WO2020066406A1 - Light shining device - Google Patents

Light shining device Download PDF

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Publication number
WO2020066406A1
WO2020066406A1 PCT/JP2019/033218 JP2019033218W WO2020066406A1 WO 2020066406 A1 WO2020066406 A1 WO 2020066406A1 JP 2019033218 W JP2019033218 W JP 2019033218W WO 2020066406 A1 WO2020066406 A1 WO 2020066406A1
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WO
WIPO (PCT)
Prior art keywords
light
mirror
line
reflected
reflection
Prior art date
Application number
PCT/JP2019/033218
Other languages
French (fr)
Japanese (ja)
Inventor
達磨 北澤
健太 向島
Original Assignee
株式会社小糸製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Priority to JP2020548194A priority Critical patent/JPWO2020066406A1/en
Publication of WO2020066406A1 publication Critical patent/WO2020066406A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a light irradiation device.
  • an apparatus that reflects light emitted from a light source toward the front of a vehicle and scans an area in front of the vehicle with the reflected light to form a predetermined light distribution pattern.
  • a plurality of light sources composed of light emitting elements, and a blade scan (registered trademark) that forms a desired light distribution pattern by reflecting light emitted from the plurality of light sources on a reflecting surface while rotating in one direction around a rotation axis.
  • An optical unit that uses a polygon mirror instead of a rotating reflector is also known. In such an optical unit, there is room for improvement in controlling the light distribution pattern.
  • optical units using polygon mirrors are becoming smaller. Accordingly, the distance between the polygon mirror and a surface from which light is emitted from the optical unit (light emitting surface) is also becoming narrower. As a result, the diffusion width of the light distribution pattern is reduced.
  • the light irradiation device provided with such a polygon mirror has room for improvement in this respect.
  • an object of the present invention is to provide a light irradiation device that can make a part of a light distribution pattern brighter than other parts, that is, can increase the luminous intensity of at least a part of the light distribution pattern.
  • Another object of the present invention is to provide a light irradiation device that can reduce the size of an optical unit without reducing the diffusion width of a light distribution pattern.
  • a light irradiation device is: Light source, A rotatable mirror that reflects light emitted from the light source, With A light irradiating device, wherein the light is divided into a plurality of stages and scanned in a line to form a light distribution pattern by displacing the reflection direction of the light by rotation of the mirror,
  • the mirror includes at least one reflection surface, and the curvature in the rotation direction of the mirror changes at the at least one reflection surface.
  • the scanning speed of light changes according to the change in curvature, it is possible to make a part of the light distribution pattern brighter than other parts. Further, it is not necessary to change the output of the light source in order to make a part of the light distribution pattern brighter than the other parts, so that the output control of the light source becomes easy.
  • the curvature is set such that the scanning speed of the light for forming the central region of the line in the scanning direction of the light is lower than the scanning speed of the light for forming the region other than the central region. It may be.
  • the luminous intensity of the central region of the line in the light scanning direction can be higher than the luminous intensity of the other regions.
  • the at least one reflecting surface may include a flat surface and a convex or concave curved surface in the rotation direction.
  • a part of the light distribution pattern can be made brighter than other parts with a simple configuration.
  • a light irradiation device is: Light source, A rotatable mirror that reflects light emitted from the light source, With A light irradiating device, wherein the light is divided into a plurality of stages and scanned in a line to form a light distribution pattern by displacing the reflection direction of the light by rotation of the mirror,
  • the mirror has a plurality of reflection surfaces arranged along a rotation direction of the mirror, The plurality of reflecting surfaces are configured such that at least a part of the light overlaps on the same line that forms at least a part of the light distribution pattern.
  • the luminous intensity of at least a part of the light distribution pattern can be increased by overlapping the light on the same line.
  • the light reflected by at least two of the plurality of reflecting surfaces may form the same line that forms at least a part of the light distribution pattern.
  • the same line is formed by the plurality of reflection surfaces, the luminous intensity of at least a part of the light distribution pattern can be increased.
  • the light distribution pattern includes a plurality of first lines, and a second line disposed between the plurality of first lines,
  • the at least two reflecting surfaces may be configured such that the light reflected by the at least two reflecting surfaces forms the second line.
  • the luminous intensity at the center of the light distribution pattern can be increased.
  • a light irradiation device is: Light source, A rotatable first mirror that reflects light emitted from the light source, With A light irradiation device, wherein the light is divided into a plurality of stages and scanned in a line by the displacement of the reflection direction of the light by rotation of the first mirror, The apparatus further includes a second mirror that reflects light reflected by the first mirror.
  • the light reflected by the first mirror is further reflected by the second mirror.
  • the optical path from the reflection surface of the first mirror to the light emission surface of the light irradiation device is longer than when the light is reflected only by the first mirror.
  • the optical device may further include an optical member that transmits light reflected by the second mirror.
