WO2020115887A1 - Élément optique, unité de phare de véhicule dans laquelle ledit élément optique est utilisé, et dispositif de phare de véhicule - Google Patents

Élément optique, unité de phare de véhicule dans laquelle ledit élément optique est utilisé, et dispositif de phare de véhicule Download PDF

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Publication number
WO2020115887A1
WO2020115887A1 PCT/JP2018/045040 JP2018045040W WO2020115887A1 WO 2020115887 A1 WO2020115887 A1 WO 2020115887A1 JP 2018045040 W JP2018045040 W JP 2018045040W WO 2020115887 A1 WO2020115887 A1 WO 2020115887A1
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WIPO (PCT)
Prior art keywords
rods
optical element
light
rod
vehicle
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PCT/JP2018/045040
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English (en)
Japanese (ja)
Inventor
太田　光彦
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マクセル情映テック株式会社
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Application filed by マクセル情映テック株式会社 filed Critical マクセル情映テック株式会社
Priority to JP2020558773A priority Critical patent/JP7152511B2/ja
Priority to PCT/JP2018/045040 priority patent/WO2020115887A1/fr
Publication of WO2020115887A1 publication Critical patent/WO2020115887A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides

Definitions

  • the present invention relates to an optical element, a vehicle headlight unit using the optical element, and a vehicle headlight device.
  • the headlight includes a headlight for passing (hereinafter, referred to as a low beam) and a headlight for traveling (hereinafter, referred to as a high beam), which share the irradiation range. It is difficult to secure sufficient visibility by lighting only the low beam, but on the other hand, lighting the high beam in addition to the low beam may dazzle the driver of an oncoming vehicle or a preceding vehicle.
  • the headlamp unit includes a plurality of light emitting elements, an optical element, and a projection lens.
  • the optical element is composed of a plurality of rods corresponding to each light emitting element and an integrated portion that connects the rods, and each rod has an incident surface on which light emitted from the light emitting element is incident and an integrated portion side facing the incident surface. Is provided with an emission surface. The light emitted from each light emitting element enters from the incident surface of each rod of the optical element, propagates in the optical element, exits from the output surface, and enters the projection lens.
  • the light that has entered the projection lens is projected in front of the vehicle by the projection lens and becomes a high beam light distribution.
  • each light emitting element is turned on and off, and each area of the corresponding light distribution is illuminated or not illuminated.
  • the additional components for realizing the low beam are a plurality of light emitting elements for the low beam and an optical element for the low beam.
  • the projection lens is also used as a projection lens that realizes a high beam.
  • the low beam optical element is composed of a plurality of rods corresponding to each light emitting element and an integrated portion that connects the rods, and the light emitted from the light emitting element is incident on each rod.
  • An entrance surface is provided, and an exit surface is provided on the integrated portion side facing the entrance surface.
  • the light emitted from each light emitting element for low beam enters from the incident surface of each rod of the optical element for low beam, propagates in the optical element for low beam, exits from the emitting surface, and enters the projection lens.
  • the light incident on the projection lens is projected in front of the vehicle by the projection lens and becomes a low beam light distribution.
  • the configuration and the operation for realizing the low beam are the same as the configuration and the operation for realizing the high beam, and the only major difference is that the light emitting elements for performing the ADB are not turned on and off. ..
  • Patent Document 1 discloses a vehicle headlamp device, which includes a plurality of light emitting elements for high beam, an optical element for high beam, a plurality of light emitting elements for low beam, an optical element for low beam, and a projection lens.
  • the optical element for low beam includes a plurality of light guide portions that propagate light from a plurality of light emitting elements, and a light mixing portion in which the light guide portions are integrally formed.
  • Patent Document 1 it is possible to provide a vehicular headlamp device that can reduce unevenness in brightness and unevenness in color of a light emitting element and form a smooth light distribution.
  • a vehicular headlamp device that can reduce unevenness in brightness and unevenness in color of a light emitting element and form a smooth light distribution.
