JP6443676B2 - LIGHTING DEVICE AND MOBILE BODY HAVING LIGHTING DEVICE - Google Patents

Description

  The present invention relates to an illumination device and a moving body including the illumination device.

  A headlamp such as a headlight is disposed in a front portion of a vehicle such as an automobile. The headlamp includes a housing (housing) and a lighting device attached to the housing.

  This type of vehicle lighting device (headlight) includes, for example, a light emitting element, a reflector that reflects light from the light emitting element forward, and a front of the light emitting element so that reflected light from the reflector is transmitted. (For example, refer patent document 1).

JP 2008-243433 A

  In the conventional lighting device described above, a shielding protrusion for shielding part of the reflected light from the reflector is provided in order to suppress glare on the opposite lane side. For this reason, a part of the light emitted from the light emitting element is shielded by the shielding protrusion and is not emitted forward. That is, in the conventional illumination device, the light emitted from the light emitting element is not effectively used for illumination purposes, and the illumination effect is low.

  Then, an object of this invention is to provide a moving body provided with the illuminating device which can improve a lighting effect more, and the said illuminating device.

  In order to achieve the above object, an illumination device according to an aspect of the present invention is an illumination device mounted on a moving body, and includes a light emitting element, a reflector that reflects light emitted from the light emitting element, and the reflector. A lens disposed in a light reflection direction; and a light guide provided between the reflector and the lens, the light guide having an entrance surface and an exit surface, and reflected by the reflector Of the emitted light, the light incident from the incident surface is spread with respect to the central axis of the lens and is emitted from the emission surface toward the lens.

  A moving object according to one embodiment of the present invention includes the lighting device in a front portion of a vehicle body.

  According to the present invention, the lighting effect can be further enhanced.

1 is a front view of an automobile according to an embodiment of the present invention. It is a front view of the illuminating device which concerns on embodiment of this invention. It is sectional drawing of the illuminating device which concerns on embodiment of this invention in the III-III line of FIG. It is sectional drawing of the illuminating device which concerns on embodiment of this invention in the III-III line | wire of FIG. 2, Comprising: It is a figure which shows the optical path of the light which passes a light guide part or a processus | protrusion. It is sectional drawing of the illuminating device which concerns on embodiment of this invention in the VV line | wire of FIG. 2, Comprising: It is a figure which shows the optical path of the light which passes a light guide part. It is sectional drawing of the illuminating device which concerns on embodiment of this invention in the VI-VI line of FIG. 2, Comprising: It is a figure which shows the optical path of the light which passes along a processus | protrusion. It is a figure for demonstrating the change of the advancing direction of the light by the light guide part and protrusion which concerns on embodiment of this invention.

  Below, the illuminating device and moving body which concern on embodiment of this invention are demonstrated in detail using drawing. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangements, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Hereinafter, in this specification, “front” refers to the direction in which light is emitted from the illumination device (light emission direction), the light extraction direction in which light is extracted (that is, the illumination direction), and “rear”. Is the direction opposite to “forward”. “Front” is the direction of travel when the vehicle is moving forward, the right side (right side) when the vehicle is moving forward is “right direction”, and the opposite direction (left side) is “left direction”. The side is “upper” or “upper”, and the opposite direction is “lower” or “lower”.

  The front-rear direction is the Z-axis direction, the up-down direction (vertical direction) is the Y-axis direction, and the left-right direction (horizontal direction) is the X-axis direction. That is, in the following embodiments, the predetermined illumination direction is the direction in which the illumination device illuminates, that is, “forward”, and is the positive Z-axis direction.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member. In the present specification, expressions using “substantially” such as substantially parallel are used. For example, “substantially parallel” not only means completely parallel but also means substantially parallel, for example, including an error of about several percent. The same applies to expressions using other “abbreviations”.

(Embodiment)
[Automobile]
First, an automobile 100 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a front view of an automobile 100 according to an embodiment of the present invention.

  As shown in FIG. 1, an automobile 100 according to the present embodiment is an example of a moving body such as a four-wheel automobile, and includes a vehicle body (vehicle) 110 and headlights disposed in front left and right portions of the vehicle body 110. And a lamp 120. The automobile 100 is, for example, a gasoline automobile driven by a gasoline engine or an electric automobile driven by electricity.

  The headlamp 120 is a lamp and is a headlight (vehicle headlamp) mounted on a vehicle in the present embodiment. The headlamp 120 includes a housing 121, a front cover 122, and the lighting device 1 attached to the rear of the front cover 122.

  The housing 121 is a metal housing, for example, and has an opening that emits light from the lighting device 1. The front cover 122 is a translucent headlamp cover and is provided in the opening of the housing 121. The housing 121 and the front cover 122 are sealed so that water or dust does not enter the housing 121.

  The lighting device 1 is disposed behind the front cover 122 and attached to the housing 121. The light emitted from the illumination device 1 passes through the front cover 122 and is emitted to the outside.

[Lighting device]
Next, the illuminating device 1 which concerns on this Embodiment is demonstrated using FIGS.

  FIG. 2 is a front view of the illumination device 1 according to the present embodiment. FIG. 3 is a cross-sectional view of lighting device 1 according to the present embodiment taken along line III-III in FIG. Specifically, FIG. 3 shows a vertical cross section passing through the center of the lighting device 1.