  • the optical member includes a phosphor and a projection lens,
  • the phosphor is disposed between the first mirror and the projection lens,
  • the light reflected by the second mirror is scanned on the phosphor,
  • Light emitted from the phosphor is transmitted through the projection lens and emitted.
  • the optical path from the reflection surface of the first mirror to the phosphor can be made longer than when the light is reflected only by the first mirror.
  • the size of the optical unit can be reduced.
  • the mirror may be configured as a polygon mirror.
  • a light irradiation device that can make a part of the light distribution pattern brighter than other parts, that is, can increase the luminous intensity of at least a part of the light distribution pattern.
  • the present invention it is possible to provide a light irradiation device that can reduce the size of the optical unit without reducing the diffusion width of the light distribution pattern.
  • FIG. 3 is a top view of the optical unit in FIG. 2.
  • FIG. 3 is a side view of the optical unit in FIG. 2.
  • FIG. 5 is a side view illustrating a state where a rotating mirror is rotated in the optical unit of FIG. 4.
  • FIG. 3 is a schematic diagram illustrating an example of a light distribution pattern formed in front of a vehicle by the optical unit in FIG. 2.
  • FIG. 3 is a top view of the optical unit according to the first embodiment.
  • FIG. 8 is an enlarged view showing one reflection surface of a rotating mirror in the optical unit of FIG. 7.
  • FIG. 8 is an enlarged view showing one reflection surface of a rotating mirror in the optical unit of FIG. 7.
  • FIG. 8 is a schematic diagram illustrating an example of a light distribution pattern formed in front of a vehicle by the optical unit in FIG. 7.
  • FIG. 10 is a diagram illustrating a rotating mirror according to a first modification. It is a figure showing one reflective surface of a rotation mirror of the first modification.
  • FIG. 14 is a diagram illustrating a rotating mirror according to a second modification. It is a figure showing one reflective surface of a rotation mirror of the second modification.
  • FIG. 13 is a schematic diagram illustrating an example of a light distribution pattern formed in front of a vehicle by an optical unit including the rotating mirror in FIG. 12.
  • FIG. 14 is a diagram illustrating a rotating mirror according to a third modification. It is a figure showing one reflective surface of a rotation mirror of the third modification.
  • FIG. 19 is a schematic diagram illustrating an example of a light distribution pattern formed in front of the vehicle by the optical unit in FIG. 18. It is a top view of the optical unit concerning a 5th modification. It is a top view of the optical unit concerning a 6th modification. It is a schematic diagram which shows an example of the light distribution pattern which concerns on a 5th modification and a 6th modification. It is the perspective view which showed typically the structure of the optical unit which concerns on 3rd embodiment.
  • FIG. 24 is a top view of the optical unit of FIG. 23.
  • FIG. 24 is a schematic diagram illustrating an example of a light distribution pattern formed in front of the vehicle by the optical unit of FIG. 23. It is a perspective view showing typically composition of an optical unit concerning a 4th embodiment.
  • FIG. 27 is a side view of the optical unit of FIG. 26.
  • FIG. 27 is a schematic diagram illustrating an example of a light distribution pattern formed in front of the vehicle by the optical unit of FIG. 26. It is a top view of the optical unit concerning a 5th embodiment.
  • the “left-right direction”, “front-back direction”, and “up-down direction” are relative directions set for the vehicle headlight shown in FIG. 1 for convenience of description.
  • the “front-back direction” is a direction including the “front direction” and the “back direction”.
  • the “left-right direction” is a direction including “left direction” and “right direction”.
  • the “vertical direction” is a direction including “upward” and “downward”.
  • the optical unit (an example of a light irradiation device) of the present invention can be used for various vehicle lamps. First, an outline of a vehicle headlamp on which an optical unit according to each embodiment described later can be mounted will be described.
  • FIG. 1 is a horizontal sectional view of a vehicle headlamp.
  • FIG. 2 is a perspective view schematically showing a configuration of an optical unit mounted on the vehicle headlight of FIG.
  • FIG. 3 is a top view of the optical unit, and
  • FIGS. 4 and 5 are side views of the optical unit.
  • the vehicle headlamp 10 shown in FIG. 1 is a right headlamp mounted on the right side of the front end of the vehicle, and has the same structure as the headlamp mounted on the left side except that it is symmetrical. Therefore, hereinafter, the right vehicle headlamp 10 will be described in detail, and the description of the left vehicle headlamp will be omitted.
  • the vehicle headlamp 10 includes a lamp body 12 having a concave portion that opens forward.
  • the lamp body 12 has a front opening covered with a transparent front cover 14 to form a lamp chamber 16.
  • the light room 16 functions as a space in which the two lamp units 20 and 30 are housed in a state of being arranged side by side in the vehicle width direction.