  • Is not considered to secure the peak value of the luminous intensity necessary for in order to secure the peak value of the luminous intensity necessary in the vicinity of the horizontal center of the light distribution in the present invention, for example, It is conceivable to increase the output of the light emitting element that forms the vicinity of the center of the light distribution after appropriately limiting the value, but there is a problem that the output has an upper limit and the energy efficiency is poor.
  • the present invention has been made in view of the above-mentioned problems of the prior art, and an optical element capable of forming a luminous intensity peak of light distribution with high energy efficiency, and a vehicle headlamp using the same.
  • a unit and a vehicle headlight device are provided.
  • the present invention is an optical element used in a vehicle headlight device, wherein the optical element comprises a plurality of rods for propagating light emitted from a plurality of light emitting elements, and a plurality of rods. It has an integrated part that connects and connects, and among the multiple rods, the rod whose irradiation light contributes most to the luminous intensity peak formation of the light distribution has a lower directivity than other rods, and from the connection part of the integrated part It is configured such that the thickness of the integrated portion in the outgoing light direction is thinner than that of other rods.
  • the optical element which can raise energy efficiency and can form the luminous intensity peak of light distribution, the vehicle headlamp unit using the same, and the vehicle headlamp apparatus are provided. You can
  • FIG. 3B is a diagram showing the luminous intensity along the horizontal direction in the vicinity of the vertical direction minus 1° in FIG. 3A.
  • FIG. 5 is an image showing a two-dimensional illuminance distribution on the emission surface of the optical element of FIG. 4.
  • FIG. 5 is a graph showing an illuminance distribution along the horizontal direction near the center in the vertical direction on the emission surface of the optical element of FIG. 4. It is a top view which shows another example of a structure of the conventional optical element for low beams, and each light emitting element.
  • 7 is an image showing a two-dimensional illuminance distribution on the emission surface of the optical element of FIG. 6.
  • 7 is a graph showing an illuminance distribution along the horizontal direction near the center in the vertical direction on the emission surface of the optical element of FIG. 6.
  • movement of only one rod in FIG. 9 is an image showing a two-dimensional illuminance distribution on the emission surface of the optical element of FIG. 8.
  • FIG. 9 is a graph showing an illuminance distribution along the horizontal direction near the center in the vertical direction on the emission surface of the optical element of FIG. 8. It is a figure showing the reflection state of the light ray inside a rod. It is a figure which shows the simulation result of the taper of a rod, and the relationship of directivity. It is a figure for demonstrating operation
  • 13 is an image showing a two-dimensional illuminance distribution on the emission surface of the optical element of FIG. 12.
  • 13 is a graph showing an illuminance distribution along the horizontal direction near the center in the vertical direction on the emission surface of the optical element of FIG. 12. It is a figure which shows the structure which reduced the thickness of the integrated part in FIG.
  • FIG. 15 is a graph showing an illuminance distribution along the horizontal direction near the center in the vertical direction on the emission surface of the optical element of FIG. 14. It is a figure for explaining the principle that the light uptake rate of the projection lens does not decrease even if the directivity of the rod forming the central portion of the light distribution is set lower than that of the other rods.
  • FIG. 3 is a plan view showing a configuration example of a low beam optical element and each light emitting element in an example.
  • It is an image showing the two-dimensional illuminance distribution on the exit surface of the optical element of FIG. 18 is a graph showing an illuminance component along the horizontal direction near the center in the vertical direction on the emission surface of the optical element of FIG. 17.
  • FIG. 1 is a schematic cross-sectional view illustrating the internal structure of the vehicle headlight device according to this embodiment.
  • the vehicle headlamp device according to the present embodiment is arranged on the left and right sides in the vehicle width direction in front of the vehicle, but has substantially the same configuration except that it has a bilaterally symmetrical structure. Therefore, the structure of the vehicle headlamp device on one side will be described below.
  • the vehicle headlight device 100 includes a lamp body 212 and a translucent cover 214.
  • the lamp body 212 has an opening in the front direction of the vehicle, and has a detachable cover 212a on the rear side that is detached when the light emitting element is replaced.
  • a light cover 214 is connected to the front opening of the lamp body 212 to form a lamp chamber 216.
  • a headlamp unit 9 that radiates light toward the front of the vehicle is housed in the lamp chamber 216.
