示の一形態に係るすれ違い用前照灯は、光を発する発光機構と、発光機構から入射した光を全反射させる平面である全反射面が設けられた入射部、並びに全反射面で全反射した光が出射される出射面、出射面の上部に位置して上側を向く上面及び出射面の下部に位置して下側を向く下面が設けられるとともに、上面又は下面の少なくとも一方に溝が設けられた出射部を有する導光体と、上面及び下面のうち溝が設けられた面を覆うカバーと、を備える。 The passing headlight according to one embodiment of the present disclosure includes a light emitting mechanism that emits light, an incident portion provided with a total internal reflection surface that is a plane that totally reflects light incident from the light emitting mechanism, and a total internal reflection surface. An exit surface from which the reflected light is emitted, an upper surface located above the exit surface and facing upward, and a lower surface located below the exit surface facing downward are provided, and a groove is provided on at least one of the upper surface and the lower surface. A light guide body having a provided exit portion and a cover covering a grooved surface among the upper surface and the lower surface are provided.
　上記のように構成されたすれ違い用前照灯では、照射すべき方向以外の方向を照らすことを抑制することができる。 With the passing headlights configured as described above, it is possible to suppress illuminating in a direction other than the direction to be irradiated.
実施の形態１に係るすれ違い用前照灯が分解された状態の斜視図である。FIG. 5 is a perspective view of a state in which the passing headlights according to the first embodiment are disassembled. 実施の形態１に係るすれ違い用前照灯が備える発光機構、集光レンズ及び導光体の斜視図である。FIG. 5 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment. 実施の形態１に係るすれ違い用前照灯が備える発光機構、集光レンズ及び導光体の斜視図である。FIG. 5 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment. 実施の形態１に係るすれ違い用前照灯が備える導光体の斜視図である。It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1. FIG. 実施の形態１に係るすれ違い用前照灯が備える導光体の斜視図である。It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1. FIG. 実施の形態１に係るすれ違い用前照灯における導光体内部を通過する光の経路を示す断面図である。It is sectional drawing which shows the path of the light passing through the inside of the light guide body in the headlight for passing by which concerns on Embodiment 1. FIG. 実施の形態１に係るすれ違い用前照灯における導光体内部を通過する光の経路を示す断面図である。It is sectional drawing which shows the path of the light passing through the inside of the light guide body in the headlight for passing by which concerns on Embodiment 1. FIG. 比較例に係るすれ違い用前照灯における導光体内部を通過する光の経路を示す断面図である。It is sectional drawing which shows the path of the light passing through the inside of the light guide body in the headlight for passing by which concerns on a comparative example. 比較例に係るすれ違い用前照灯におけるカバーに向かう光の経路を示す断面図である。It is sectional drawing which shows the path of the light toward the cover in the headlight for passing by which concerns on a comparative example. 実施の形態１に係るすれ違い用前照灯におけるカバーに向かおうとする光の経路を示す断面図である。FIG. 5 is a cross-sectional view showing a path of light toward a cover in the passing headlight according to the first embodiment. 実施の形態２に係るすれ違い用前照灯が備える導光体に設けられた溝の角部分の拡大図である。FIG. 5 is an enlarged view of a corner portion of a groove provided in a light guide body included in the passing headlight according to the second embodiment. 比較例に係るすれ違い用前照灯における導光体内部を通過する光の経路を示す断面図である。It is sectional drawing which shows the path of the light passing through the inside of the light guide body in the headlight for passing by which concerns on a comparative example. 実施の形態３に係るすれ違い用前照灯が備える導光体の斜視図である。It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 3. FIG. 実施の形態３に係るすれ違い用前照灯が備える導光体の斜視図である。It is a perspective view of the light guide body provided in the headlight for passing by which concerns on Embodiment 3. FIG. 実施の形態１に係るすれ違い用前照灯が備える導光体の平面図である。It is a top view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1. FIG. 実施の形態１に係るすれ違い用前照灯が備える導光体の平面図である。It is a top view of the light guide body provided in the headlight for passing by which concerns on Embodiment 1. FIG. 実施の形態３に係るすれ違い用前照灯が備える導光体の平面図である。It is a top view of the light guide body provided in the headlight for passing by which concerns on Embodiment 3. FIG. 他の実施の形態に係るすれ違い用前照灯が備える導光体の斜視図である。It is a perspective view of the light guide body provided in the headlight for passing by which concerns on other embodiment.
　以下で、一実施形態であるすれ違い用前照灯について、添付した図面を参照しながら説明する。各実施の形態において同一の構成については、同一の符号を付す。また、以下の説明の際、すれ違い用前照灯が車両に取り付けられた状態に基づいて、車両後部から車両前部に向かう方向を前方とし、前方に対して反対の方向を後方とし、前方及び後方と平行な方向であって、前方及び後方を区別しない方向を前後方向とする。また、すれ違い用前照灯が車両に取り付けられた際に、車両の下部から車両の上部に向かう方向を上方向、上方向に対して反対の方向を下方向とし、上方向及び下方向と平行な方向であって上方向及び下方向を区別しない方向を上下方向とする。さらに、前後方向及び上下方向と直交する方向において、一方側を右方向とし、他方側を左方向とする。これに加え、前後方向及び上下方向と直交する方向であって、右方向及び左方向を区別しない方向を左右方向とする。 Below, the passing headlights, which is one embodiment, will be described with reference to the attached drawings. The same reference numerals are given to the same configurations in each embodiment. Further, in the following explanation, based on the state in which the passing headlights are attached to the vehicle, the direction from the rear of the vehicle to the front of the vehicle is defined as the front, and the direction opposite to the front is defined as the rear. The direction parallel to the rear and not distinguishing between the front and the rear is defined as the front-rear direction. In addition, when the passing headlight is attached to the vehicle, the direction from the lower part of the vehicle to the upper part of the vehicle is upward, and the direction opposite to the upward direction is downward, which is parallel to the upward and downward directions. The vertical direction is a direction that does not distinguish between the upward direction and the downward direction. Further, in the directions orthogonal to the front-rear direction and the vertical direction, one side is the right direction and the other side is the left direction. In addition to this, the direction orthogonal to the front-back direction and the up-down direction and not distinguishing between the right direction and the left direction is defined as the left-right direction.
　実施の形態１．
　図１は、実施の形態１に係るすれ違い用前照灯が分解された状態の斜視図である。図２は、実施の形態１に係るすれ違い用前照灯が備える発光機構、集光レンズ及び導光体の斜視図である。図３は、実施の形態１に係るすれ違い用前照灯が備える発光機構、集光レンズ及び導光体の斜視図である。図４は、実施の形態１に係るすれ違い用前照灯が備える導光体の斜視図である。図５は、実施の形態１に係るすれ違い用前照灯が備える導光体の斜視図である。 Embodiment 1.
FIG. 1 is a perspective view of a state in which the passing headlights according to the first embodiment are disassembled. FIG. 2 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment. FIG. 3 is a perspective view of a light emitting mechanism, a condenser lens, and a light guide body included in the passing headlight according to the first embodiment. FIG. 4 is a perspective view of a light guide body included in the passing headlight according to the first embodiment. FIG. 5 is a perspective view of a light guide body included in the passing headlight according to the first embodiment.
　実施の形態１に係るすれ違い用前照灯１０は、車両の前方を照射する照明装置の一部であり、自車両の前方に他車両が存在する場合に、前方の他車両を眩惑しないよう、主に水平方向よりも下方向を照らす際に用いられる前照灯である。 The passing headlight 10 according to the first embodiment is a part of a lighting device that illuminates the front of the vehicle, and when another vehicle is in front of the own vehicle, the other vehicle in front is not dazzled. It is a headlight mainly used to illuminate the direction below the horizontal direction.
　図１に示すように、すれ違い用前照灯１０は、後方から前方に向かって、ヒートシンク２０、発光機構３０、集光レンズ４０、遮光部材５０、導光体６０及びカバー７０を備えている。 As shown in FIG. 1, the passing headlight 10 includes a heat sink 20, a light emitting mechanism 30, a condenser lens 40, a light shielding member 50, a light guide body 60, and a cover 70 from the rear to the front.
　ヒートシンク２０は、鉄やアルミなどを材料とする部材である。また、ヒートシンク２０は、すれ違い用前照灯１０に含まれる発光機構３０などの部品を支持する役割と、発光機構３０から発生する熱を外部に逃がす役割とを担っている。そして、ヒートシンク２０は、主板部２１、第１締結部２２、第２締結部２３、上部締結部２４、下部締結部２５、前方フィン２６、及び後方フィン２７を備えている。 The heat sink 20 is a member made of iron, aluminum, or the like. Further, the heat sink 20 plays a role of supporting parts such as a light emitting mechanism 30 included in the passing headlight 10 and a role of releasing heat generated from the light emitting mechanism 30 to the outside. The heat sink 20 includes a main plate portion 21, a first fastening portion 22, a second fastening portion 23, an upper fastening portion 24, a lower fastening portion 25, a front fin 26, and a rear fin 27.