  • the lamp unit 20 arranged inside the vehicle width direction that is, the lower side shown in FIG. 1 in the right vehicle headlamp 10 is configured to emit a low beam.
  • the lamp unit 30 disposed outside in the vehicle width direction that is, the upper side shown in FIG. 1 of the right vehicle headlamp 10 is a lamp unit having a lens 36. , And a variable high beam.
  • the low beam lamp unit 20 has a reflector 22 and a light source 24 made of, for example, an LED.
  • the reflector 22 and the LED light source 24 are tiltably supported with respect to the lamp body 12 by known means (not shown), for example, means using an aiming screw and a nut.
  • the high beam lamp unit 30 includes a light source 32, a rotating mirror 34 as a reflector, and a plano-convex lens as a projection lens disposed in front of the rotating mirror 34. 36, and a phosphor 38 disposed between the rotating mirror 34 and the plano-convex lens 36.
  • the light source 32 for example, a laser light source can be used. Instead of a laser light source, a semiconductor light emitting element such as an LED or an EL element can be used as a light source.
  • the light source 32 can be turned on and off by a light source control unit (not shown). In particular, for controlling a light distribution pattern described later, it is preferable to use a light source capable of turning on and off accurately in a short time.
  • the light source control unit includes, for example, at least one electronic control unit (ECU: Electronic Control Unit).
  • the electronic control unit may include at least one microcontroller including one or more processors and one or more memories, and other electronic circuits including active elements such as transistors and passive elements.
  • the processor is, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit) and / or a GPU (Graphics Processing Unit).
  • the memory includes a ROM (Read Only Memory) and a RAM (Random Access Memory).
  • the control program of the lamp unit 30 may be stored in the ROM.
  • the shape of the plano-convex lens 36 may be appropriately selected according to the light distribution characteristics such as a required light distribution pattern and illuminance distribution, and an aspheric lens or a free-form surface lens is used.
  • the rear focus of the plano-convex lens 36 is set, for example, near the light emitting surface of the phosphor 38. As a result, the light image on the light emitting surface of the phosphor 38 is turned upside down and is irradiated forward.
  • the phosphor 38 is made of, for example, a resin material mixed with phosphor powder that emits yellow light when excited by blue laser light emitted from the light source 32.
  • the laser light emitted from the phosphor 38 by mixing the blue laser light and the yellow fluorescent light becomes white light.
  • the rotating mirror 34 is rotatably connected to a motor 40 as a driving source.
  • the rotating mirror 34 is rotated by a motor 40 in a rotation direction D about a rotation axis R.
  • the rotation axis R of the rotation mirror 34 is oblique to the optical axis Ax (see FIG. 4).
  • the rotating mirror 34 includes a plurality of (12 in this example) reflecting surfaces 34a to 34l arranged along the rotating direction D.
  • the reflecting surfaces 34a to 34l of the rotating mirror 34 reflect the light emitted from the light source 32 while rotating. This enables scanning using light from the light source 32 as shown in FIG.
  • the rotating mirror 34 is, for example, a polygon mirror in which twelve reflecting surfaces are formed in a polygonal shape.
  • the reflecting surface 34a and the reflecting surface 34g located on the diagonally opposite side of the reflecting surface 34a are referred to as a first reflecting surface pair 34A.
  • the reflecting surface 34b and the reflecting surface 34h located on the diagonally opposite side of the reflecting surface 34b are defined as a second reflecting surface pair 34B.
  • the reflecting surface 34c and the reflecting surface 34i located on the diagonally opposite side of the reflecting surface 34c are defined as a third reflecting surface pair 34C.
  • the reflecting surface 34d and the reflecting surface 34j on the diagonally opposite side of the reflecting surface 34d are defined as a fourth reflecting surface pair 34D.
  • the reflecting surface 34e and the reflecting surface 34k located on the diagonally opposite side of the reflecting surface 34e are referred to as a fifth reflecting surface pair 34E.
  • the reflecting surface 34f and the reflecting surface 341 located on the diagonally opposite side of the reflecting surface 34f are referred to as a sixth reflecting surface pair 34F.
  • the first reflecting surface pair 34A is a surface formed in the up-down direction and the front-back direction when the laser light from the light source 32 is reflected by the reflecting surface 34a (that is, in the case of the arrangement shown in FIGS. 3 and 4).
  • the corners are formed to be substantially the same.
  • the second reflecting surface pair 34B is a surface formed in the up-down direction and the front-back direction when the laser light from the light source 32 is reflected by the reflecting surface 34b (that is, in the case of the arrangement shown in FIG. 5).
  • the corners are formed to be substantially the same.
  • the third pair of reflecting surfaces 34C includes an angle formed between the reflecting surface 34c and the optical axis Ax when the laser light from the light source 32 is reflected by the reflecting surface 34c, and the laser light from the light source 32 is reflected by the reflecting surface 34i.