  • a lamp bracket 218 having a pivot mechanism 218a that serves as a swing center of the headlight unit 9 is formed in a part of the headlight unit 9.
  • the lamp bracket 218 is screwed with an aiming adjustment screw 220 rotatably supported on the wall surface of the lamp body 212. Therefore, the headlight unit 9 is supported in a tiltable state at a predetermined position in the lamp chamber 216 determined by the adjustment state of the aiming adjustment screw 220.
  • a swivel actuator 311 for configuring a curved road light distribution variable headlight (Adaptive Front-Lighting System: AFS) for illuminating a traveling direction when traveling on a curved road.
  • AFS Adaptive Front-Lighting System
  • the rotating shaft 311a is fixed.
  • the swivel actuator 311 is based on the steering amount data provided from the vehicle side, the road shape data provided from the navigation system, the relationship between the front vehicle including the oncoming vehicle and the preceding vehicle and the relative position of the host vehicle, and the like.
  • the headlight unit 9 is swung in the traveling direction around the pivot mechanism 218a.
  • the swivel actuator 311 can be composed of, for example, a stepping motor. If the swivel angle is a fixed value, a solenoid or the like can be used.
  • the swivel actuator 311 is fixed to the unit bracket 224.
  • a leveling actuator 313 arranged outside the lamp body 212 is connected to the unit bracket 224.
  • the leveling actuator 313 is composed of, for example, a motor that extends and contracts the rod 313a in the directions of arrows M and N.
  • the rod 313a extends in the direction of the arrow M
  • the headlight unit 9 swings about the pivot mechanism 218a so as to be in a backward tilted posture.
  • the rod 313a is shortened in the direction of the arrow N
  • the headlight unit 9 swings about the pivot mechanism 218a so as to be in the forward tilted posture.
  • leveling adjustment for directing the optical axis downward can be performed.
  • the optical axis can be adjusted according to the vehicle posture. As a result, it is possible to adjust the reaching distance of the front irradiation light by the vehicle headlight device 100 to an optimum distance.
  • This leveling adjustment can also be executed according to the vehicle posture while the vehicle is running. For example, when the vehicle accelerates while traveling, the vehicle posture becomes a backward leaning posture, and when decelerating, the vehicle posture becomes a forward leaning posture. Therefore, the irradiation direction of the vehicle headlight device 100 also fluctuates up and down according to the posture of the vehicle, and the front irradiation distance becomes longer or shorter. Therefore, by performing the leveling adjustment of the headlight unit 9 in real time based on the vehicle posture, the reaching distance of the front irradiation can be optimally adjusted even while traveling. This is sometimes referred to as "auto leveling".
  • an irradiation control unit 300 (control unit) for executing lighting control of the headlight unit 9 and formation control of a light distribution pattern is arranged. ..
  • an irradiation control unit 300 for controlling the vehicle headlight device 100 is arranged.
  • the irradiation controller 300 also controls the optical axis adjustment of the swivel actuator 311 and the leveling actuator 313.
  • the vehicle headlamp device 100 may have a dedicated irradiation control unit 300 for each of the left and right vehicle headlamp devices 100, or the irradiation control units 300 provided for one of the vehicle headlamp devices 100.
  • the control unit 300 may collectively control the actuators of the left and right vehicle headlight devices 100 and control the formation of the light distribution pattern.
  • Headlight unit 9 can be provided with an aiming adjustment mechanism.
  • an aiming pivot mechanism (not shown) serving as a swing center at the time of aiming adjustment is arranged at a connecting portion between the rod 313a of the leveling actuator 313 and the unit bracket 224.
  • the aiming adjustment screws 220 described above are arranged on the lamp bracket 218 at intervals in the vehicle width direction. For example, when the two aiming adjusting screws 220 are rotated counterclockwise, the headlight unit 9 is tilted forward about the aiming pivot mechanism and the optical axis is adjusted downward. Similarly, when the two aiming adjustment screws 220 are rotated clockwise, the headlight unit 9 is tilted backward around the aiming pivot mechanism and the optical axis is adjusted upward.