  FIG. 4 is a cross-sectional view of the illumination device 1 according to the present embodiment taken along the line III-III in FIG. 2, and is a diagram illustrating an optical path of light passing through the light guide unit 71 or the protrusion 80. FIG. 5 is a cross-sectional view of the illumination device 1 according to the present embodiment taken along the line V-V in FIG. 2, and is a diagram illustrating an optical path of light passing through the light guide unit 71. FIG. 6 is a cross-sectional view of the illumination device 1 according to the present embodiment taken along the line VI-VI in FIG. 2, and is a diagram illustrating an optical path of light passing through the protrusion 80. 5 and 6, the alternate long and short dash line drawn in the vertical direction of the drawing is the central axis of the low beam lens 30. The central axis passes through the approximate center of the lighting device 1.

  4 to 6, the arrow indicated by a thick line indicates the optical path of light passing through the light guide unit 71 or the protrusion 80 according to the present embodiment. The arrow shown with a thin broken line has shown the optical path of the light when there is no light guide part 71 or projection 80 concerning this embodiment as a comparative example.

  The illuminating device 1 which concerns on this Embodiment is an illuminating device mounted in a moving body. The illumination device 1 is a vehicle illumination device used for, for example, a vehicle headlamp, and emits light forward. That is, the front of the vehicle is the light emission direction of the lighting device 1 and the lighting direction of the lighting device 1. The illuminating device 1 is arrange | positioned in the front part of the vehicle body 110, as shown in FIG.

  As shown in FIGS. 2 and 3, the lighting device 1 includes, as a lamp body, a low beam light source module 10, a high beam light source module 20, a low beam lens 30, a high beam lens 40, a radiator 50, The reflector 60, the shield body 70, the light guide part 71, and the protrusion 80 are provided. Furthermore, the illumination device 1 includes an illumination control unit (not shown) that controls the low-beam light source module 10 and the high-beam light source module 20.

  The illumination device 1 is an integrated lamp that can irradiate a high beam that is a traveling beam and a low beam that is a passing beam. The high beam is light that irradiates the far front of the automobile 100. The low beam is light that irradiates the front lower side of the automobile 100.

  As shown in FIG. 2, the illuminating device 1 is comprised so that it may be settled in a predetermined | prescribed circular area | region when it sees from an illumination direction (Z-axis direction). More specifically, the low beam light source module 10, the high beam light source module 20, the low beam lens 30, the high beam lens 40, the radiator 50, the reflector 60, the shield body 70, and the light guide 71. The protrusions 80 are unitized so as to be within a predetermined circular area when viewed from the Z-axis direction. The predetermined circular area is, for example, φ70 mm.

  The lighting device 1 according to the present embodiment is mounted on the automobile 100 when the right side is a traveling lane (own lane) and the left side is an opposite lane with respect to the traveling direction as in the United States or the like. Device. When the lighting device 1 is mounted on an automobile in which the left side is a traveling lane and the right side is an opposite lane with respect to the traveling direction as in Japan or the like, the configuration described below is the same as the configuration of the lighting device 1. What is necessary is just to invert right and left centering on a central axis.

  Below, the detail of each structural member of the illuminating device 1 is demonstrated.

[Light source module for low beam]
The low beam light source module 10 is an example of a first light source that emits light for short-distance illumination. Specifically, the low beam light source module 10 is an LED (Light Emitting Diode) module for forming a low beam, and lights up when irradiating a front lower region of the vehicle body 110, specifically, a road surface.

  The low beam light source module 10 is turned on when the surrounding environment is dark, such as at night or in a tunnel. In the present embodiment, the low beam light source module 10 is lit not only when irradiating a low beam (during short distance illumination) but also when irradiating a high beam (during long distance illumination). That is, in the present embodiment, the high beam is formed by the light emitted from the low beam light source module 10 and the light emitted from the high beam light source module 20.

  The low-beam light source module 10 is a white light source, for example, a BY type white LED light source that emits white light using a blue LED chip that emits blue light and a yellow phosphor. Alternatively, the low beam light source module 10 may be a white LED light source that emits white light using LED chips that emit blue light, red light, and green light.

  As shown in FIG. 3, the low beam light source module 10 includes a low beam light emitting element 11 and a substrate 12 on which the low beam light emitting element 11 is mounted.

  The low beam light source module 10 may have either a SMD (Surface Mount Device) structure or a COB (Chip On Board) structure.

  In the case of the SMD structure, the low beam light emitting element 11 is, for example, an SMD type LED element having a configuration in which an LED chip (bare chip) is mounted in a resin container and sealed with a sealing member (phosphor-containing resin). . On the other hand, in the case of the COB structure, the light emitting element 11 for low beam is an LED chip (bare chip) itself, and the LED chip is directly mounted on the substrate 12. In this case, the LED chip mounted on the substrate 12 is sealed with a sealing member such as a phosphor-containing resin.

  The low beam light source module 10 is fixed to the first heat sink 51 of the radiator 50. Specifically, the substrate 12 is placed and fixed on a predetermined placement surface of the first heat sink 51. In the present embodiment, as shown in FIG. 3, in the low beam light source module 10, the substrate 12 is arranged horizontally (horizontal placement) so that light is emitted upward. That is, the optical axis of the low beam light source module 10 (low beam light emitting element 11) is parallel to the Y axis.