  • the angle formed between the reflecting surface 34i and the optical axis Ax at the time of reflection is substantially the same.
  • the fourth reflecting surface pair 34D is formed by an angle between the reflecting surface 34d and the optical axis Ax when the laser light from the light source 32 is reflected by the reflecting surface 34d, and the laser light from the light source 32 is reflected by the reflecting surface 34j.
  • the angle formed between the reflection surface 34j and the optical axis Ax at the time of reflection is substantially the same.
  • the fifth reflection surface pair 34E is formed by an angle between the reflection surface 34e and the optical axis Ax when the laser light from the light source 32 is reflected by the reflection surface 34e, and the laser light from the light source 32 is reflected by the reflection surface 34k.
  • the angle formed between the reflection surface 34k and the optical axis Ax at the time of reflection is substantially the same.
  • the sixth reflection surface pair 34F is formed such that the angles formed by the reflection surfaces 34f and 34l and the optical axis Ax by the laser light from the light source 32 are substantially the same. That is, each of the reflecting surfaces 34a to 34l of the rotating mirror 34 is formed such that a pair of diagonal reflecting surfaces are inclined surfaces having the same angle.
  • the light reflected by the pair of reflecting surfaces constituting the first reflecting surface pair 34A to the sixth reflecting surface pair 34F is applied to substantially the same position in the vertical direction in front of the vehicle. Further, it is possible to prevent the rotation of the rotating mirror 34 when the rotating mirror 34 is rotated in the rotation direction D by the motor 40.
  • the angle ⁇ a between the first reflecting surface pair 34A and the optical axis Ax is determined by the angle ⁇ a between the laser light from the light source 32 and the other reflecting surface.
  • the angles formed by the respective reflection surfaces of the other reflection surface pairs 34B to 34F and the optical axis Ax when reflected by the pairs 34B to 34F are different from each other.
  • the angle ⁇ b between the reflection surface 34b and the optical axis Ax shown in FIG. 5 is formed to be slightly smaller than the angle ⁇ a between the reflection surface 34a and the optical axis Ax shown in FIG.
  • each reflecting surface pair and the optical axis Ax are formed so that the angle formed by them becomes smaller.
  • the light reflected by one pair of reflecting surfaces is applied to a position different from that of the other pair of reflecting surfaces in the vertical direction in front of the vehicle.
  • the light Lb reflected by the reflection surface 34b is irradiated above the light La reflected by the reflection surface 34a on the virtual vertical screen in front of the vehicle.
  • a light distribution pattern P1 as shown in FIG. 6 is formed on the virtual vertical screen. Specifically, the lowermost line LA1 of the light distribution pattern P1 shown in FIG. 6 is formed by the light reflected by the first reflection surface pair 34A (reflection surfaces 34a and 34g). Further, a line LB1 is formed above the line LA1 by the light reflected by the second pair of reflection surfaces 34B (the reflection surfaces 34b and 34h).
  • the line LC1 is formed above the line LB1 by the light reflected by the third pair of reflection surfaces 34C (the reflection surfaces 34c and 34i).
  • the line LD1 is formed above the line LC1 by the light reflected by the fourth reflection surface pair 34D (reflection surfaces 34d and 34j).
  • the line LE1 is formed above the line LD1 by the light reflected by the fifth reflection surface pair 34E (the reflection surfaces 34e and 34k).
  • the line LF1 is formed above the line LE1 by the light reflected by the sixth reflection surface pair 34F (the reflection surfaces 34f and 34l). As described above, the light reflection direction is changed by the rotation of the rotating mirror 34, so that the light is divided into a plurality of stages and scanned in a line to form the light distribution pattern P1.
  • the light source control unit controls the turning on and off of the light source 32 so that the light source 32 is turned off at the timing when the boundary between the respective reflection surfaces 34a to 34l and the laser beam from the light source 32 intersect.
  • the light source 32 provided is relatively small, and the position where the light source 32 is disposed is also between the rotating mirror 34 and the plano-convex lens 36 and is shifted from the optical axis Ax. ing. Therefore, the length of the vehicle headlamp 10 in the vehicle front-rear direction is smaller than that in the case where the light source, the reflector, and the lens are arranged in a line on the optical axis as in a conventional projector type lamp unit. Can be shorter.
  • FIG. 7 shows a top view of the lamp unit 130 according to the first embodiment.
  • the lamp unit 130 includes a light source 32, a rotating mirror 134, a plano-convex lens 36, and a phosphor 38.
  • the rotating mirror 134 of the lamp unit 130 has a plurality of (12 in this example) reflecting surfaces 134a to 134l arranged in parallel along the rotating direction D.
  • the reflecting surfaces 134a to 134l of the rotating mirror 134 are configured such that the curvature of the reflecting surface in the rotation direction D of the rotating mirror 134 changes at each reflecting surface.