  • the headlight unit 9 takes a right-turning posture around the aiming pivot mechanism and the optical axis is adjusted rightward. Further, when the aiming adjustment screw 220 on the right side in the vehicle width direction is rotated counterclockwise, the headlight unit 9 takes a left turning posture around the aiming pivot mechanism and the optical axis is adjusted leftward.
  • This aiming adjustment is performed when the vehicle is shipped, when the vehicle is inspected, or when the vehicle headlight device 100 is replaced. Then, the vehicle headlight device 100 is adjusted to a posture determined by design, and the formation control of the light distribution pattern of the present embodiment is performed based on this posture.
  • the headlight unit 9 includes a plurality of light emitting elements (LEDs) 4, an optical element 3, a projection lens 5, a heat radiating component 6, a structural component 7 for holding the component, and a light emitting element mounting substrate 8.
  • the heat dissipation component 6 is composed of, for example, a heat sink and a fan
  • the structural component 7 is composed of a headlamp housing and the like.
  • the light beam emitted from the light emitting element 4 enters the optical element 3 and is totally reflected and propagates inside.
  • the emission surface of the optical element 3 is arranged at a position of approximately the focal length f of the projection lens 5, and the light distribution distribution formed by the emission surface of the optical element 3 is irradiated to the front of the vehicle through the projection lens 5.
  • 2A and 2B are a side view and a plan view of a schematic configuration of a headlight unit of a conventional vehicle headlight device, respectively.
  • X is the horizontal direction
  • Y is the vertical direction
  • Z is the traveling direction of the vehicle.
  • the headlamp unit includes a low beam optical element 1, a high beam optical element 2, a plurality of light emitting elements 4, a light emitting element mounting substrate 8 and a projection lens 5.
  • the low beam optical element 1 is composed of a plurality of rods 10a to 10e respectively corresponding to the plurality of light emitting elements 4 and an integration unit 11 that integrates the plurality of rods.
  • each rod faces each light emitting element 4, and the surface facing the surface is connected to the integrated portion 11.
  • the integration part 11 is connected to each rod via a connection part, and the surface facing the connection part faces the projection lens 5.
  • the surface of each rod on the side of the light emitting element 4 is referred to as an incident surface
  • the surface of the integrated portion 11 on the side of the projection lens 5 is referred to as an emitting surface.
  • the high beam light emitting element 2 has the same configuration.
  • the low-beam optical element 1 and the high-beam light-emitting element 2 are arranged so as to be stacked, and are in contact with each other near the emission surface.
  • the plurality of light emitting elements 4 are surface light emitting elements, all of which are mounted on the light emitting element mounting substrate 8, and their emission surfaces are arranged so as to face the incident surfaces of the rods of the low beam optical element 1 and the high beam optical element 2. It is arranged.
  • the optical axis of the projection lens 5 is set so as to pass through a portion where the low beam optical element 1 and the high beam optical element 2 are in contact with each other. Further, the focal point of the projection lens 5 is approximately located on the exit surface of the low beam optical element 1 and the exit surface of the high beam optical element 2.
  • each component when forming the low beam distribution is as follows.
  • the plurality of light emitting elements 4 corresponding to the rods of the low beam optical element 1 emit light, and the emitted light flux enters the rods from the rod incident surfaces of the low beam optical element 1.
  • the low-beam optical element 1 propagates a light beam incident on each rod inside and causes the light beam to reach an emission surface via an integrating portion 11.
  • the light that has reached the exit surface of the low beam optical element 1 exits from the low beam optical element 1 and enters the projection lens 5.
  • the projection lens 5 projects the incident light flux in front of the vehicle.
  • the projection lens 5 has a function of converting the illuminance of the surface including the focus into the luminous intensity of the space in front of the vehicle
  • the illuminance pattern of the exit surface of the optical element 1 for low beam is formed as a low beam distribution in front of the vehicle.
  • the functions of the respective constituent elements at the time of forming the high beam light distribution are the same, but in the high beam, ADB is implemented by individually turning on and off the plurality of light emitting elements 4.
  • W is the width of the exit surface of the low-beam optical element 1 and needs to have a size corresponding to the horizontal irradiation range of the desired light distribution.