  The low-beam light-emitting element 11 is an example of a first light-emitting element that emits light that passes through the low-beam lens 30. The low-beam light emitting element 11 is arranged at the position of the focal point (first focal point) of the reflector 60. The low beam light emitting element 11 is thermally coupled to the first heat sink 51.

  The substrate 12 is, for example, a ceramic substrate made of ceramics such as alumina, a resin substrate made of resin, or a metal base substrate that is insulation-coated with a metal as a base. Moreover, the planar view shape of the board | substrate 12 can be made into the shape according to the shape of the mounting surface of the heat radiator 50 in which the board | substrate 12 is mounted.

[High beam light source module]
The high beam light source module 20 is an example of a second light source that emits light for long-distance illumination. Specifically, the high beam light source module 20 is an LED module for forming a high beam, and lights up when irradiating a far region (including a region above the horizontal plane) in front of the vehicle body 110.

  The high beam light source module 20 is turned on when the surrounding environment is dark at night or in a tunnel, and there is no oncoming vehicle in the oncoming lane. Specifically, the high beam light source module 20 is turned on when a high beam is irradiated.

  The high beam light source module 20 is a white light source, for example, a BY type white LED light source that emits white light using a blue LED chip that emits blue light and a yellow phosphor. Alternatively, the high beam light source module 20 may be a white LED light source that emits white light using LED chips that emit blue light, red light, and green light.

  The high beam light source module 20 may have either an SMD structure or a COB structure. The details of the SMD structure and the COB structure are the same as those of the low beam light source module 10.

  As shown in FIGS. 2 and 3, the high beam light source module 20 includes high beam light emitting elements 21 to 23 and a substrate 24 on which the high beam light emitting elements 21 to 23 are mounted.

  The high beam light source module 20 is fixed to the second heat sink 52. Specifically, the substrate 24 is mounted and fixed on a predetermined mounting surface of the second heat sink 52. In the present embodiment, as shown in FIG. 3, in the high beam light source module 20, the substrate 24 is disposed vertically (vertically) so that light is emitted forward. That is, the optical axis of the high beam light source module 20 (high beam light emitting elements 21 to 23) is parallel to the Z axis.

  The high beam light emitting elements 21 to 23 are examples of second light emitting elements that emit light that passes through the high beam lens 40. The high-beam light emitting elements 21 to 23 may emit the same color and the same amount of light, or may emit different colors and different amounts of light.

  The high beam light emitting elements 21 to 23 are arranged in the illumination direction from the low beam light emitting element 11. In other words, the high-beam light emitting elements 21 to 23 are arranged in front of the low-beam light emitting element 11 (Z-axis positive direction). The high beam light emitting elements 21 to 23 are thermally coupled to the second heat sink 52 of the radiator 50.

  The high beam light emitting element 21 emits light that passes through the collimating lens 41 of the high beam lens 40. The high beam light emitting element 22 emits light that passes through the collimating lens 42 of the high beam lens 40. The high beam light emitting element 23 emits light that passes through the collimating lens 43 of the high beam lens 40. Moreover, the light emitted from each of the collimating lenses 41 to 43 may irradiate the same region as each other, or may irradiate different regions.

  The substrate 24 is, for example, a ceramic substrate made of ceramics such as alumina, a resin substrate made of resin, or a metal base substrate that is insulation-coated with a metal as a base. Moreover, the planar view shape of the board | substrate 24 can be made into the shape according to the shape of the mounting surface of the heat radiator 50 in which the board | substrate 24 is mounted. For example, as illustrated in FIG. 2, the planar view shape of the substrate 24 is an arc shape having a predetermined width.

[Low beam lens]
The low beam lens 30 is an example of a first lens that is disposed in the direction of light reflection by the reflector 60 and emits the light reflected by the reflector 60 in a predetermined illumination direction. Specifically, the low beam lens 30 is a projection lens that passes the light emitted from the low beam light source module 10 and emits the light forward.

  As shown in FIG. 4, the light emitted from the low beam light source module 10 is reflected by the reflector 60, then enters from the entrance surface of the low beam lens 30, passes through the low beam lens 30, and exits from the exit surface. Is done. The incident surface is a flat surface behind the low beam lens 30, and the output surface is a curved surface (for example, a spherical surface or an elliptic spherical surface) in front of the low beam lens 30.

  In the present embodiment, the low beam lens 30 is disposed in front of the low beam light source module 10 and the shield body 70 (in the positive Z-axis direction). The low beam lens 30 is disposed in front of the high beam lens 40. Specifically, the low beam lens 30 is disposed so that the incident surface of the low beam lens 30 and the exit surface (front main surface) of the high beam lens 40 are substantially flush with each other. The low beam lens 30 is positioned by being fixed to the shield body 70 (or the first heat sink 51), for example.

  The low beam lens 30 projects the light source image formed on the focus plane F onto the front virtual vertical screen as a reverse image. That is, the low beam lens 30 reversely projects a light source image (light distribution) formed on the focus surface F, which is light emitted from the low beam light emitting element 11. Note that the focus surface F is a surface including the rear focal point of the low beam lens 30, and specifically, is a focus surface on the reflector 60 side. The focus plane F is located near the focal point (second focal point) of the reflector 60, for example.