  • FIG. 8 is an enlarged view showing the configuration of one of the reflecting surfaces 134a to 134l of the rotating mirror 134, for example, the reflecting surface 134a.
  • the reflection surface 134a is constituted by two flat surfaces 135 and one concave curved surface 136.
  • the concave curved surface 136 is disposed at the center of the reflecting surface 134a in the rotation direction D.
  • the two planes 135 are arranged on both sides of the concave curved surface 136 so as to sandwich the concave curved surface 136 in the rotation direction D.
  • the two flat surfaces 135 and the concave curved surface 136 interposed therebetween are formed so as to be continuously connected.
  • the two planes 135 are formed so as to be inclined downward toward the concave curved surface 136 side (the center of the reflection surface 134a).
  • the concave curved surface 136 is formed as a curved reflective surface concave toward the rotation axis R (see FIG. 7).
  • the inclination angle of the plane 135 is set so that the laser beam emitted from the light source 32 to each plane 135 is reflected toward the phosphor 38 at a predetermined diffusion angle.
  • the length xb of the concave curved surface 136 on a straight line connecting both end portions of the concave curved surface 136 and the degree of curvature of the concave curved surface 136 are determined by the laser light emitted from the light source 32 to the concave curved surface 136. Is set to be reflected at a predetermined diffusion angle toward. For example, the length xa of the plane 135 is set to be longer than the length xb of the concave curved surface 136.
  • the laser light reflected by the reflecting surface 134a having such a configuration is, as shown in FIG.
  • the light is diffused by the diffusion angle Wab.
  • the laser light reflected by the concave curved surface 136 is diffused in the left-right direction of the lamp unit 130 by the diffusion angle Wa about the optical axis Ax.
  • the laser light reflected on the two planes 135 is diffused by a diffusion angle Wb on both sides of the laser light reflected on the concave curved surface 136 in the left-right direction of the lamp unit 130.
  • the other reflecting surfaces 134b to 134l constituting the rotating mirror 134 are formed to have the same configuration as the reflecting surface 134a.
  • the angle between the reflection surface 134a and the optical axis Ax when the laser light emitted from the light source 32 is reflected by the reflection surface 134a is determined when the laser light emitted from the light source 32 is reflected by the reflection surface 134g. It is formed so that the angle formed by the reflection surface 134g and the optical axis Ax is substantially the same (see FIGS. 4 and 5). Similarly, the angle formed between the reflection surface 134b and the optical axis Ax is formed to be substantially the same as the angle formed between the reflection surface 134h and the optical axis Ax.
  • the angle between the reflection surface 134c and the optical axis Ax is formed to be substantially the same as the angle between the reflection surface 134i and the optical axis Ax.
  • the angle formed between the reflection surface 134d and the optical axis Ax is formed to be substantially the same as the angle formed between the reflection surface 134j and the optical axis Ax.
  • the angle between the reflection surface 134e and the optical axis Ax is formed to be substantially the same as the angle between the reflection surface 134k and the optical axis Ax.
  • the angle between the reflection surface 134f and the optical axis Ax is formed to be substantially the same as the angle between the reflection surface 134l and the optical axis Ax.
  • the reflecting surfaces 134a to 134l of the rotating mirror 134 are formed such that a pair of diagonal reflecting surfaces are inclined at the same angle as in the reference embodiment.
  • the laser light reflected by the reflecting surfaces 134a and 134g is applied to substantially the same position in the vertical direction in front of the vehicle.
  • laser light reflected by the reflecting surfaces 134b and 134h, laser light reflected by the reflecting surfaces 134c and 134i, laser light reflected by the reflecting surfaces 134d and 134j, and reflecting surface 134e The laser light reflected by the reflection surface 134k and the laser light reflected by the reflection surface 134f and the reflection surface 134l are applied to substantially the same position in the vertical direction in front of the vehicle.
  • the angle formed between one reflection surface pair and the optical axis Ax is formed so as to be different from the angle formed between the other reflection surface pair and the optical axis Ax.
  • the angle formed between the reflection surfaces 134b and 134h and the optical axis Ax is formed to be slightly smaller than the angle formed between the reflection surfaces 134a and 134g and the optical axis Ax.
  • the reflecting surfaces 134c and 134i, the reflecting surfaces 134d and 134j, the reflecting surfaces 134e and 134k, the reflecting surfaces 134f and 134l the angle formed between each reflecting surface pair and the optical axis Ax. Is formed to be small.
  • the laser light reflected by one reflection surface pair is applied to a position different from the laser light reflected by the other reflection surface pair in the vertical direction in front of the vehicle.
  • the laser light reflected by the reflecting surfaces 134b and 134h is irradiated above the laser light reflected by the reflecting surfaces 134a and 134g.
  • the laser light reflected by the reflecting surfaces 134c and 134i is irradiated above the light reflected by the reflecting surfaces 134b and 134h.