  • Each rod has a shape that spreads from the light emitting element 4 side toward the integrated portion 11 in order to allow the light flux to reach the entire emission surface of the width W with the limited number of each light emitting element 4.
  • the taper represented by ⁇ a to ⁇ e in the drawing affects the directivity of the light flux emitted from the emission surface of the low beam optical element 1. When the directivity of the emitted light flux is low, the light taking-in rate of the projection lens 5 decreases, so that it is necessary to set ⁇ a to ⁇ e appropriately.
  • the design convenience described here also applies to the high beam optical element 2.
  • FIG. 3A and 3B are diagrams showing an example of low beam ideal light distribution.
  • FIG. 3A is a diagram showing the luminous intensity of light distribution in an angular space in front of the vehicle.
  • the horizontal axis is the horizontal angle
  • the vertical axis is the vertical angle. Isoluminance lines are shown in the figure, and the luminosity is higher toward the inside.
  • FIG. 3B is a diagram showing the luminosity along the horizontal direction near the vertical direction of -1 degree in FIG. 3A.
  • the horizontal axis is the angle in the horizontal direction
  • the vertical axis is the luminous intensity.
  • FIG. 4 is a plan view showing a configuration example of the low beam optical element 1 and each light emitting element.
  • the reference numerals of the respective light emitting elements are 4a, 4b, 4c, 4d and 4e, respectively.
  • the output ratio of the light emitting elements 4a, 4b, 4c, 4d, and 4e is set to 1:2:4:2:1 with the aim of forming a light distribution with high luminous intensity in the center.
  • the rods of the low beam optical element 1 are connected on the projection lens 5 side, but the connection position and the position of the emission surface are the same. That is, the length of the integrated portion 11 in the Z direction is zero.
  • FIG. 5A and 5B are illuminance distributions on the exit surface of the low-beam optical element 1 shown in FIG.
  • FIG. 5A is an image showing a two-dimensional illuminance distribution on the exit surface of the low beam optical element 1. The higher the image brightness, the higher the illuminance.
  • FIG. 5B is a graph showing the illuminance distribution along the horizontal direction near the vertical center of the exit surface of the low-beam optical element 1, where the horizontal axis is the horizontal position and the vertical axis is the illuminance.
  • FIGS. 5A and 5B it can be seen that the configuration of FIG. 4 has a step in the illuminance distribution. This is because the illuminance changes rapidly at the boundaries of the rods of the low beam optical element 1.
  • this illuminance distribution is converted into a brightness distribution in front of the vehicle by the projection lens 5, a step is also generated in the light distribution, which gives the driver a feeling of strangeness.
  • FIG. 6 is a plan view showing another conventional configuration example of the low beam optical element 1 and each light emitting element. 6, the setting of each light emitting element is the same as that of FIG. 4, but the configuration of the low beam optical element 1 is different.
  • the positions of the entrance surface and the exit surface of the low-beam optical element 1 are the same as those of the low-beam optical element 1 of FIG. 4, but the length of the integration section 11 in the Z direction is not zero but is set to the length represented by t in the figure. This is different from the low beam optical element 1 of FIG.
  • FIGS. 7A and 7B are illuminance distributions on the exit surface of the low-beam optical element 1 shown in FIG. How to read the figure is the same as in FIGS. 5A and 5B. As shown in FIGS. 7A and 7B, it can be seen that in the configuration of FIG. 6, the steps of the illuminance distribution are alleviated and the inclination of the illuminance decrease is smooth.
  • FIG. 8 is a diagram for explaining the operation of only one rod.
  • the optical element in FIG. 8 has a configuration in which only one rod of the plurality of rods of the optical element in FIG. 6 is left (for example, the rod 10a) and the other rods are omitted.
  • the broken line in the figure is an extension of the inner wall of the rod 10.
  • the light beam emitted from the light emitting element 4 and entering the rod 10 has its traveling angle limited by the inner wall of the rod 10 and travels inside the optical element to reach the emission surface. Therefore, the reach range of the light beam without the integration unit 11 is the range of d0 in the figure. This is the original irradiation range of the rod 10. However, setting the integration unit 11 allows some rays to reach the outside of d0. The range in which light rays can reach in this way is shown as d1 in the figure.