　主板部２１は、長方形を成す板状の部分である。ここで、主板部２１の面と直交する方向は、前後方向とほぼ平行である。また、主板部２１の上下方向における中央付近には、後述する発光機構３０及び集光レンズ４０を締結するため、２つのねじ穴が左右方向と平行な方向に並んでいる。 The main plate portion 21 is a rectangular plate-shaped portion. Here, the direction orthogonal to the surface of the main plate portion 21 is substantially parallel to the front-rear direction. Further, in the vicinity of the center of the main plate portion 21 in the vertical direction, two screw holes are arranged in a direction parallel to the left-right direction in order to fasten the light emitting mechanism 30 and the condenser lens 40, which will be described later.
　第１締結部２２は、主板部２１の上部であって、左右方向の中央部分から前方に向かって突出している直方体を成す部分である。また、第１締結部２２の前方に位置する面には、後述する遮光部材５０を締結するため、ねじ穴が設けられている。 The first fastening portion 22 is an upper portion of the main plate portion 21 and forms a rectangular parallelepiped portion that protrudes forward from the central portion in the left-right direction. Further, a screw hole is provided on the surface of the first fastening portion 22 located in front of the first fastening portion 22 in order to fasten the light-shielding member 50 described later.
　第２締結部２３は、主板部２１の下部から前方に向かって突出している部分である。また、第２締結部２３の形状は、上下方向よりも左右方向に長い直方体を成している。そして、第２締結部２３の前方向に位置する面には、後述する遮光部材５０を締結するため、２つのねじ穴が左右方向と平行な方向に並んでいる。 The second fastening portion 23 is a portion that protrudes forward from the lower part of the main plate portion 21. Further, the shape of the second fastening portion 23 is a rectangular parallelepiped that is longer in the left-right direction than in the up-down direction. Then, on the surface of the second fastening portion 23 located in the front direction, two screw holes are arranged in a direction parallel to the left-right direction in order to fasten the light-shielding member 50 described later.
　上部締結部２４は、主板部２１の上部から後方に向かって伸びる腕である。また、上部締結部２４の後端は、上方向に向かって折れ曲がっている。そして、上部締結部２４の後端における上方向に折れ曲がった先に、ヒートシンク２０を車両の支持部材に取り付けるためのねじ孔が開けられた平面が設けられている。 The upper fastening portion 24 is an arm extending rearward from the upper portion of the main plate portion 21. Further, the rear end of the upper fastening portion 24 is bent upward. A flat surface is provided at the rear end of the upper fastening portion 24, which is bent upward and has a screw hole for attaching the heat sink 20 to the support member of the vehicle.
　下部締結部２５は、主板部２１の下部から後方に向かって伸びる腕である。また、下部締結部２５の後端は、下方向に向かって折れ曲がっている。そして、下部締結部２５の後端における下方向に折れ曲がった先に、ヒートシンク２０を車両の支持部材に取り付けるためのねじ孔が開けられた平面が設けられている。 The lower fastening portion 25 is an arm extending rearward from the lower portion of the main plate portion 21. Further, the rear end of the lower fastening portion 25 is bent downward. A flat surface is provided at the rear end of the lower fastening portion 25, which is bent downward and has a screw hole for attaching the heat sink 20 to the support member of the vehicle.
　前方フィン２６は、前後方向及び上下方向と平行な板状の部分である。また、前方フィン２６は、長方形に近い形状を成している。ここで、前方フィン２６が成す長方形の下端に位置する長辺部分が、第２締結部２３の上面と接し、前方フィン２６が成す長方形の後端に位置する短辺部分が、主板部２１の前面と接している。そして、ヒートシンク２０には、前方フィン２６が、左右方向に８つ並んでいる。 The front fin 26 is a plate-shaped portion parallel to the front-rear direction and the up-down direction. Further, the front fin 26 has a shape close to a rectangle. Here, the long side portion located at the lower end of the rectangle formed by the front fin 26 is in contact with the upper surface of the second fastening portion 23, and the short side portion located at the rear end of the rectangle formed by the front fin 26 is the main plate portion 21. It is in contact with the front. Eight front fins 26 are arranged in the left-right direction on the heat sink 20.
　後方フィン２７は、前後方向及び上下方向と平行な板状の部分である。また、後方フィン２７の形状は、上下方向に長い長方形である。ここで、後方フィン２７が成す長方形の上端は、主板部２１の上端まで達し、後方フィン２７が成す長方形の下端は、主板部２１の下端まで達している。また、後方フィン２７が成す長方形の前端に位置する長辺部分が、主板部２１の後面と接している。そして、ヒートシンク２０には、後方フィン２７が、左右方向に８つ並んでいる。 The rear fin 27 is a plate-shaped portion parallel to the front-rear direction and the up-down direction. The shape of the rear fin 27 is a rectangle that is long in the vertical direction. Here, the upper end of the rectangle formed by the rear fins 27 reaches the upper end of the main plate portion 21, and the lower end of the rectangle formed by the rear fins 27 reaches the lower end of the main plate portion 21. Further, a long side portion located at the front end of the rectangle formed by the rear fin 27 is in contact with the rear surface of the main plate portion 21. Eight rear fins 27 are arranged in the left-right direction on the heat sink 20.
　発光機構３０は、光を発する部材であり、左右方向に伸びる板状の基板と、すれ違い用前照灯１０の光源である発光ダイオードとが一体になった部材である。また、発光機構３０における基板には、発光ダイオードを駆動するための電気回路が設けられている。また、発光機構３０における板状の部分の前面には、発光ダイオードが、左右方向に３つ並んで設けられている。さらに、発光機構３０が有する基板には、発光機構３０をヒートシンク２０に締結するための孔が、３つの発光ダイオードを挟んで、左右一つずつ設けられている。なお、すれ違い用前照灯１０の光源は、発光ダイオードに限られず、例えば、レーザダイオードなど他の光源でもよい。さらに、すれ違い用前照灯１０の光源の個数は、３つに限られず1つでもよいし、複数であってもよい。 The light emitting mechanism 30 is a member that emits light, and is a member in which a plate-shaped substrate extending in the left-right direction and a light emitting diode that is a light source of the passing headlight 10 are integrated. Further, the substrate of the light emitting mechanism 30 is provided with an electric circuit for driving the light emitting diode. Further, three light emitting diodes are provided side by side in the left-right direction on the front surface of the plate-shaped portion of the light emitting mechanism 30. Further, the substrate of the light emitting mechanism 30 is provided with holes for fastening the light emitting mechanism 30 to the heat sink 20, one on each side of the three light emitting diodes. The light source of the passing headlight 10 is not limited to the light emitting diode, and may be another light source such as a laser diode. Further, the number of light sources of the passing headlights 10 is not limited to three, and may be one or a plurality.
　集光レンズ４０は、発光機構３０に設けられた３つの光源からの光を集光して、後述する導光体６０に向かって光を照射するための部材である。ここで、集光レンズ４０の形状は、左右方向に長い長方形を成す板状である。ただし、光源からの光を集光して導光体６０に向かわせるために、集光レンズ４０の表面が曲面である場合や、集光レンズ４０の表面に凹凸が設けられている場合がある。また、集光レンズ４０の後方の面は、発光機構３０が有する基板上に設けられた光源の形状に合わせて、凹凸及び曲面が設けられている。さらに、集光レンズ４０が成す長方形における左右方向の両端には、一つずつ集光レンズ４０を貫通する孔がある。そして、集光レンズ４０に設けられた孔にボルトを通すことで、ヒートシンク２０に集光レンズ４０が締結される。このとき、集光レンズ４０は、ヒートシンク２０との間に発光機構３０を挟んで締結される。その結果、図２に示すように、発光機構３０と集光レンズ４０とは、密着した状態で、ヒートシンク２０に締結される。 The condensing lens 40 is a member for condensing light from three light sources provided in the light emitting mechanism 30 and irradiating the light toward the light guide body 60 described later. Here, the shape of the condenser lens 40 is a plate shape that forms a long rectangle in the left-right direction. However, in order to collect the light from the light source and direct it toward the light guide body 60, the surface of the condensing lens 40 may be a curved surface, or the surface of the condensing lens 40 may be provided with irregularities. .. Further, the rear surface of the condenser lens 40 is provided with irregularities and curved surfaces according to the shape of the light source provided on the substrate of the light emitting mechanism 30. Further, there are holes that penetrate the condenser lens 40 one by one at both ends in the left-right direction in the rectangle formed by the condenser lens 40. Then, the condenser lens 40 is fastened to the heat sink 20 by passing a bolt through the hole provided in the condenser lens 40. At this time, the condenser lens 40 is fastened with the light emitting mechanism 30 sandwiched between the heat sink 20 and the heat sink 20. As a result, as shown in FIG. 2, the light emitting mechanism 30 and the condenser lens 40 are fastened to the heat sink 20 in close contact with each other.