  The low beam lens 30 can be produced by, for example, injection molding using a transparent resin such as acrylic (PMMA), polycarbonate (PC), or cyclic olefin resin. For example, the low beam lens 30 is a part of a sphere or an elliptical sphere. Specifically, the low beam lens 30 has a shape (1/4 sphere) in which the lower portion is cut into a sphere, and the upper portion is formed from the 1/4 sphere to the high beam lens 40 (three collimating lenses 41). To 43) with the front portion removed.

[High beam lens]
The high beam lens 40 is a projection lens that passes and emits the light emitted from the high beam light source module 20. The high beam lens 40 is an example of a second lens arranged in the light emitting direction (Z-axis positive direction) of the high beam light emitting elements 21 to 23.

  Specifically, the high beam lens 40 is formed by combining three collimating lenses 41 to 43. The three collimating lenses 41 to 43 correspond one-to-one to the high beam light emitting elements 21 to 23, respectively. The three collimating lenses 41 to 43 convert incident light into parallel light.

  Each of the three collimating lenses 41 to 43 has a truncated cone shape whose diameter increases toward the front. High beam light emitting elements 21 to 23 are arranged on the small diameter side.

  The high beam lens 40 can be manufactured, for example, by injection molding using a transparent resin such as acrylic (PMMA), polycarbonate (PC), or cyclic olefin resin.

  In the present embodiment, the low beam lens 30 and the high beam lens 40 are formed separately, but may be formed integrally. Moreover, although the three collimating lenses 41 to 43 are integrally formed, they may be formed separately. The arrangement of the three collimating lenses 41 to 43, that is, the arrangement of the three high beam light emitting elements 21 to 23 is not limited to the illustrated example.

[Heat radiator]
The radiator 50 is a heat radiating member for radiating heat generated in the low beam light source module 10 and the high beam light source module 20 to the outside (in the atmosphere). Therefore, it is preferable to form the radiator 50 using a material having high thermal conductivity such as metal. The radiator 50 is made of, for example, an aluminum die casting using an aluminum alloy.

  As shown in FIG. 3, the heat radiating body 50 is divided into two parts, a first heat sink 51 and a second heat sink 52. That is, the radiator 50 is integrated by combining the first heat sink 51 and the second heat sink 52. Each of the first heat sink 51 and the second heat sink 52 is provided with a plurality of heat radiation fins.

  The first heat sink 51 is a first heat radiator that is thermally coupled to the low-beam light emitting element 11. The first heat sink 51 is a heat radiating component for radiating heat generated mainly by the low beam light source module 10 (low beam light emitting element 11). The first heat sink 51 is provided with a placement surface (installation surface) on which the low beam light source module 10 is placed.

  The second heat sink 52 is a second radiator that is thermally coupled to the high-beam light emitting elements 21 to 23. The second heat sink 52 is a heat radiating component for radiating heat generated mainly by the high beam light source module 20 (high beam light emitting elements 21 to 23). The second heat sink 52 is provided with a placement surface (installation surface) on which the high beam light source module 20 is placed.

  The second heat sink 52 is disposed so as to sandwich the reflector 60 between the second heat sink 52 and the first heat sink 51. In the present embodiment, as shown in FIG. 3, a space in which the low beam light source module 10, the reflector 60, the light guide 71, and the protrusion 80 are provided is formed between the first heat sink 51 and the second heat sink 52. Has been.

[Reflector]
The reflector 60 reflects light emitted from the low-beam light emitting element 11. The reflector 60 is disposed inside the radiator 50 and above the low-beam light source module 10. The reflector 60 has a light reflecting surface (curved reflecting surface) that reflects light emitted upward from the low beam light source module 10 obliquely downward and incident on the low beam lens 30.

  In the present embodiment, the light reflection surface of the reflector 60 (the surface on the low-beam light emitting element 11 side) includes a part of the spheroid. For example, in the vertical cross section of the illumination device 1 (the cross section shown in FIG. 3), the reflector 60 has a shape that connects a plurality of ellipses having different focal positions. One of the focal points of each of the ellipses (the first focal point of the reflector 60) is located in the vicinity of the low-beam light emitting element 11. The other focal point of each of the ellipses (the second focal point of the reflector 60) is positioned in the vicinity of the focus surface F of the low beam lens 30. For example, the direction of the axis (long axis) in the substantially elliptical shape of the reflector 60 is a direction connecting the low-beam light emitting element 11 and the edge (upper surface end) of the shield body 70 on the focus surface F of the low-beam lens 30.

  The reflector 60 is fixed to the first heat sink 51 of the radiator 50 so that the low-beam light emitting element 11 is disposed in the vicinity of the first focal point. Thereby, the light emitted from the low-beam light emitting element 11 is reflected by the reflector 60 and travels toward the vicinity of the second focal point.

  The reflector 60 is formed by, for example, resin molding using a heat-resistant resin, and a reflective film is formed on the surface thereof. For example, polycarbonate (PC) or the like can be used as the heat resistant resin. Alternatively, fiber reinforced plastic (FRP (Fiber Reinforced Plastic) or BMC (Bulk Molding Compound)) may be used instead of the heat resistant resin. The reflective film is, for example, a metal vapor deposition film such as an aluminum vapor deposition film. The reflection film specularly reflects light emitted from the low-beam light emitting element 11.