  • FIGS. 9A and 9B are illuminance distributions on the exit surface of the optical element shown in FIG. How to read the figure is the same as in FIGS. 5A and 5B.
  • FIG. 9A in the configuration of FIG. 8, the left and right contours of the irradiation range are blurred, and the slope of the illuminance is a gentle slope as shown in FIG. 9B.
  • the integration unit 11 has an effect of blurring the contour of the irradiation range covered by each rod and reducing the step of the illuminance distribution. This is the reason why the step difference in the illuminance distribution is relaxed in FIGS. 7A and 7B.
  • the integrated portion 11 has an effect of alleviating the step of the illuminance distribution, but if the thickness t is too large, the irradiation ranges covered by the rods are mixed, and the intensity of the light distribution cannot be adjusted.
  • t is set to a value that can obtain a desired blur amount.
  • a method for setting the peak luminous intensity of the light distribution high a method of increasing the output of the light emitting element 4 forming the central portion of the light distribution and an irradiation range in charge of the rod 10 forming the central portion of the light distribution are used.
  • the irradiation range covered by another rod needs to be widened by the extent that the irradiation range covered by the rod is narrowed. Since it is necessary to increase the output of the light emitting element 4 in order to maintain the illuminance, it is necessary to inject extra energy in the end.
  • FIG. 10 is a diagram showing a reflection state of light rays inside the rod 10 in the present embodiment.
  • the reference of the angle of the light beam is the Z axis, and the counterclockwise direction is the positive angle.
  • the taper of the rod 10 is represented by ⁇ .
  • the initial angle of the light ray is ⁇ 0, the angles are ⁇ 1, ⁇ 2,...
  • the light flux incident on the rod 10 is a light flux emitted from the light emitting element 4 and having a wide divergence angle, it is considered that a large number of light rays with random angles are incident.
  • the light rays that are not reflected by the inner wall surface of the rod 10 are emitted without being subjected to the angle conversion, but the reflected light rays are emitted after being subjected to the angle conversion as shown in equation (1).
  • a light beam having a spread and incident on the rod 10 is narrowed in the spread and exits from the rod 10. That is, the directivity is improved.
  • Fig. 11 shows the results of directivity simulation using the rod model.
  • the light emitting element is Lambertian emission
  • the surface size of the light emitting element is 1 mm ⁇ 1 mm
  • the distance between the light emitting element light emitting surface and the rod incident surface is 0.3 mm
  • the rod incident surface size is 1.8 mm ⁇ 1.8 mm
  • the rod length is 40 mm.
  • the height of the rod emission surface is 4 mm
  • the refractive index of the rod material is 1.59.
  • the directivity of the rod 10 forming the central portion of the light distribution is set lower than the directivity of other rods.
  • FIG. 12 is a diagram for explaining the operation of the rod forming the central portion of the light distribution. That is, in FIG. 12, the reference numeral of the rod forming the central portion of the light distribution is 10c. Further, rods unrelated to the description are omitted. Further, for comparison, FIG. 8 is referred to in order to explain the operation of a rod which is not the rod forming the central portion of the light distribution. Note that, in FIG. 12, the output of the light emitting element 4 and the thickness t of the integrated portion 11 are the same as those in FIG.
  • the width d01 of the region formed by the extension of the inner wall of the rod 10c and the intersection of the emission surface of the optical element is the width d0 of the region formed by the extension of the inner wall of the rod 10a and the intersection of the emission surface of the optical element in FIG.
  • the rod 10c is set to be narrower than the rod 10a
  • the reach range d11 of the light beam emitted from the rod 10c in FIG. 12 is smaller than that of the light beam emitted from the rod 10a in FIG. It is wider than the reach range d1.
  • FIGS. 13A and 13B show illuminance distributions on the exit surface of the optical element shown in FIG. 12, respectively. How to read the figure is the same as in FIGS. 5A and 5B.
  • the irradiation range is wider and the peak is lower in FIGS. 13A and 13B.
  • the lowering of the peak is due to the large divergence of the light beam emitted from the rod 10c, and the light that should contribute to the illuminance peak portion has escaped to the outside.