　遮光部材５０は、図１に示すように、集光レンズ４０と導光体６０との間に位置する部材である。ここで、集光レンズ４０よりも後方に発光機構３０があり、導光体６０よりも前方に後述するカバー７０がある。従って、集光レンズ４０と導光体６０との間に位置する遮光部材５０は、発光機構３０とカバー７０との間に位置していることになる。また、遮光部材５０は、発光機構３０からカバー７０に向かう方向と平行な方向から見たときに、カバー７０と重なる位置にある。さらに、遮光部材５０は、導光体保持部５１、第１締結アーム５２、第２締結アーム５３、及び第３締結アーム５４を有する。 As shown in FIG. 1, the light-shielding member 50 is a member located between the condenser lens 40 and the light guide body 60. Here, the light emitting mechanism 30 is located behind the condenser lens 40, and the cover 70, which will be described later, is located in front of the light guide body 60. Therefore, the light-shielding member 50 located between the condenser lens 40 and the light guide 60 is located between the light emitting mechanism 30 and the cover 70. Further, the light-shielding member 50 is located at a position overlapping the cover 70 when viewed from a direction parallel to the direction from the light emitting mechanism 30 toward the cover 70. Further, the light-shielding member 50 has a light guide body holding portion 51, a first fastening arm 52, a second fastening arm 53, and a third fastening arm 54.
　導光体保持部５１は、上下方向及び左右方向に平行な六角形の平面を成す遮蔽部５１Ｓと、この遮蔽部５１Ｓの外縁から後方に向かって伸びる部分５１Ｅを有する。そして、導光体保持部５１を前後方向から見ると、上下方向における中央に、左右方向に長い長方形を成す孔である長孔５５が設けられている。導光体保持部５１は、この長孔５５の縁からも後方に向かって伸びる部分を有している。また、長孔５５には、後述する導光体６０の入射部６１が収まる。そして、導光体保持部５１の前面には、３つのねじ穴が設けられている。１つのねじ穴は、導光体保持部５１の中央に設けられた長孔５５に対して上側に位置し、残り２つのねじ穴は、長孔５５に対して下側に位置する。導光体保持部５１の前面に設けられたこれらの３つのねじ穴には、後述する導光体６０を締結するためのボルトが挿入される。 The light guide body holding portion 51 has a shielding portion 51S forming a hexagonal plane parallel to the vertical direction and the horizontal direction, and a portion 51E extending rearward from the outer edge of the shielding portion 51S. When the light guide body holding portion 51 is viewed from the front-rear direction, an elongated hole 55, which is a hole forming a long rectangle in the left-right direction, is provided at the center in the up-down direction. The light guide body holding portion 51 also has a portion extending rearward from the edge of the elongated hole 55. Further, the incident portion 61 of the light guide body 60, which will be described later, is accommodated in the elongated hole 55. Three screw holes are provided on the front surface of the light guide body holding portion 51. One screw hole is located above the elongated hole 55 provided in the center of the light guide body holding portion 51, and the remaining two screw holes are located below the elongated hole 55. Bolts for fastening the light guide body 60, which will be described later, are inserted into these three screw holes provided on the front surface of the light guide body holding portion 51.
　遮光部材５０における第１締結アーム５２は、導光体保持部５１の上部から上方向に向かって伸びる板状の部分である。また、前後方向から見て第１締結アーム５２における中央には、第１締結アーム５２をヒートシンク２０の第１締結部２２に締結するための孔が設けられている。第２締結アーム５３は、導光体保持部５１の下部の右側から下方向に向かって伸びる板状の部分である。また、前後方向から見て第２締結アーム５３における中央にも、第２締結アーム５３をヒートシンク２０の第２締結部２３に締結するための孔が設けられている。第３締結アーム５４は、導光体保持部５１の下部の左側から下方向に向かって伸びる板状の部分である。また、前後方向から見て第３締結アーム５４における中央にも、第３締結アーム５４をヒートシンク２０の第２締結部２３に締結するための孔が設けられている。そして、第１締結アーム５２がヒートシンク２０の第１締結部２２にボルトにより締結され、第２締結アーム５３がヒートシンク２０の第２締結部２３にボルトにより締結され、さらに、第３締結アーム５４がヒートシンク２０の第２締結部２３にボルトにより締結されることで、遮光部材５０は、ヒートシンク２０に固定される。 The first fastening arm 52 in the light-shielding member 50 is a plate-shaped portion extending upward from the upper part of the light guide body holding portion 51. Further, a hole for fastening the first fastening arm 52 to the first fastening portion 22 of the heat sink 20 is provided in the center of the first fastening arm 52 when viewed from the front-rear direction. The second fastening arm 53 is a plate-shaped portion extending downward from the right side of the lower portion of the light guide body holding portion 51. Further, a hole for fastening the second fastening arm 53 to the second fastening portion 23 of the heat sink 20 is also provided in the center of the second fastening arm 53 when viewed from the front-rear direction. The third fastening arm 54 is a plate-shaped portion extending downward from the left side of the lower portion of the light guide body holding portion 51. Further, a hole for fastening the third fastening arm 54 to the second fastening portion 23 of the heat sink 20 is also provided in the center of the third fastening arm 54 when viewed from the front-rear direction. Then, the first fastening arm 52 is bolted to the first fastening portion 22 of the heat sink 20, the second fastening arm 53 is bolted to the second fastening portion 23 of the heat sink 20, and the third fastening arm 54 is further fastened. The light-shielding member 50 is fixed to the heat sink 20 by being fastened to the second fastening portion 23 of the heat sink 20 with bolts.
　導光体６０は、図１に示すように、遮光部材５０を挟んで集光レンズ４０の前方に位置し、発光機構３０が有する光源から発せられ集光レンズ４０を介して入射した光を前方に向かって照射する部材である。そして、導光体６０は、図２に示すように、入射部６１、出射部６３、及び取付け部６６を有している。 As shown in FIG. 1, the light guide body 60 is located in front of the condensing lens 40 with the light-shielding member 50 interposed therebetween, and forwards the light emitted from the light source of the light emitting mechanism 30 and incident through the condensing lens 40. It is a member that irradiates toward. Then, as shown in FIG. 2, the light guide body 60 has an incident portion 61, an exit portion 63, and an attachment portion 66.
　入射部６１は、発光機構３０から発せられ集光レンズ４０を通過した光が導光体６０に入射する部分である。従って、入射部６１は、発光機構３０と一体となった集光レンズ４０と対向している。また、入射部６１は、直方体に近い形状を成している。ただし、図３に示すように、入射部６１の下部は、一部カットされている。これは、入射部６１の一部をカットすることで形成された平面である全反射面６１Ｒで、発光機構３０から導光体６０に入射した光を全反射させ、導光体６０の前方に位置する出射部６３に設けられた出射面６３１に向かわせるためである。なお、前述のとおり、入射部６１は遮光部材５０の長孔５５から後方に向かって張り出しているため、発光機構３０からの光は遮光部材５０に邪魔されることなく、入射部６１に届く。 The incident portion 61 is a portion where the light emitted from the light emitting mechanism 30 and passing through the condenser lens 40 is incident on the light guide body 60. Therefore, the incident portion 61 faces the condensing lens 40 integrated with the light emitting mechanism 30. Further, the incident portion 61 has a shape close to that of a rectangular parallelepiped. However, as shown in FIG. 3, the lower part of the incident portion 61 is partially cut. This is a total reflection surface 61R which is a flat surface formed by cutting a part of the incident portion 61, and totally reflects the light incident on the light guide body 60 from the light emitting mechanism 30 and is in front of the light guide body 60. This is to direct the light toward the light emitting surface 631 provided on the light emitting unit 63 located. As described above, since the incident portion 61 projects rearward from the elongated hole 55 of the light-shielding member 50, the light from the light emitting mechanism 30 reaches the incident portion 61 without being disturbed by the light-shielding member 50.