[Shield body]
The shield body 70 is an example of a shielding member that blocks a part of the light reflected by the reflector 60. Specifically, the shield body 70 is a structure for forming a cut-off line that is a predetermined light / dark boundary by blocking a part of the light emitted from the low-beam light source module 10.

  The shield body 70 is provided between the reflector 60 and the low beam lens 30. Specifically, the shield body 70 is fixed to the first heat sink 51.

  The shield body 70 is formed using, for example, a heat resistant resin or a fiber reinforced plastic, similarly to the reflector 60. A reflective film is formed on the surface of the shield body 70 on the low beam lens 30 side. The reflective film is, for example, an aluminum vapor deposition film.

[Light guide unit 71]
The light guide unit 71 is a part of the shield body 70 and is provided between the reflector 60 and the low beam lens 30.

  As shown in FIGS. 3 to 5, the light guide unit 71 includes an incident surface 72, an output surface 73, a top surface 74, and a bottom surface 75. The light guide unit 71 spreads the light incident from the incident surface 72 out of the light reflected by the reflector 60 with respect to the central axis, and emits the light from the output surface 73 toward the low beam lens 30. Specifically, the light guide unit 71 spreads the light incident from the incident surface 72 to the traveling lane side and travels so as to irradiate the region above the horizontal line.

  As shown in FIG. 5, the incident surface 72 has a surface that is concavely curved in the direction opposite to the reflector 60. For example, the incident surface 72 includes a part of a spheroid.

  The incident surface 72 is provided at a position shifted from the central axis in a top view. The direction and amount (distance) of deviation from the central axis of the incident surface 72 are, for example, substantially the same as the direction and amount (distance) of deviation of the protrusion 80 from the central axis of the incident surface 81. In the present embodiment, the incident surface 72 is shifted from the central axis to the traveling lane side (right side).

  As shown in FIG. 5, the emission surface 73 has a surface curved concavely toward the reflector 60. For example, the emission surface 73 includes a part of a spheroid.

  The emission surface 73 is provided so as to pass through the central axis in a top view. Specifically, as shown in FIG. 5, the emission surface 73 is provided such that the center in top view passes through the central axis.

  The top surface 74 is an upper surface between the entrance surface 72 and the exit surface 73 of the light guide 71. Specifically, the top surface 74 is a surface on the second heat sink 52 side. A reflective film is formed on the top surface 74 of the light guide 71. Thereby, it can suppress that light injects from the top | upper surface 74. FIG.

  The bottom surface 75 is a lower surface between the entrance surface 72 and the exit surface 73 of the light guide unit 71. Specifically, the bottom surface 75 is a surface on the first heat sink 51 side. A reflective film is formed on the bottom surface 75 of the light guide unit 71.

  The light guide unit 71 is formed integrally with the shield body 70. Specifically, when the reflective film is formed on the surface of the molded heat-resistant resin or fiber reinforced plastic, the light guide portion 71 is formed by not forming the reflective film on the incident surface 72 and the emission surface 73. Can do. The protrusion 80 can be formed in the same manner. The reflective film is, for example, an aluminum vapor deposition film.

[Protrusions (light guide member)]
The protrusion 80 is a translucent protrusion that protrudes upward from the top surface 74 of the light guide portion 71. Specifically, the protrusion 80 protrudes above the optical axis of the low beam lens 30. In FIG. 3, the optical axis of the low beam lens 30 is a direction connecting the central axis on the incident surface of the low beam lens 30 and the edge (upper surface end) of the shield body 70 on the focus surface F of the low beam lens 30. is there.

  As shown in FIG. 3, the protrusion 80 is disposed between the focus surface F of the low beam lens 30 and the reflector 60. Specifically, the protrusion 80 is arranged between the position of the second focal point of the reflector 60 and the reflector 60.

  As shown in FIG. 6, the protrusion 80 is disposed at a position shifted from the central axis of the low beam lens 30. In the present embodiment, the protrusion 80 is arranged so as to be shifted from the central axis to the travel lane side (right side).

  As shown in FIGS. 4 and 6, the protrusion 80 has an entrance surface 81 and an exit surface 82. The protrusion 80 emits light incident from the incident surface 81 out of the light reflected by the reflector 60 from the emission surface 82 toward the low beam lens 30 while changing the traveling direction of the light. Specifically, the protrusion 80 changes the traveling direction of the light incident from the incident surface 81 so that the light is irradiated to the traveling lane side. Further, the protrusion 80 changes the traveling direction of the light incident from the incident surface 81 so that the light irradiates farther away.

  As shown in FIGS. 4 and 6, the incident surface 81 has a surface curved convexly toward the reflector 60. As shown in FIGS. 4 and 6, the emission surface 82 has a surface that is concavely curved toward the reflector 60. The entrance surface 81 and the exit surface 82 include, for example, a part of a spheroid.