  • FIG. 9 is a diagram in which a light distribution pattern P2 formed in front of the vehicle by the lamp unit 130 according to the first embodiment is observed from the vehicle side.
  • the light distribution pattern P2 is formed by a laser beam that is divided into a plurality of stages (six in this example) and scanned in lines (LA2 to LF2).
  • the laser light emitted from the light source 32 is reflected by the reflecting surfaces 134a to 134l of the rotating mirror 134, and passes through the plano-convex lens 36 via the phosphor 38.
  • the rear focal point of the plano-convex lens 36 is set near the light emitting surface of the phosphor 38, so that the light image on the light emitting surface of the phosphor 38 is inverted upside down and irradiated forward.
  • the lowermost first line LA2 of the light distribution pattern P2 shown in FIG. 9 is formed by the laser light reflected by the reflection surface 134a.
  • the second line LB2 is formed above the first line LA2 by the laser light reflected by the reflection surface 134b.
  • the third line LC2 is formed above the second line LB2 by the laser light reflected by the reflection surface 134c.
  • the fourth line LD2 is formed above the third line LC2 by the laser light reflected by the reflection surface 134d.
  • the fifth line LE2 is formed above the fourth line LD2 by the laser beam reflected by the reflection surface 134e.
  • the sixth line LF2 is formed above the fifth line LE2 by the laser beam reflected by the reflection surface 134f.
  • first line LA2, the second line LB2, the third line LC2, the fourth line LD2, the fifth line LE2, and the sixth line are formed by the light reflected by the reflecting surfaces 134g, 134h, 134i, 134j, 134k, and 134l.
  • Lines LF2 are respectively formed.
  • the light source is rotated from the light source. It is conceivable to adopt a light source control method in which the amount of light radiated toward the mirror is changed for each portion within each reflection surface. However, in this method, the output of the light source must be frequently changed at a short timing for each reflection surface, and the control becomes complicated. Further, it is necessary to change the output of the light source, and the light use efficiency may decrease.
  • the lamp unit 130 is configured such that the curvature of the reflection surface in the rotation direction D of the rotation mirror 134 changes in each of the reflection surfaces 134a to 134l of the rotation mirror 134.
  • each of the reflecting surfaces 134a to 134l is formed by two flat surfaces disposed on both sides of the concave curved surface 136 so as to sandwich the concave curved surface 136 disposed at the center of the reflecting surface. 135.
  • the laser light reflected on the concave curved surface 136 at the central portion is compared with the laser light reflected on the plane 135 disposed on both sides of the concave curved surface 136 in the central direction (on the optical axis Ax side). ).
  • the scanning speed of the light forming the central region of each line depends on the side region of each line. It becomes slower than the scanning speed of the light to be formed. Therefore, according to the lamp unit 130, as shown in FIG. 9, when the light distribution pattern P2 is formed, the central region Lwa in the left and right direction (the region shown by oblique lines in FIG. 9) in each line (LA2 to LF2).
  • the luminous intensity can be higher than the luminous intensity of the side region Lwb of each line.
  • FIG. 10 is a diagram illustrating a configuration of a rotating mirror 144 according to a first modification
  • FIG. 11 is a diagram illustrating a configuration of one reflection surface 144a of the rotating mirror 144.
  • the rotating mirror 144 includes a plurality of (for example, 12) reflecting surfaces 144a to 144l arranged in parallel along the rotation direction D, similarly to the rotating mirror 134 shown in FIG. I have.
  • the reflecting surfaces 144a to 144l of the rotating mirror 144 are configured such that the curvature of the reflecting surface in the rotation direction D of the rotating mirror 144 changes at each reflecting surface.
  • the reflection surface 144a is composed of two convex curved surfaces 145 and one flat surface 146.
  • the plane 146 is disposed at the center of the reflection surface 144a in the rotation direction D.
  • the two convex curved surfaces 145 are arranged on both sides of the plane 146 so as to sandwich the plane 146 in the rotation direction D.
  • the two convexly curved surfaces 145 and the plane 146 sandwiched therebetween are formed so as to be continuously connected.
  • the convex curved surface 145 is formed as a curved reflective surface protruding outward from the rotating mirror 144.
  • a convex curve on a straight line connecting the ends of the two convex curved surfaces 145 that is, a straight line connecting the left end of the left convex curved surface 145 and the right end of the right convex curved surface 145 in FIG.
  • the length xa1 of the surface 145 and the degree of curvature of the convex curved surface 145 are set so that the laser light emitted from the light source 32 to each convex curved surface 145 is reflected toward the phosphor 38 at a predetermined diffusion angle. Have been.
  • the length xb1 of the plane 146 on a straight line connecting both ends of the plane 146 is set so that the laser beam emitted from the light source 32 to the plane 146 is reflected toward the phosphor 38 at a predetermined diffusion angle.