  • FIG. 14 is a diagram showing a configuration in which the thickness of the integrated portion 11 in FIG. 12 is reduced to t1 (t1 ⁇ t).
  • the width d01 of the region formed by the extension of the inner wall of the rod 10c and the intersection with the emission surface is equal to d01 in FIG.
  • the thickness of the integrated portion 11 is set to t1 so that the arrival range d111 of the radiation beam from the rod becomes equal to d1 in FIG. 15A and 15B show illuminance distributions on the exit surface of the optical element shown in FIG. How to read the figure is the same as in FIGS. 5A and 5B.
  • FIGS. 9A and 9B in FIGS.
  • the peaks are improved while the irradiation ranges are the same.
  • the integrated portion 11 is thinner than that in FIG. 8, but as shown in FIGS. 15A and 15B, the effect of blurring the outline of the irradiation range covered by the rod 10c is maintained to the same degree.
  • FIG. 16 is a diagram for explaining this principle.
  • a rod 10c is a rod forming a central portion of the light distribution, and is arranged closest to the optical axis of the projection lens 5 among the plurality of rods.
  • the rod 10a is a representative of other rods, but is particularly a rod arranged at a position farthest from the optical axis.
  • ⁇ a represents the divergence angle of the luminous flux emitted from the rod 10a.
  • FIG. 17 is a plan view showing a configuration example of the low beam optical element 1 and each light emitting element in the present embodiment.
  • the plurality of light emitting elements are mounted on the light emitting element mounting substrate 8 and the configuration and function of the projection lens 5 are the same as those of the conventional example.
  • the output ratio of the light emitting elements 4a, 4b, 4c, 4d, 4e is 1:2:4:2:1.
  • the reference numerals of the rods are 10a to 10e, which correspond to the light emitting elements 4a to 4e, respectively.
  • the light emitting element 4c and the rod 10c are the light emitting element and the rod that form the center of the light distribution.
  • the parameters of the rod 10c are the same as those of the rod 10c shown in FIG.
  • the taper ⁇ c is smaller than the taper ⁇ a, ⁇ b, ⁇ d, and ⁇ e of the other rods, and the width d01 of the region formed by the intersection of the extension of the inner wall of the rod 10c and the emission surface is the extension of the inner wall of the other rod and the emission surface. It is smaller than the width d0 of the region formed by the intersection of Further, the thickness of the integrated portion 11 is different between the connecting portion of the rod 10c and the connecting portion of other rods, and the thickness of the connecting portion of the rod 10c is t1 in FIG. 14 and the connecting portion of other rods. Is t in FIG.
  • FIGS. 18A and 18B show illuminance distributions on the exit surface of the low-beam optical element 1 in the configuration example of the present embodiment shown in FIG. How to read FIGS. 18A and 18B is the same as that in FIGS. 5A and 5B.
  • FIGS. 7A and 7B are illuminance distributions on the exit surface of the low-beam optical element 1 in the conventional configuration shown in FIG.
  • the taper ⁇ c of the rod 10c is made equal to the taper ⁇ a, ⁇ b, ⁇ d, and ⁇ e of the other rods, and it can be obtained by extending the inner wall of the rod 10c and intersecting the emission surface.
  • the width d01 of the region is equal to the width d0 of the region formed by the extension of the inner wall of the other rod and the intersection with the emission surface
  • the thickness t1 of the connecting portion of the rod 10c of the integrated portion 11 is the same as that of the connecting portion of the other rod. It is set equal to the thickness t.
  • the illuminance gradient in the horizontal direction is similarly smooth and the peak value is improved as compared with FIGS. 7A and 7B.
  • the number of rods is five, but the number of rods may be plural, and the number is not limited to five or an odd number.
  • the present invention is not limited to these.
  • both the conventional example and the example have been described by limiting to the low beam optical element, but since there is a demand to form a peak of light distribution in the high beam as in the low beam, the present invention is applied to the high beam optical element. It doesn't matter.
  • the description has been limited to the technique for realizing the low beam and the high beam compatible with ADB by one headlight unit, but the present invention is not limited to these, and the low beam and the ADB are not compatible.