  For example, the entrance surface 81 and the exit surface 82 are inclined with respect to the vertical direction (Z-axis direction) as shown in FIG. Specifically, the entrance surface 81 and the exit surface 82 are inclined so that the upper end is positioned in front of the lower end (the connection portion with the top surface of the shield body 70). That is, the protrusion 80 protrudes obliquely upward and forward from the top surface of the shield body 70.

  As shown in FIG. 6, the protrusion 80 has a side surface 83 and a side surface 84. The side surface 83 and the side surface 84 are side surfaces between the entrance surface 81 and the exit surface 82, and are provided in parallel to the optical axis of the low beam light emitting element 11. Specifically, the side surface 83 and the side surface 84 are planes parallel to the Y-axis direction. That is, the side surface 83 and the side surface 84 are orthogonal to the top surface of the shield body 70. For example, the side surface 83 and the side surface 84 are elliptical arc-shaped or arc-shaped surfaces having a predetermined width.

  As shown in FIG. 6, the side surface 83 and the side surface 84 are inclined with respect to the central axis. Specifically, the side surface 83 and the side surface 84 are inclined so that the rear end (end portion on the incident surface 81 side) is farther from the central axis than the front end (end portion on the emission surface 82 side). The side surface 83 and the side surface 84 are substantially flush with a part of the side surface of the light guide portion 71 (the portion on the incident surface 72 side).

  The protrusion 80 is formed from a translucent resin material. In the present embodiment, the protrusion 80 is formed integrally with the shield body 70. Therefore, the material of the protrusion 80 is the same as that of the shield body 70, and is, for example, a heat resistant resin or a fiber reinforced plastic.

  As described above, the shield body 70 has a reflective film formed on the surface, but the projection 80 has no reflective film formed thereon. Specifically, no reflecting film is formed on the incident surface 81. A reflection film is not formed on the emission surface 82.

[Light passing through the light guide]
Subsequently, an optical path of light passing through the light guide unit 71 according to the present embodiment will be described with reference to FIGS. 4 and 5.

  The light emitted upward from the low-beam light emitting element 11 is reflected by the reflector 60 and travels forward. As shown in FIGS. 4 and 5, a part of the light reflected by the reflector 60 (arrow with a thin broken line) enters the light guide 71 from the incident surface 72 of the light guide 71. The light incident on the light guide portion 71 travels in the light guide portion 71, exits from the exit surface 73, and travels toward the low beam lens 30.

  At this time, the light is refracted by the difference in refractive index between the light guide unit 71 and its surroundings (air). For example, the refractive index of the light guide 71 is about 1.48 to 1.60. Moreover, in the light guide part 71, as shown in FIG. Thereby, as shown in FIG. 4, the light radiate | emitted from the output surface 73 of the light guide part 71 advances toward upper direction. That is, the light guide 71 emits the light incident from the incident surface 72 from the emission surface 73 while changing the traveling direction of the light upward. In the example shown in FIG. 4, an example is shown in which light is reflected only by the bottom surface 75, but part of the incident light is also reflected by the top surface 74.

  As a result, as shown in FIG. 4, the light (thick solid line) emitted from the emission surface 73 of the light guide 71 passes through the low beam lens 30 and then travels substantially parallel to the central axis above the central axis. To do. That is, the light emitted from the emission surface 73 of the light guide 71 irradiates above the horizontal plane.

  Further, as shown in FIG. 5, the light emitted from the emission surface 73 of the light guide portion 71 travels more widely with respect to the central axis than when there is no light guide portion 71. Specifically, on the focus surface F of the low beam lens 30, the light transmitted through the light guide 71 (thick solid line) spreads with respect to the central axis more than the light without the light guide 71 (thin broken line). ing. Therefore, since the low beam lens 30 reversely projects the distribution of light passing through the focus plane F, the spread light is irradiated in front of the low beam lens 30.

  FIG. 7 is a diagram for explaining a change in the traveling direction of light by the light guide unit 71 and the protrusion 80 according to the present embodiment. In FIG. 7, an area shaded with dots is an area irradiated with light (low beam) emitted from the low beam lens 30.

  As described above, the light guide unit 71 changes the traveling direction so that the light that irradiates the oncoming lane side when there is no light guide unit 71 is irradiated above the horizontal line and with a wider irradiation range. be able to. That is, as illustrated in FIG. 7, the light guide unit 71 can irradiate the region 91 brightly, for example, instead of suppressing the brightness of the region 90. Thereby, for example, a signboard provided above the road can be irradiated, and a more comfortable driving environment for the driver can be realized.

[Light passing through protrusions]
Subsequently, an optical path of light passing through the protrusion 80 according to the present embodiment will be described with reference to FIGS. 4 and 6.

  As shown in FIGS. 4 and 6, a part of the light reflected by the reflector 60 (arrow with a thin broken line) enters the protrusion 80 from the incident surface 81 of the protrusion 80. The light incident on the protrusion 80 travels in the protrusion 80, is emitted from the exit surface 82, and travels toward the low beam lens 30.

  At this time, the light is refracted by the difference in refractive index between the protrusion 80 and its surroundings (air). For example, the refractive index of the protrusion 80 is the same as that of the light guide 71 and is about 1.48 to 1.60. Thereby, as shown in FIG. 4, the light emitted from the emission surface 82 of the protrusion 80 travels downward as compared with the case where there is no protrusion 80. That is, the protrusion 80 emits the light incident from the incident surface 81 from the output surface 82 while changing the traveling direction of the light downward.