  • the length xa1 of the convex curved surface 145 is set to be longer than the length xb1 of the plane 146.
  • the other reflecting surfaces 144b to 144l forming the rotating mirror 144 have the same configuration as the reflecting surface 144a.
  • the diffusion angle of the laser light reflected by the convex curved surfaces 145 on both sides is larger than the diffusion angle of the laser light reflected by the central plane 146.
  • the scanning speed of the laser light forming the central region of each of the lines LA2 to LF2 is equal to the scanning speed of the laser light forming the side region of each of the lines LA2 to LF2. It is slower than the scanning speed. Therefore, according to the rotating mirror 144, similarly to the light distribution pattern P2 of FIG.
  • the luminous intensity of the central region Lwa in each of the lines LA2 to LF2 is reduced by the side region Lwb of each of the lines LA2 to LF2. Higher than the luminosity.
  • the output control of the light source 32 is easy and the light use efficiency can be improved.
  • FIG. 12 is a diagram illustrating a configuration of a rotating mirror 154 according to a second modification
  • FIG. 13 is a diagram illustrating a configuration of one reflection surface 154a of the rotating mirror 154.
  • the rotating mirror 154 includes a plurality of (for example, 12) reflecting surfaces 154a to 154l arranged in parallel along the rotation direction D, similarly to the rotating mirror 134 shown in FIG. I have.
  • the reflection surfaces 154a to 154l are configured such that the curvature of the reflection surface in the rotation direction D of the rotating mirror 154 changes at each reflection surface.
  • the reflection surface 154a includes two concave curved surfaces 155 and one flat surface 156.
  • the plane 156 is disposed at the center of the reflection surface 154a in the rotation direction D.
  • the two concave curved surfaces 155 are arranged on both sides of the plane 156 so as to sandwich the plane 156 in the rotation direction D.
  • the two concave curved surfaces 155 and the plane 156 sandwiched therebetween are formed so as to be continuously connected.
  • the concave curved surface 155 is formed as a curved reflective surface that is concave toward the rotation axis R (see FIG. 12).
  • a length xa2 on a straight line connecting the ends of the two concave curved surfaces 155 that is, a straight line connecting the left end of the left concave curved surface 155 and the right end of the right concave curved surface 155 in FIG.
  • the degree of curvature of the curved surface 155 is set so that the laser light emitted from the light source 32 to each concave curved surface 155 is reflected toward the phosphor 38 at a predetermined diffusion angle.
  • the length xb2 of the plane 156 on a straight line connecting both ends of the plane 156 is set so that the laser beam emitted from the light source 32 to the plane 156 is reflected toward the phosphor 38 at a predetermined diffusion angle. I have.
  • the length xa2 of the concave curved surface 155 is set to be longer than the length xb2 of the plane 156.
  • the other reflecting surfaces 154b to 154l constituting the rotating mirror 154 have the same configuration as the reflecting surface 154a.
  • FIG. 14 is a diagram in which the light distribution pattern P3 formed in front of the vehicle by the rotating mirror 154 is observed from the vehicle side.
  • the light distribution pattern P3 is formed by light that is divided into a plurality of stages (six in this example) and scanned in lines (LA3 to LF3).
  • the rotating mirror 154 having such a configuration, the laser light reflected on the concave curved surfaces 155 on both sides travels so as to be focused as compared with the laser light reflected on the plane 156 at the center. Therefore, in the scanning direction of the light distribution pattern P3 formed by the reflected light, the scanning speed of the light forming the side area of each of the lines LA3 to LF3 is the scanning speed of the light forming the central area of each of the lines LA3 to LF3. Slower than speed. Therefore, according to the rotating mirror 154, as shown in FIG. 14, when forming the light distribution pattern P3, the luminous intensity of both side regions (regions indicated by oblique lines in FIG. 14) of each of the lines LA3 to LF3 is changed to each line LA3. It can be made higher than the luminous intensity of the central region of LF3. Further, according to the rotating mirror 154, similarly to the rotating mirror 134, the output control of the light source 32 is easy and the light use efficiency can be improved.
  • FIG. 15 is a diagram illustrating a configuration of a rotating mirror 164 according to a third modification
  • FIG. 16 is a diagram illustrating a configuration of one reflection surface 164a of the rotating mirror 164.
  • the rotating mirror 164 includes a plurality of (for example, 12) reflecting surfaces 164a to 164l arranged in parallel along the rotation direction D, similarly to the rotating mirror 134 shown in FIG. I have.
  • the reflecting surfaces 164a to 164l are configured such that the curvature of the reflecting surface in the rotation direction D of the rotating mirror 164 changes at each reflecting surface.
  • the reflection surface 164a is composed of two flat surfaces 165 and one convex curved surface 166.
  • the convex curved surface 166 is disposed at the center of the reflection surface 164a in the rotation direction D.