　出射部６３は、入射部６１の全反射面６１Rで全反射した光を、前方に向かって出射する部分であり、前後方向において入射部６１と接している。具体的には、入射部６１の全反射面６１Ｒで全反射した光が、導光体６０の前方に位置する出射部６３の出射面６３１から出射される。また、図２に示すように、出射部６３の形状は、円柱をその中心軸と平行な方向で半分に切断した形状を成している。そして、出射部６３が成す立体において、前方に位置する曲面が出射面６３１である。また、出射部６３が成す立体において、出射面６３１に対して下部に位置して下側を向く面が下面６３２であり、出射面６３１に対して上部に位置して上側を向く面が上面６３３である。さらに、図４に示すように、下面６３２には、左右方向に平行な溝６３２Ｇが設けられている。また、図５に示すように、上面６３３にも、左右方向に平行な溝６３３Ｇが、設けられている。なお、溝６３２Ｇにおいて、溝６３２Ｇが伸びる方向、つまり、左右方向と直交する断面の形状は、開口部から底部に向かって幅が狭くなる三角形を成している。また、溝６３３Ｇにおいて、溝６３３Ｇが伸びる方向、つまり、左右方向と直交する断面の形状は、開口部から底部に向かって幅が狭くなる三角形を成している。 The exiting portion 63 is a portion that emits the light totally reflected by the totally reflecting surface 61R of the incident portion 61 toward the front, and is in contact with the incident portion 61 in the front-rear direction. Specifically, the light totally reflected by the total reflection surface 61R of the incident portion 61 is emitted from the emission surface 631 of the emission portion 63 located in front of the light guide body 60. Further, as shown in FIG. 2, the shape of the exit portion 63 is such that the cylinder is cut in half in the direction parallel to the central axis thereof. Then, in the solid formed by the exit portion 63, the curved surface located in front is the exit surface 631. Further, in the solid formed by the exit portion 63, the surface located below the exit surface 631 and facing downward is the lower surface 632, and the surface located above the exit surface 631 and facing upward is the upper surface 633. Is. Further, as shown in FIG. 4, the lower surface 632 is provided with a groove 632G parallel to the left-right direction. Further, as shown in FIG. 5, a groove 633G parallel to the left-right direction is also provided on the upper surface 633. In the groove 632G, the direction in which the groove 632G extends, that is, the shape of the cross section orthogonal to the left-right direction forms a triangle in which the width narrows from the opening to the bottom. Further, in the groove 633G, the shape of the cross section orthogonal to the extending direction of the groove 633G, that is, the left-right direction forms a triangle whose width narrows from the opening to the bottom.
　取付け部６６は、図４及び図５に示すように、出射部６３の後方の端部から、上下方向及び左右方向に広がる板状の部分である。ここで、取付け部６６において、出射部６３に対して上方向に広がる部分の左右方向の中央には、取付け部６６を前後方向に貫通する貫通孔６６１が設けられている。また、取付け部６６において、出射部６３に対して右方向に広がる部分の下端にも、取付け部６６を前後方向に貫通する貫通孔６６２が設けられている。さらに、取付け部６６において、出射部６３に対して左方向に広がる部分の下端にも、取付け部６６を前後方向に貫通する貫通孔６６３が設けられている。そして、貫通孔６６１、貫通孔６６２及び貫通孔６６３にボルトが通されることで、遮光部材５０の導光体保持部５１に導光体６０が締結される。 As shown in FIGS. 4 and 5, the mounting portion 66 is a plate-shaped portion extending in the vertical direction and the horizontal direction from the rear end portion of the emitting portion 63. Here, in the mounting portion 66, a through hole 661 that penetrates the mounting portion 66 in the front-rear direction is provided at the center in the left-right direction of the portion that extends upward with respect to the emitting portion 63. Further, in the mounting portion 66, a through hole 662 that penetrates the mounting portion 66 in the front-rear direction is also provided at the lower end of the portion that extends to the right with respect to the emitting portion 63. Further, in the mounting portion 66, a through hole 663 that penetrates the mounting portion 66 in the front-rear direction is also provided at the lower end of the portion that extends to the left with respect to the emitting portion 63. Then, the bolt is passed through the through hole 661, the through hole 662, and the through hole 663, so that the light guide body 60 is fastened to the light guide body holding portion 51 of the light shielding member 50.
　カバー７０は、図１に示すように、導光体６０の前方側の面を覆う樹脂製のカバーである。また、カバー７０は、導光体６０の下面６３２及び導光体６０の上面６３３を覆うとともに、導光体６０の取付け部６６の前面も覆っている。つまり、カバー７０は、導光体６０の下面６３２及び導光体６０の上面６３３のうち溝が設けられた面を覆うとともに、導光体６０の取付け部６６の前面も覆っている。ただし、発光機構３０の光源から発せられ導光体６０を通過した光を前方に照射するために、前方側から見たときに、導光体６０の出射面６３１は、カバー７０によって覆われていない。 As shown in FIG. 1, the cover 70 is a resin cover that covers the front surface of the light guide body 60. Further, the cover 70 covers the lower surface 632 of the light guide body 60 and the upper surface 633 of the light guide body 60, and also covers the front surface of the mounting portion 66 of the light guide body 60. That is, the cover 70 covers the surface of the lower surface 632 of the light guide body 60 and the upper surface 633 of the light guide body 60 where the groove is provided, and also covers the front surface of the mounting portion 66 of the light guide body 60. However, in order to irradiate the light emitted from the light source of the light emitting mechanism 30 and passing through the light guide body 60 forward, the exit surface 631 of the light guide body 60 is covered with the cover 70 when viewed from the front side. No.
　次に、すれ違い用前照灯１０の動作について説明する。図６は、実施の形態１に係るすれ違い用前照灯における導光体内部を通過する光の経路を示す断面図である。図７は、実施の形態１に係るすれ違い用前照灯における導光体内部を通過する光の経路及び溝を拡大した断面図である。なお、図７における一点鎖線は、後述する透過部６３２Ｓ、６３３Ｓがなす平面の法線を表す。 Next, the operation of the passing headlight 10 will be described. FIG. 6 is a cross-sectional view showing a path of light passing through the inside of the light guide body in the passing headlight according to the first embodiment. FIG. 7 is an enlarged cross-sectional view of a path and a groove of light passing through the inside of the light guide body in the passing headlight according to the first embodiment. The alternate long and short dash line in FIG. 7 represents the normal line of the plane formed by the transmission portions 632S and 633S, which will be described later.
　まず、発光機構３０の有する電気回路に通電することで、発光機構３０が有する光源である３つの発光ダイオードが発光する。そして、図６に示すように、３つの発光ダイオードから発せられた光は、集光レンズ４０で集光されて、導光体６０に向かう。導光体６０に向かった光は、導光体６０の入射部６１の後方の面から、導光体６０内部に入射する。導光体６０内部に入射した光の大部分は、図６の実線で示すように、入射部６１の全反射面６１Ｒで全反射して、導光体６０の出射面６３１から出射され、すれ違い用前照灯１０が取り付けられた車両の前方を照らす。ただし、導光体６０に入射した光の一部は、図６の破線で示すように、全反射面６１Ｒで全反射せずに下面６３２に向かう、又は、全反射面６１Ｒで全反射した後に、出射面６３１に向かわず上面６３３に向かう。 First, by energizing the electric circuit of the light emitting mechanism 30, three light emitting diodes which are light sources of the light emitting mechanism 30 emit light. Then, as shown in FIG. 6, the light emitted from the three light emitting diodes is condensed by the condenser lens 40 and directed toward the light guide body 60. The light directed to the light guide body 60 is incident on the inside of the light guide body 60 from the surface behind the incident portion 61 of the light guide body 60. As shown by the solid line in FIG. 6, most of the light incident on the inside of the light guide body 60 is totally reflected by the total reflection surface 61R of the incident portion 61, emitted from the exit surface 631 of the light guide body 60, and passes each other. Illuminates the front of the vehicle to which the headlight 10 is attached. However, as shown by the broken line in FIG. 6, a part of the light incident on the light guide 60 heads toward the lower surface 632 without being totally reflected by the total reflection surface 61R, or after being totally reflected by the total reflection surface 61R. , Not toward the exit surface 631 but toward the upper surface 633.