  Therefore, on the focus surface F of the low beam lens 30, the light transmitted through the protrusion 80 (thick broken line) travels below the light when there is no protrusion 80 (thin broken line). Since the low beam lens 30 reversely projects the distribution of light passing through the focus plane F, light passing below a predetermined line on the focus plane F passes above the line in front of the low beam lens 30.

  Specifically, as shown in FIG. 4, the light emitted from the emission surface 82 passes through the low beam lens 30 in a side view and then travels substantially parallel below the central axis. At this time, the light emitted from the emission surface 82 (thick broken line) is emitted in a direction closer to the central axis than the light without the projection 80 (thin broken line), that is, in a direction closer to the horizontal. Therefore, the light transmitted through the protrusion 80 according to the present embodiment can illuminate farther than the light without the protrusion 80. As described above, according to the present embodiment, by refracting the light by the protrusion 80, the light that has been irradiated near the vehicle body 110 can be further advanced. Therefore, the lighting effect can be enhanced.

  Note that light traveling downward as in the case where there is no protrusion 80 (thin broken line) illuminates the vicinity of the automobile 100. At this time, if the vicinity of the automobile 100 becomes too bright, the driver feels the distance or side of the automobile 100 dark. In contrast, according to the present embodiment, the projection 80 can cause the light that has been irradiated near the automobile 100 to travel further away. As a result, a more comfortable driving environment can be realized for the driver, which can contribute to safe driving.

  Further, as shown in FIG. 6, the light emitted from the emission surface 82 of the protrusion 80 travels on the opposite lane side as compared with the case where the protrusion 80 is not provided. That is, the projection 80 emits the light incident from the incident surface 81 from the exit surface 82 by changing the traveling direction of the light to the opposite lane side (left side). Specifically, on the focus surface F of the low beam lens 30, the light transmitted through the protrusion 80 (thick broken line) travels on the opposite lane side (left side) than the light without the protrusion 80 (thin broken line).

  As shown in FIG. 6, the light emitted from the emission surface 82 travels through the low beam lens 30 and then crosses the central axis when viewed from above. That is, the light emitted from the emission surface 82 is emitted toward the traveling lane side.

  As described above, according to the present embodiment, by refracting the light by the protrusion 80, the light that has been irradiated to the opposite lane side can be advanced to the traveling lane (own lane) side. Specifically, the protrusion 80 changes the traveling direction so that light that irradiates the opposite lane side when the protrusion 80 is not present is irradiated to the traveling lane side and far away. That is, as illustrated in FIG. 7, the protrusion 80 changes, for example, the traveling direction of light that irradiates the region 90 so that the light irradiates the region 92. Thereby, instead of suppressing the brightness of the area 90, the area 92 can be illuminated brightly.

[Effects, etc.]
As described above, the lighting device 1 according to the present embodiment is a lighting device mounted on the automobile 100, and the low-beam light-emitting element 11, the reflector 60 that reflects the light emitted from the low-beam light-emitting element 11, and A low beam lens 30 disposed in a direction in which light is reflected by the reflector 60, and a light guide 71 provided between the reflector 60 and the low beam lens 30, the light guide 71 includes an incident surface 72 and an output. Out of the light reflected by the reflector 60, the light incident from the incident surface 72 is spread with respect to the central axis of the low beam lens 30 and is emitted from the emission surface 73 toward the low beam lens 30. To do. In addition, for example, the automobile 100 according to the present embodiment includes the lighting device 1 in the front portion of the vehicle body 110.

  Thereby, the light guide part 71 can change the advancing direction so that the light which irradiates the opposite lane side when there is no light guide part 71 is irradiated above the horizontal line and the irradiation range is expanded. it can. Thereby, since light can be used effectively, the illumination effect can be enhanced. In addition, for example, a signboard or the like provided above the road can be irradiated, and a more comfortable driving environment for the driver can be realized.

  For example, a reflective film is formed on the bottom surface 75 between the incident surface 72 and the emission surface 73 of the light guide 71.

  For example, a reflective film is formed on the top surface 74 between the incident surface 72 and the emission surface 73 of the light guide 71.

  Thereby, it is possible to prevent light from entering the light guide portion 71 from the top surface 74. Further, it is possible to suppress the light traveling through the light guide unit 71 from being emitted from the top surface 74. Further, by causing reflection between the top surface 74 and the bottom surface 75, light can be emitted from the emission surface 73 in a direction close to the horizontal direction.

  Further, for example, the incident surface 72 has a surface that is concavely curved in the direction opposite to the reflector 60, and the output surface 73 has a surface that is concavely curved toward the reflector 60.

  Thereby, the traveling direction of light can be changed using the difference in refractive index between the light guide portion 71 and its surroundings (air), and the light can be spread.

  Further, for example, the incident surface 72 is provided at a position shifted from the central axis of the low beam lens 30 in the top view, and the emission surface 73 is provided so as to pass through the central axis of the low beam lens 30 in the top view. ing.

  Thereby, for example (when there is no light guide part 71), since the light which goes to the opposite lane side can be spread, the illumination effect can be heightened.