  • a headlamp unit that realizes a high beam, or a headlamp unit that includes only a low beam, a high beam that supports ADB, and a high beam that does not support ADB, has a similar optical element as a constituent element. If so, it can be applied.
  • Optical element for low beam 1: Optical element for low beam
  • 2 Optical element for high beam
  • 3 Optical element
  • 4 Light emitting element (LED)
  • 5 Projection lens
  • 8 Light emitting element mounting substrate
  • 9 Headlight unit
  • 10 Rod
  • 11 integrated unit
  • 100 vehicle headlight device

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un élément optique, une unité de phare de véhicule dans laquelle ledit élément optique est utilisé, et un dispositif de phare de véhicule, ledit élément optique pouvant augmenter l'efficacité énergétique et former un pic de luminosité de lumière distribuée dans une unité de phare dans laquelle une pluralité d'éléments électroluminescents, d'éléments optiques et de lentilles de projection sont utilisés.　Par conséquent, dans l'élément optique utilisé pour le dispositif de phare de véhicule, l'élément optique comprend une pluralité de tiges qui propagent individuellement la lumière émise par la pluralité d'éléments électroluminescents, et une unité d'intégration qui connecte et relie la pluralité de tiges entre elles. La tige parmi la pluralité de tiges dont la lumière d'irradiation contribue le plus à la formation du pic de luminosité de lumière distribuée a une directivité inférieure à celle des autres tiges, et l'épaisseur de l'unité d'intégration dans la direction de la lumière émise par le site de connexion de l'unité d'intégration est inférieure à celle des autres tiges.
PCT/JP2018/045040 2018-12-07 2018-12-07 Élément optique, unité de phare de véhicule dans laquelle ledit élément optique est utilisé, et dispositif de phare de véhicule WO2020115887A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2020558773A JP7152511B2 (ja) 2018-12-07 2018-12-07 光学素子、それを用いた車両用前照灯ユニット、及び、車両用前照灯装置
PCT/JP2018/045040 WO2020115887A1 (fr) 2018-12-07 2018-12-07 Élément optique, unité de phare de véhicule dans laquelle ledit élément optique est utilisé, et dispositif de phare de véhicule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/045040 WO2020115887A1 (fr) 2018-12-07 2018-12-07 Élément optique, unité de phare de véhicule dans laquelle ledit élément optique est utilisé, et dispositif de phare de véhicule

Publications (1)

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WO2020115887A1 true WO2020115887A1 (fr) 2020-06-11

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PCT/JP2018/045040 WO2020115887A1 (fr) 2018-12-07 2018-12-07 Élément optique, unité de phare de véhicule dans laquelle ledit élément optique est utilisé, et dispositif de phare de véhicule

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JP (1) JP7152511B2 (fr)
WO (1) WO2020115887A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105423209A (zh) * 2014-09-16 2016-03-23 法雷奥照明公司 使用多源光学透镜的车辆照明装置
JP2016184578A (ja) * 2015-03-13 2016-10-20 ヴァレオ ビジョンＶａｌｅｏ Ｖｉｓｉｏｎ 光導波路を備えた照明装置
WO2017122629A1 (fr) * 2016-01-13 2017-07-20 三菱電機株式会社 Module de phares, et dispositif de phare
JP2018055907A (ja) * 2016-09-28 2018-04-05 株式会社日立情映テック 車両用前照灯装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105423209A (zh) * 2014-09-16 2016-03-23 法雷奥照明公司 使用多源光学透镜的车辆照明装置
JP2016184578A (ja) * 2015-03-13 2016-10-20 ヴァレオ ビジョンＶａｌｅｏ Ｖｉｓｉｏｎ 光導波路を備えた照明装置
WO2017122629A1 (fr) * 2016-01-13 2017-07-20 三菱電機株式会社 Module de phares, et dispositif de phare
JP2018055907A (ja) * 2016-09-28 2018-04-05 株式会社日立情映テック 車両用前照灯装置

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JP7152511B2 (ja) 2022-10-12
JPWO2020115887A1 (ja) 2021-09-27

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