　ここで、下面６３２には、溝６３２Ｇが設けられている。これにより、図７に示すように、下面６３２には、前後方向及び上下方向に平行、又は、平行に近い面を成す透過部６３２Ｓが形成される。そして、下面６３２に到達した光の多くは、溝６３２Ｇによって形成された透過部６３２Ｓに入射する。このとき、透過部６３２Ｓが成す平面の法線と透過部６３２Ｓに入射した光の進行方向との成す角度、つまり、入射角α１は、臨界角よりも小さくなる。その結果、下面６３２に到達した光は、下面６３２で全反射せずに、下面６３２の透過部６３２Ｓを透過して、下面６３２から導光体６０の外部に出て、その後、下方向に向かう。そして、下面６３２から下方向に向かった光は、図６に示すように、カバー７０により遮光される。 Here, the lower surface 632 is provided with a groove 632G. As a result, as shown in FIG. 7, a transmission portion 632S forming a surface parallel to or nearly parallel to the front-rear direction and the vertical direction is formed on the lower surface 632. Then, most of the light that has reached the lower surface 632 is incident on the transmission portion 632S formed by the groove 632G. At this time, the angle formed by the normal line of the plane formed by the transmitting portion 632S and the traveling direction of the light incident on the transmitting portion 632S, that is, the incident angle α1, is smaller than the critical angle. As a result, the light that has reached the lower surface 632 is not totally reflected by the lower surface 632, but is transmitted through the transmitting portion 632S of the lower surface 632, exits from the lower surface 632 to the outside of the light guide body 60, and then heads downward. .. Then, the light directed downward from the lower surface 632 is blocked by the cover 70 as shown in FIG.
　また、上面６３３にも、溝６３３Ｇが設けられている。これにより、図７に示すように、上面６３３には、前後方向及び上下方向に平行、又は、平行に近い面を成す透過部６３３Ｓが形成される。そして、上面６３３に到達した光の多くは、溝６３３Ｇによって形成された透過部６３３Ｓに入射する。このとき、透過部６３３Ｓが成す平面の法線と透過部６３３Ｓに入射した光の進行方向との成す角度、つまり、入射角α２は、臨界角よりも小さくなる。その結果、上面６３３に到達した光は、上面６３３で全反射せずに、上面６３３の透過部６３３Ｓを透過して、上面６３３から導光体６０の外部に出て、その後、上方向に向かう。そして、上面６３３から上方向に向かった光は、図６に示すように、カバー７０により遮光される。 A groove 633G is also provided on the upper surface 633. As a result, as shown in FIG. 7, a transmission portion 633S forming a surface parallel to or close to parallel in the front-rear direction and the vertical direction is formed on the upper surface 633. Then, most of the light that has reached the upper surface 633 is incident on the transmission portion 633S formed by the groove 633G. At this time, the angle formed by the normal line of the plane formed by the transmitting portion 633S and the traveling direction of the light incident on the transmitting portion 633S, that is, the incident angle α2 is smaller than the critical angle. As a result, the light that has reached the upper surface 633 is not totally reflected by the upper surface 633, but is transmitted through the transmitting portion 633S of the upper surface 633, exits from the upper surface 633 to the outside of the light guide body 60, and then heads upward. .. Then, the light directed upward from the upper surface 633 is blocked by the cover 70 as shown in FIG.
　以上のように構成されたすれ違い用前照灯１０の効果について説明する。図８は、比較例に係るすれ違い用前照灯における導光体内部を通過する光の経路を示す断面図である。図９は、比較例に係るすれ違い用前照灯におけるカバーに向かう光の経路を示す断面図である。図１０は、実施の形態１に係るすれ違い用前照灯におけるカバーに向かおうとする光の経路を示す断面図である。 The effect of the passing headlight 10 configured as described above will be described. FIG. 8 is a cross-sectional view showing a path of light passing through the inside of the light guide body in the passing headlight according to the comparative example. FIG. 9 is a cross-sectional view showing a path of light toward the cover in the passing headlight according to the comparative example. FIG. 10 is a cross-sectional view showing a path of light toward the cover in the passing headlight according to the first embodiment.
　すれ違い用前照灯１０は、照射すべき方向以外の方向を照らすことを抑制することができる。具体的には、前述のとおり、導光体６０に入射した光の一部は、全反射面６１Ｒで全反射せずに下面６３２に向かう。ここで、図８に示すように、導光体６０の下面６３２が平面である場合、導光体６０に入射して下面６３２に到達した光は、下面６３２で全反射して出射面６３１に向かい、導光体６０から出射される。このようにして、導光体６０から出射された光は、すれ違い用前照灯が照射すべき方向よりも上方向を照射し、対向車や前走車にグレアを与えてしまう。しかし、すれ違い用前照灯１０では、図７に示すように、導光体６０の下面６３２に溝６３２Ｇが設けられている。これにより、下面６３２には、前後方向及び上下方向に平行、又は、平行に近い面を成す透過部６３２Ｓが形成される。そして、下面６３２に到達した光の多くは、溝６３２Ｇによって形成された透過部６３２Ｓに入射する。このとき、透過部６３２Ｓが成す平面の法線と透過部６３２Ｓに入射した光の進行方向との成す角度、つまり、入射角α１は、臨界角よりも小さくなる。その結果、下面６３２に到達した光は、下面６３２で全反射せずに、下面６３２の透過部６３２Ｓを透過して、下面６３２から導光体６０の外部に出て、その後、下方向に向かう。そして、下面６３２から下方向に向かった光は、カバー７０により遮光される。その結果、下面６３２で全反射して出射面６３１に向かった光が、すれ違い用前照灯が照射すべき方向よりも上方向を照射し、グレアを発生させるという事態を抑制できる。つまり、すれ違い用前照灯１０は、照射すべき方向以外の方向を照らすことを抑制することができる。 The passing headlight 10 can suppress illumination in a direction other than the direction to be irradiated. Specifically, as described above, a part of the light incident on the light guide 60 is directed to the lower surface 632 without being totally reflected by the total reflection surface 61R. Here, as shown in FIG. 8, when the lower surface 632 of the light guide body 60 is flat, the light incident on the light guide body 60 and reaching the lower surface 632 is totally reflected by the lower surface 632 and is reflected on the exit surface 631. It faces and is emitted from the light guide body 60. In this way, the light emitted from the light guide body 60 irradiates the light in the direction higher than the direction in which the passing headlights should irradiate, and gives glare to the oncoming vehicle and the vehicle in front. However, in the passing headlight 10, as shown in FIG. 7, a groove 632G is provided on the lower surface 632 of the light guide body 60. As a result, the lower surface 632 is formed with a transmission portion 632S forming a surface parallel to or nearly parallel to the front-rear direction and the vertical direction. Then, most of the light that has reached the lower surface 632 is incident on the transmission portion 632S formed by the groove 632G. At this time, the angle formed by the normal line of the plane formed by the transmitting portion 632S and the traveling direction of the light incident on the transmitting portion 632S, that is, the incident angle α1, is smaller than the critical angle. As a result, the light that has reached the lower surface 632 is not totally reflected by the lower surface 632, but is transmitted through the transmitting portion 632S of the lower surface 632, exits from the lower surface 632 to the outside of the light guide body 60, and then heads downward. .. Then, the light directed downward from the lower surface 632 is blocked by the cover 70. As a result, it is possible to suppress a situation in which the light that is totally reflected by the lower surface 632 and directed toward the exit surface 631 irradiates in a direction higher than the direction in which the passing headlight should irradiate, causing glare. That is, the passing headlight 10 can suppress the illumination in a direction other than the direction to be irradiated.
　また、前述のとおり、導光体６０に入射した光の一部は、全反射面６１Ｒで全反射した後に、出射面６３１に向かわず上面６３３に向かう。ここで、図８に示すように、導光体６０の上面６３３が平面である場合、導光体６０に入射して上面６３３に到達した光は、上面６３３で全反射して出射面６３１に向かい、導光体６０から出射される。このようにして、導光体６０から出射された光は、すれ違い用前照灯が照射すべき方向よりも下方向を照射し、照射ムラを発生させる。しかし、すれ違い用前照灯１０では、上面６３３にも、溝６３３Ｇが設けられている。これにより、図７に示すように、上面６３３には、前後方向及び上下方向と平行、又は、平行に近い面を成す透過部６３３Ｓが形成される。そして、上面６３３に到達した光の多くは、溝６３３Ｇによって形成された透過部６３３Ｓに入射する。このとき、透過部６３３Ｓが成す平面の法線と透過部６３３Ｓに入射した光の進行方向との成す角度、つまり、入射角α２は、臨界角よりも小さくなる。その結果、上面６３３に到達した光は、上面６３３で全反射せずに、上面６３３の透過部６３３Ｓを透過して、上面６３３から導光体６０の外部に出て、その後、上方向に向かう。そして、上方向に向かった光は、カバー７０により遮光される。その結果、上面６３３で全反射して出射面６３１に向かった光が、すれ違い用前照灯が照射すべき方向よりも下方向を照射し、照射ムラを発生させるという事態を抑制できる。つまり、すれ違い用前照灯１０は、照射すべき方向以外の方向を照らすことを抑制することができる。 Further, as described above, a part of the light incident on the light guide body 60 is totally reflected by the total reflection surface 61R, and then goes to the upper surface 633 instead of the exit surface 631. Here, as shown in FIG. 8, when the upper surface 633 of the light guide body 60 is flat, the light incident on the light guide body 60 and reaching the upper surface 633 is totally reflected by the upper surface 633 and is reflected on the exit surface 631. It faces and is emitted from the light guide body 60. In this way, the light emitted from the light guide body 60 irradiates in a direction lower than the direction to be irradiated by the passing headlights, and causes irradiation unevenness. However, in the passing headlight 10, the groove 633G is also provided on the upper surface 633. As a result, as shown in FIG. 7, a transmission portion 633S forming a surface parallel to or nearly parallel to the front-rear direction and the vertical direction is formed on the upper surface 633. Then, most of the light that has reached the upper surface 633 is incident on the transmission portion 633S formed by the groove 633G. At this time, the angle formed by the normal line of the plane formed by the transmitting portion 633S and the traveling direction of the light incident on the transmitting portion 633S, that is, the incident angle α2 is smaller than the critical angle. As a result, the light that has reached the upper surface 633 is not totally reflected by the upper surface 633, but is transmitted through the transmitting portion 633S of the upper surface 633, exits from the upper surface 633 to the outside of the light guide body 60, and then heads upward. .. Then, the light directed upward is blocked by the cover 70. As a result, it is possible to suppress a situation in which the light that is totally reflected by the upper surface 633 and directed toward the exit surface 631 irradiates in a direction lower than the direction in which the passing headlight should be irradiated, causing uneven irradiation. That is, the passing headlight 10 can suppress the illumination in a direction other than the direction to be irradiated.