  In addition, for example, the lighting device 1 further includes a translucent protrusion 80 protruding upward from the top surface 74 of the light guide 71. Further, for example, the protrusion 80 protrudes upward from a portion of the top surface 74 of the light guide portion 71 where no reflective film is formed.

  Thereby, for example, the translucent protrusion 80 can lighten the traveling lane side by changing the traveling direction of the light originally toward the opposite lane to the traveling line (own lane). . Therefore, since the light can be used effectively, the illumination effect can be enhanced.

  Further, for example, the light emitted from the emission surface 73 passes through the low beam lens 30 in a side view and then travels substantially parallel to the central axis above the central axis.

  Thereby, since it can irradiate above a horizontal surface, for example, the signboard etc. which were installed on the road shoulder or the upper part can be irradiated. Therefore, a more comfortable driving environment can be realized for the driver.

  For example, the light guide part 71 is formed from a translucent resin material.

  Thereby, the light guide part 71 can be easily formed by using a resin material.

  Further, for example, the low-beam light emitting element 11 is an LED.

  Thereby, power consumption can be reduced by using LED.

(Other)
As mentioned above, although the illuminating device which concerns on this invention was demonstrated based on the said embodiment and its modification, this invention is not limited to said embodiment.

  For example, in the above embodiment, the example in which the reflective film is provided on the top surface 74 and the bottom surface 75 of the light guide unit 71 has been described, but the reflective film may not be provided on the top surface 74 and the bottom surface 75. . Even in this case, the light traveling through the light guide unit 71 travels while being reflected by the top surface 74 and the bottom surface 75 due to the difference in refractive index between the light guide unit 71 and its periphery.

  Further, for example, in the above-described embodiment, an example in which the protrusion 80 is formed integrally with the light guide unit 71 is described, but the present invention is not limited thereto. The protrusion 80 may be formed separately from the light guide portion 71 (or the shield body 70). Further, the lighting device 1 may not include the protrusion 80.

  For example, the shape and arrangement of the light guide 71 and the protrusions 80 are not limited to the above-described example. For example, the protrusion 80 may be disposed on the low beam lens 30 side with respect to the focus surface F.

  Further, for example, in the above-described embodiment, an example in which the lighting device 1 includes the plurality of high-beam light emitting elements 21 to 23 has been described, but only one high-beam light-emitting element may be provided.

  Further, for example, in the above-described embodiment, the example in which the automobile 100 includes the two lighting devices 1 (the headlamps 120) has been described, but the present invention is not limited thereto. For example, the automobile 100 may include three or more lighting devices 1 such as two lighting devices 1 on the left and right of the vehicle body 110, or may include only one lighting device 1.

  Further, for example, in the above-described embodiment, an example of application to a headlamp that irradiates a low beam and a high beam has been described, but the present invention may be applied to a fog lamp or a DRL (Daytime Running Light) headlamp.

  Further, for example, in the above embodiment, an LED is illustrated as an example of a light emitting element, but a laser element such as a semiconductor laser, a light emitting element such as an organic EL (Electro-Luminescence), or an inorganic EL element may be used.

  For example, in the above-described embodiment, a four-wheeled vehicle is illustrated as the vehicle 100, but other vehicles such as a two-wheeled vehicle may be used.

  In addition, the embodiment can be realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Illumination device 11 Low beam light emitting element (light emitting element)
30 Low beam lens
60 reflector 71 light guide 72 entrance surface 73 exit surface 74 top surface 75 bottom surface 80 protrusion 100 automobile (moving body)
110 body

Claims (11)

A lighting device mounted on a moving body,
A light emitting element;
A reflector that reflects light emitted by the light emitting element;
A lens arranged in the direction of reflection of the light by the reflector;
A light guide provided between the reflector and the lens;
The light guide unit has an entrance surface and an exit surface, out of the light reflected by the reflector, the light incident from the entrance surface is spread with respect to the central axis of the lens, and the light exits from the exit surface. Lighting device that emits light toward the lens. The lighting device according to claim 1, wherein a reflective film is formed on a bottom surface between the incident surface and the emission surface of the light guide unit. The illumination device according to claim 1, wherein a reflective film is formed on a top surface between the incident surface and the emission surface of the light guide unit. The incident surface has a concavely curved surface in a direction opposite to the reflector;
The lighting device according to claim 1, wherein the emission surface has a surface that is concavely curved toward the reflector. The incident surface is provided at a position shifted from the central axis of the lens in a top view,
The lighting device according to claim 4, wherein the emission surface is provided so as to pass through a central axis of the lens in a top view. The illuminating device according to claim 1, wherein the illuminating device further includes a translucent protrusion protruding upward from a top surface of the light guide unit. The illuminating device according to claim 3, further comprising a translucent protrusion that protrudes upward from a portion of the top surface of the light guide portion where the reflective film is not formed. The light emitted from the emission surface, after passing through the lens in a side view, travels above the central axis of the lens substantially parallel to the central axis. Lighting device. The lighting device according to any one of claims 1 to 8, wherein the light guide section is formed from a translucent resin material. The lighting device according to any one of claims 1 to 9, wherein the light emitting element is an LED (Light Emitting Diode) or a laser element.   A moving body comprising the lighting device according to claim 1 at a front portion of a vehicle body.

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