　これに加え、すれ違い用前照灯１０は、遮光部材５０によって、照射すべき方向以外の方向を照らすことをさらに抑制することができる。具体的には、図９に示すように、仮に、遮光部材５０が存在しない場合、発光機構３０から発せられた光の一部が、直線的にカバー７０に向かい、カバー７０における、導光体６０の下面６３２を覆う面で反射する。そして、カバー７０における、導光体６０の下面６３２を覆う面で反射した光は、前方に出射されて、すれ違い用前照灯が照射すべき方向よりも上方向を照射し、対向車や前走車にグレアを与えてしまう。しかし、すれ違い用前照灯１０では、図１０に示すように、遮光部材５０を備えている。そして、遮光部材５０は、発光機構３０とカバー７０との間に位置し、発光機構３０からカバー７０に向かう方向と平行な方向から見たときに、カバー７０と重なる位置にある。これにより、発光機構３０から発せられ、直線的にカバー７０に向かおうとする光が遮光される。その結果、発光機構３０から発せられ、直線的にカバー７０に向かおうとする光が、カバー７０における、導光体６０の下面６３２を覆う面で反射することが抑制される。その結果、すれ違い用前照灯１０では、照射すべき方向以外の方向を照らすことを抑制することができる。なお、上記では、カバー７０における導光体６０の下面６３２を覆う面で反射する光について例示したが、発光機構３０から発せられ、カバー７０における導光体６０の上面６３３を覆う面に直線的に向かおうとする光に対しても、遮光部材５０は同様の効果を有する。また、遮光部材５０が存在しない場合、導光体６０は、例えば、ヒートシンク２０に直接締結されるなどの方法により固定される。 In addition to this, the passing headlight 10 can be further suppressed from illuminating in a direction other than the direction to be irradiated by the light-shielding member 50. Specifically, as shown in FIG. 9, if the light-shielding member 50 is not present, a part of the light emitted from the light emitting mechanism 30 linearly heads toward the cover 70, and the light guide body in the cover 70. Reflects on the surface covering the lower surface 632 of 60. Then, the light reflected by the surface of the cover 70 that covers the lower surface 632 of the light guide body 60 is emitted forward and irradiates in a direction higher than the direction in which the passing headlight should irradiate, and the oncoming vehicle or the front It gives glare to the running vehicle. However, as shown in FIG. 10, the passing headlight 10 is provided with a light-shielding member 50. The light-shielding member 50 is located between the light emitting mechanism 30 and the cover 70, and is located at a position overlapping the cover 70 when viewed from a direction parallel to the direction from the light emitting mechanism 30 toward the cover 70. As a result, the light emitted from the light emitting mechanism 30 and going straight toward the cover 70 is blocked. As a result, the light emitted from the light emitting mechanism 30 and going linearly toward the cover 70 is suppressed from being reflected by the surface of the cover 70 that covers the lower surface 632 of the light guide body 60. As a result, the passing headlight 10 can suppress the illumination in a direction other than the direction to be irradiated. In the above description, the light reflected by the surface of the cover 70 that covers the lower surface 632 of the light guide 60 is illustrated, but the light is emitted from the light emitting mechanism 30 and is linear to the surface of the cover 70 that covers the upper surface 633 of the light guide 60. The light-shielding member 50 has the same effect on the light that tends toward the light. When the light-shielding member 50 is not present, the light guide body 60 is fixed by, for example, being directly fastened to the heat sink 20.
　実施の形態２．
　図１１は、実施の形態２に係るすれ違い用前照灯が備える導光体に設けられた溝の角部分の拡大図である。図１２は、比較例に係るすれ違い用前照灯における導光体内部を通過する光の経路を示す断面図である。実施の形態２に係るすれ違い用前照灯と実施の形態１に係すれ違い用前照灯との相違点は、実施の形態２に係るすれ違い用前照灯では、導光体６０に設けられた溝６３２Ｇ及び溝６３３Gにおける底部の表面に、図１１に示すように、凹凸が設けられている点である。 Embodiment 2.
FIG. 11 is an enlarged view of a corner portion of a groove provided in a light guide body included in the passing headlight according to the second embodiment. FIG. 12 is a cross-sectional view showing a path of light passing through the inside of the light guide body in the passing headlight according to the comparative example. The difference between the passing headlights according to the second embodiment and the passing headlights according to the first embodiment is that the passing headlights according to the second embodiment are provided on the light guide body 60. As shown in FIG. 11, the bottom surface of the groove 632G and the groove 633G is provided with irregularities.
　実施の形態２に係るすれ違い用前照灯では、実施の形態１に係るすれ違い用前照灯と比較して、照射すべき方向以外の方向を照らすことをさらに抑制することができる。具体的には、図１２に示すように、導光体６０に設けられた溝６３２Ｇ及び溝６３３Ｇにおける底部の角部分は、完全に尖った形状とすることは現実的に難しく、丸みを帯びた形状になる。ここで、前述のとおり、導光体６０の下面６３２や上面６３３に向かった光の多くは、溝６３２Ｇにより形成された透過部６３２Ｓ、又は溝６３３Ｇにより形成された透過部６３３Ｓを透過して、カバー７０により遮光される。しかし、導光体６０の下面６３２や上面６３３に向かった光の一部は、溝６３２Ｇ及び溝６３３Ｇの角部分に向かう。そして、溝６３２Ｇ及び溝６３３Ｇの角部分に向かった光の入射角は、溝６３２Ｇ及び溝６３３Ｇの角部分が丸くなっているため、大きくなる。その結果、導光体６０の下面６３２や上面６３３に向かった光のうち、溝６３２Ｇ及び溝６３３Ｇの角部分に向かった光は、溝６３２Ｇ及び溝６３３Ｇの角部分で全反射し、出射面６３１に向かってしまう。従って、下面６３２及び上面６３３に溝６３２Ｇ及び溝６３３Ｇが設けられていたとしても、導光体６０の下面６３２や上面６３３に向かった光の一部は、出射面６３１に向かってしまい、すれ違い用前照灯１０が照射すべき方向以外の方向を照らすという結果をもたらす。このような状況を抑制するため、実施の形態２に係るすれ違い用前照灯では、導光体６０に設けられた溝６３２Ｇ及び溝６３３Ｇにおける底部の角部分の表面に、図１１に示すように、凹凸が設けられている。これにより、導光体６０の下面６３２や上面６３３に向かった光のうち、溝６３２Ｇ及び溝６３３Ｇの角部分に向かった光は、溝６３２Ｇ及び溝６３３Ｇの角部分の凹凸により乱反射する。その結果、導光体６０の下面６３２や上面６３３に向かった光のうち、溝６３２Ｇ及び溝６３３Ｇの角部分に向かった光が、溝６３２Ｇ及び溝６３３Ｇの角部分で全反射し、出射面６３１に向かってしまうという事態が軽減される。従って、実施の形態２に係るすれ違い用前照灯では、実施の形態１に係るすれ違い用前照灯と比較して、照射すべき方向以外の方向を照らすことをさらに抑制することができる。なお、 The passing headlight according to the second embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment. Specifically, as shown in FIG. 12, the corner portions of the bottom of the groove 632G and the groove 633G provided in the light guide body 60 are practically difficult to have a completely sharp shape and are rounded. Become a shape. Here, as described above, most of the light directed toward the lower surface 632 and the upper surface 633 of the light guide 60 passes through the transmission portion 632S formed by the groove 632G or the transmission portion 633S formed by the groove 633G. It is shielded from light by the cover 70. However, a part of the light directed to the lower surface 632 and the upper surface 633 of the light guide 60 is directed to the corners of the groove 632G and the groove 633G. Then, the incident angle of the light directed toward the corner portions of the groove 632G and the groove 633G becomes large because the corner portions of the groove 632G and the groove 633G are rounded. As a result, among the light directed to the lower surface 632 and the upper surface 633 of the light guide body 60, the light directed to the corners of the groove 632G and the groove 633G is totally reflected at the corners of the groove 632G and the groove 633G, and the light is totally reflected at the corners of the groove 632G and the groove 633G. I will go to. Therefore, even if the lower surface 632 and the upper surface 633 are provided with the groove 632G and the groove 633G, a part of the light directed toward the lower surface 632 and the upper surface 633 of the light guide body 60 is directed toward the exit surface 631 and is used for passing each other. The result is that the headlight 10 illuminates a direction other than the direction to be irradiated. In order to suppress such a situation, in the passing headlight according to the second embodiment, as shown in FIG. 11, on the surface of the bottom corner portion of the groove 632G and the groove 633G provided in the light guide body 60, as shown in FIG. , Unevenness is provided. As a result, among the light directed to the lower surface 632 and the upper surface 633 of the light guide body 60, the light directed to the corners of the groove 632G and the groove 633G is diffusely reflected by the unevenness of the corners of the groove 632G and the groove 633G. As a result, among the light directed to the lower surface 632 and the upper surface 633 of the light guide body 60, the light directed to the corners of the groove 632G and the groove 633G is totally reflected at the corners of the groove 632G and the groove 633G, and the light is totally reflected at the corners of the groove 632G and the groove 633G. The situation of going to is reduced. Therefore, the passing headlight according to the second embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment. note that,
　実施の形態２であるすれ違い用前照灯における他の構成は、実施の形態１であるすれ違い用前照灯と同様である。従って、実施の形態２であるすれ違い用前照灯における他の構成、効果は、実施の形態１であるすれ違い用前照灯での説明のとおりである。 Other configurations of the passing headlights according to the second embodiment are the same as those of the passing headlights according to the first embodiment. Therefore, other configurations and effects in the passing headlight according to the second embodiment are as described in the passing headlight according to the first embodiment.
　実施の形態３．
　図１３は、実施の形態３に係るすれ違い用前照灯が備える導光体の斜視図である。図１４は、実施の形態３に係るすれ違い用前照灯が備える導光体の斜視図である。図１５は、実施の形態１に係るすれ違い用前照灯が備える導光体の平面図である。図１６は、実施の形態１に係るすれ違い用前照灯が備える導光体の平面図である。図１７は、実施の形態３に係るすれ違い用前照灯が備える導光体の平面図である。実施の形態３に係るすれ違い用前照灯と実施の形態１に係すれ違い用前照灯との相違点は、実施の形態３に係るすれ違い用前照灯では、図１３及び図１４に示すように、導光体６０の下面６３２及び上面６３３に設けられた溝６３２Ｇ及び溝６３３Ｇが、導光体６０の出射面６３１と平行に伸びている点である。 Embodiment 3.
FIG. 13 is a perspective view of a light guide body included in the passing headlight according to the third embodiment. FIG. 14 is a perspective view of a light guide body included in the passing headlight according to the third embodiment. FIG. 15 is a plan view of a light guide body included in the passing headlight according to the first embodiment. FIG. 16 is a plan view of a light guide body included in the passing headlight according to the first embodiment. FIG. 17 is a plan view of a light guide body included in the passing headlight according to the third embodiment. The differences between the passing headlights according to the third embodiment and the passing headlights according to the first embodiment are shown in FIGS. 13 and 14 in the passing headlights according to the third embodiment. The groove 632G and the groove 633G provided on the lower surface 632 and the upper surface 633 of the light guide body 60 extend in parallel with the exit surface 631 of the light guide body 60.
　実施の形態３に係るすれ違い用前照灯では、実施の形態１に係るすれ違い用前照灯と比較して、照射すべき方向以外の方向を照らすことをさらに抑制することができる。具体的には、導光体６０内部を通過して導光体６０の出射面６３１から出射される光の経路は、出射面６３１に対して、垂直または垂直に近い方向から入射するように設計されている。また、出射面６３１は、上下方向から見たときに半円を描いている。従って、出射面６３１の左右方向の両端付近から出射される光は、左右方向と平行又は、平行に近い方向から出射面６３１に入射する。これに伴って、下面６３２及び上面６３３における左右方向の両端付近に向かう光の進行方向も、左右方向と平行又は、平行に近い方向になる。このとき、図１５に示す実施の形態１に係る溝６３２Ｇ及び溝６３３Ｇのように、溝６３２Ｇ及び溝６３３Ｇが左右方向と平行な場合、下面６３２及び上面６３３における左右方向の両端付近に向かう光の進行方向と、溝６３２Ｇ及び溝６３３Ｇが伸びる方向は、平行又は平行に近い状態となる。その結果、下面６３２及び上面６３３における左右方向の両端付近に向かう光における、溝６３２Ｇ及び溝６３３Ｇによって形成された透過部６３２Ｓ及び透過部６３３Ｓへの入射角α３、α４は、図１６に示される、下面６３２及び上面６３３における左右方向の中央付近に向かう光における、溝６３２Ｇ及び溝６３３Ｇによって形成された透過部６３２Ｓ及び透過部６３３Ｓへの入射角α５、α６よりも大きくなってしまう。この場合、下面６３２及び上面６３３における左右方向の両端付近に向かう光の多くは、下面６３２及び上面６３３で全反射して出射面６３１から出射され、照射ムラやグレアの原因となる。一方、実施の形態３に係るすれ違い用前照灯では、導光体６０の下面６３２及び上面６３３に設けられた溝６３２Ｇ及び溝６３３Ｇが、導光体６０の出射面６３１と平行に伸びている。これにより、下面６３２及び上面６３３における左右方向の両端付近に向かう光における、溝６３２Ｇ及び溝６３３Ｇによって形成された透過部６３２Ｓ及び透過部６３３Ｓへの入射角α７は、図１７に示すように、溝６３２Ｇ及び溝６３３Ｇが左右方向と平行な場合と比較して、小さくなる。その結果、下面６３２及び上面６３３における左右方向の両端付近に向かった光は、下面６３２及び上面６３３で全反射せずに、下面６３２及び上面６３３から導光体６０の外部に出て、その後、カバー７０により遮光される。従って、実施の形態３にかかるすれ違い用前照灯は、下面６３２及び上面６３３における左右方向の両端付近に向かう光が、下面６３２及び上面６３３で全反射して出射面６３１から出射され、照射ムラやグレアの原因となるという事態を抑制できる。つまり、実施の形態３にかかるすれ違い用前照灯は、実施の形態１に係るすれ違い用前照灯と比較して、照射すべき方向以外の方向を照らすことをさらに抑制することができる。 The passing headlight according to the third embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment. Specifically, the path of light that passes through the inside of the light guide body 60 and is emitted from the light emission surface 631 of the light guide body 60 is designed to be incident on the light emission surface 631 from a direction perpendicular to or close to vertical. Has been done. Further, the exit surface 631 draws a semicircle when viewed from the vertical direction. Therefore, the light emitted from the vicinity of both ends in the left-right direction of the exit surface 631 is incident on the exit surface 631 from a direction parallel to or close to the left-right direction. Along with this, the traveling direction of the light toward both ends in the left-right direction on the lower surface 632 and the upper surface 633 is also parallel to or close to the left-right direction. At this time, when the groove 632G and the groove 633G are parallel to the left-right direction as in the groove 632G and the groove 633G according to the first embodiment shown in FIG. 15, the light directed toward both ends in the left-right direction on the lower surface 632 and the upper surface 633 The traveling direction and the direction in which the groove 632G and the groove 633G extend are parallel or nearly parallel. As a result, the angles of incidence α3 and α4 on the transmitting portion 632S and the transmitting portion 633S formed by the grooves 632G and the groove 633G in the light directed toward both ends in the left-right direction on the lower surface 632 and the upper surface 633 are shown in FIG. The angles of incidence on the transmission portions 632S and the transmission portion 633S formed by the grooves 632G and the grooves 633G in the light directed toward the center in the left-right direction on the lower surface 632 and the upper surface 633 are larger than the incident angles α5 and α6. In this case, most of the light directed to the vicinity of both ends in the left-right direction on the lower surface 632 and the upper surface 633 is totally reflected by the lower surface 632 and the upper surface 633 and emitted from the emission surface 631, causing uneven irradiation and glare. On the other hand, in the passing headlight according to the third embodiment, the grooves 632G and the grooves 633G provided on the lower surface 632 and the upper surface 633 of the light guide body 60 extend in parallel with the exit surface 631 of the light guide body 60. .. As a result, as shown in FIG. 17, the incident angle α7 to the transmission portion 632S and the transmission portion 633S formed by the groove 632G and the groove 633G in the light directed toward both ends in the left-right direction on the lower surface 632 and the upper surface 633 is the groove. It is smaller than the case where the 632G and the groove 633G are parallel to the left-right direction. As a result, the light directed to the vicinity of both ends in the left-right direction on the lower surface 632 and the upper surface 633 is not totally reflected by the lower surface 632 and the upper surface 633, but exits from the lower surface 632 and the upper surface 633 to the outside of the light guide body 60. It is shielded from light by the cover 70. Therefore, in the passing headlight according to the third embodiment, the light directed to the vicinity of both ends in the left-right direction on the lower surface 632 and the upper surface 633 is totally reflected by the lower surface 632 and the upper surface 633 and emitted from the emission surface 631, resulting in uneven irradiation. It is possible to suppress the situation that causes glare. That is, the passing headlight according to the third embodiment can further suppress illuminating a direction other than the direction to be irradiated, as compared with the passing headlight according to the first embodiment.
　実施の形態３であるすれ違い用前照灯における他の構成は、実施の形態１であるすれ違い用前照灯と同様である。従って、実施の形態３であるすれ違い用前照灯における他の構成、効果は、実施の形態１であるすれ違い用前照灯での説明のとおりである。 Other configurations of the passing headlights according to the third embodiment are the same as those of the passing headlights according to the first embodiment. Therefore, other configurations and effects of the passing headlight according to the third embodiment are as described in the passing headlight according to the first embodiment.
　他の実施の形態．
　本開示に係るすれ違い用前照灯は、前述の実施の形態に限らずその要旨の範囲内において変更可能である。例えば、すれ違い用前照灯が照射すべき方向以外の方向を照らすことを抑制するという効果を奏するためには、導光体６０の下面６３２及び上面６３３両方に溝が設けられている必要はなく、下面６３２及び上面６３３の少なくとも一方に溝が設けられていればよい。このとき、カバー７０は、下面６３２及び上面６３３のうち溝が設けられた面を覆っていればよく、下面６３２及び上面６３３の両方を覆っている必要はない。また、溝６３２G及び溝６３３Gの底部の表面に設けられた凹凸は、底部だけでなく溝の表面全体に設けられていてもよいし、いずれか一方の溝の底部の表面だけに設けられていてよい。 Other embodiments.
The passing headlights according to the present disclosure are not limited to the above-described embodiments and can be changed within the scope of the gist thereof. For example, in order to obtain the effect of suppressing the passing headlight from illuminating in a direction other than the direction to be irradiated, it is not necessary to provide grooves on both the lower surface 632 and the upper surface 633 of the light guide body 60. A groove may be provided on at least one of the lower surface 632 and the upper surface 633. At this time, the cover 70 may cover the grooved surface of the lower surface 632 and the upper surface 633, and does not need to cover both the lower surface 632 and the upper surface 633. Further, the unevenness provided on the surface of the bottom of the groove 632G and the groove 633G may be provided not only on the bottom but also on the entire surface of the groove, or may be provided only on the surface of the bottom of either one of the grooves. good.
　さらに、導光体６０の形状は、上述の実施の形態に係る形状に限らず、例えば、図１８に示すように、出射面６３１の法線が前後方向と平行な方向であるようなものであってもよい。このとき、導光体６０の溝は、左右方向と平行である。また、各実施の形態を組み合わせてもよい。 Further, the shape of the light guide body 60 is not limited to the shape according to the above-described embodiment, and for example, as shown in FIG. 18, the normal line of the exit surface 631 is in a direction parallel to the front-rear direction. There may be. At this time, the groove of the light guide body 60 is parallel to the left-right direction. Moreover, you may combine each embodiment.
１０　すれ違い用前照灯、３０　発光機構、５０　遮光部材、６０　導光体、６１　入射部、６１Ｒ　全反射面、６３　出射部、７０　カバー、６３１　出射面、６３２　下面、６３２Ｇ　溝、６３３　上面、６３３Ｇ　溝、 10 headlights for passing, 30 light emitting mechanism, 50 shading member, 60 light guide body, 61 incident part, 61R total reflection surface, 63 exit part, 70 cover, 631 exit surface, 632 bottom surface, 632G groove, 633 top surface, 633G groove,

Claims (5)

  1. 　光を発する発光機構と、
    　前記発光機構から入射した光を全反射させる面である全反射面が設けられた入射部、並びに前記全反射面で全反射した光が出射される出射面、前記出射面の下部に位置して下側を向く下面及び前記出射面の上部に位置して上側を向く上面が設けられるとともに、前記下面又は前記上面の少なくとも一方に溝が設けられた出射部を有する導光体と、
    　前記下面及び前記上面のうち前記溝が設けられた面を覆うカバーと、
    　を備える、すれ違い用前照灯。     A light emitting mechanism that emits light and
    An incident portion provided with a total reflection surface which is a surface for totally reflecting the light incident from the light emitting mechanism, an emission surface from which the light totally reflected by the total reflection surface is emitted, and a lower portion of the emission surface. A light guide body having a lower surface facing downward and an upper surface facing upward located above the exit surface and having a groove on at least one of the lower surface or the upper surface.
    A cover that covers the lower surface and the surface of the upper surface where the groove is provided,
    Headlights for passing each other.
  2. 　前記溝の底部の表面には、凹凸が設けられている、請求項１に記載のすれ違い用前照灯。 The headlight for passing according to claim 1, wherein the surface of the bottom of the groove is provided with irregularities.
  3. 　前記溝は、前記出射面と平行に伸びている、請求項１又は請求項２に記載のすれ違い用前照灯。 The headlight for passing according to claim 1 or 2, wherein the groove extends parallel to the exit surface.
  4. 　前記下面及び前記上面に溝が設けられている、請求項１から請求項３のいずれか一項に記載のすれ違い用前照灯。 The headlight for passing according to any one of claims 1 to 3, wherein a groove is provided on the lower surface and the upper surface.
  5. 　前記発光機構と前記カバーとの間にある部材であって、前記発光機構から前記カバーに向かう方向と平行な方向から見たときに、前記カバーと重なる遮光部材を備える、請求項１から請求項４のいずれか一項に記載のすれ違い用前照灯。 Claims 1 to claim include a member between the light emitting mechanism and the cover, which includes a light shielding member that overlaps the cover when viewed from a direction parallel to the direction from the light emitting mechanism toward the cover. The headlight for passing according to any one of 4.
PCT/JP2020/007941 2020-02-27 2020-02-27 Passing-beam headlight WO2021171460A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011138696A (en) * 2009-12-28 2011-07-14 Koito Mfg Co Ltd Lighting fixture for vehicle
JP2012230862A (en) * 2011-04-27 2012-11-22 Koito Mfg Co Ltd Vehicle lamp
US20140146555A1 (en) * 2012-11-28 2014-05-29 Sl Corporation Lamp assembly for vehicle
JP2015079590A (en) * 2013-10-15 2015-04-23 スタンレー電気株式会社 Vehicle head lamp
JP2015103363A (en) * 2013-11-25 2015-06-04 スタンレー電気株式会社 Light guide plate and vehicular lamp
JP2017522708A (en) * 2014-07-23 2017-08-10 マイオテック パシフィック コーポレーション Fog lamp lens and assembly
JP2017212070A (en) * 2016-05-24 2017-11-30 スタンレー電気株式会社 Vehicular lamp

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011138696A (en) * 2009-12-28 2011-07-14 Koito Mfg Co Ltd Lighting fixture for vehicle
JP2012230862A (en) * 2011-04-27 2012-11-22 Koito Mfg Co Ltd Vehicle lamp
US20140146555A1 (en) * 2012-11-28 2014-05-29 Sl Corporation Lamp assembly for vehicle
JP2015079590A (en) * 2013-10-15 2015-04-23 スタンレー電気株式会社 Vehicle head lamp
JP2015103363A (en) * 2013-11-25 2015-06-04 スタンレー電気株式会社 Light guide plate and vehicular lamp
JP2017522708A (en) * 2014-07-23 2017-08-10 マイオテック パシフィック コーポレーション Fog lamp lens and assembly
JP2017212070A (en) * 2016-05-24 2017-11-30 スタンレー電気株式会社 Vehicular lamp

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