  • the two flat surfaces 165 are arranged on both sides of the convex curved surface 166 so as to sandwich the convex curved surface 166 in the rotation direction D.
  • the two flat surfaces 165 and the convex curved surface 166 sandwiched therebetween are formed so as to be continuously connected.
  • the two planes 165 are formed so as to be inclined upward toward the convex curved surface 166 side (the center of the reflection surface 164a).
  • the convex curved surface 166 is formed as a curved reflective surface that protrudes outward from the rotating mirror 164.
  • a length xa3 on a straight line connecting the ends of the two planes 165, that is, a straight line connecting the left end of the left plane 165 and the right end of the right plane 165 in FIG. 16, and the inclination of the plane 165 with respect to the straight line The angle is set such that the laser beam emitted from the light source 32 to each plane 165 is reflected toward the phosphor 38 at a predetermined diffusion angle.
  • the length xb3 of the convex curved surface 166 on a straight line connecting both ends of the convex curved surface 166, and the degree of curvature of the convex curved surface 166 are determined by the laser light emitted from the light source 32 to the convex curved surface 166. Is set to be reflected toward the phosphor 38 at a predetermined diffusion angle. For example, the length xa3 of the plane 165 is set to be longer than the length xb3 of the plane 156.
  • the other reflecting surfaces 164b to 164l constituting the rotating mirror 164 have the same configuration as the reflecting surface 164a.
  • the diffusion angle of the laser light reflected by the convex curved surface 166 at the center is larger than the diffusion angle of the laser light reflected by the flat surfaces 165 on both sides.
  • the scanning speed of the light forming the side region of each line is lower than the scanning speed of the light forming the central region of each line. Therefore, according to the rotating mirror 164, similarly to the light distribution pattern P3 of FIG. 14 formed by the rotating mirror 154, the luminous intensity of both side regions (regions indicated by oblique lines) in each line (LA3 to LF3) is calculated. Can be higher than the luminous intensity of the central region of Further, according to the rotating mirror 164, similarly to the rotating mirror 134, the output control of the light source 32 is easy and the light use efficiency can be improved.
  • the reflecting surfaces having the same configuration are arranged diagonally, and the inclination angles of both reflecting surfaces on the diagonal are the same. It is not limited to this combination.
  • a reflection surface composed of two planes 135 and one concave curved surface 136 in the first embodiment and a reflection surface composed of two convex curved surfaces 145 and one plane 146 in the first modification.
  • the surfaces may be arranged diagonally, and the inclination angles of both reflecting surfaces may be the same.
  • a reflection surface composed of two concave curved surfaces 155 and one flat surface 156 in the second modification and a reflection surface composed of two planes 165 and one convex curved surface 166 in the third modification.
  • the surfaces may be arranged diagonally, and the inclination angles of both reflecting surfaces may be the same.
  • the reflecting surfaces in the first embodiment and the first to third modifications may be arranged in other combinations.
  • each reflecting surface is constituted by a plane and a concave curved surface, or a plane and a convex curved surface, but is not limited to this combination.
  • the central region of each reflecting surface may be configured with a concave curved surface, and the both side regions may be configured with a convex curved surface.
  • the central region of each reflecting surface may be formed by a convex curved surface, and the both side regions may be formed by a concave curved surface.
  • a dodecahedral rotating mirror is used in a top view, and light reflected by a pair of reflecting surfaces arranged diagonally forms the same line in the light distribution pattern.
  • the present invention is not limited to this example.
  • one line may be formed by light reflected on one reflection surface.
  • the rotating mirror is formed as a hexahedron in a top view, and has six reflecting surfaces along the rotating direction.
  • FIG. 17 shows a lamp unit 530 according to a fourth modification.
  • a rotating mirror (rotating reflector) 500 of a blade scan (registered trademark) method may be used instead of the polygon mirror 134 used in the above embodiment.
  • the rotating mirror 500 includes a plurality of (three in FIG. 17) blades 501a and a cylindrical rotating part 501b. Each blade 501a is provided around the rotating part 501b and functions as a reflecting surface.
  • the rotating mirror 500 is arranged so that its rotation axis R is oblique to the optical axis Ax.
  • the blade 501a has a shape twisted such that the angle formed between the optical axis Ax and the reflection surface changes in the circumferential direction around the rotation axis R.
  • scanning using light from the light source 32 can be performed.
  • each blade 501a is configured such that the curvature of the reflection surface in the rotation direction of the rotating mirror 500 changes.
  • the reflecting surface of each blade 501a is formed to have the same shape as the reflecting surface of the rotating mirror illustrated in any one of FIGS. 8, 11, 13, and 16. Even when such a rotating mirror 500 is used, as in the above-described embodiment, the light scanning speed changes in accordance with the change in the curvature, so that a part of the light distribution pattern can be made brighter than the other parts. It becomes possible.
  • the lamp unit is described as being mounted on the vehicle headlamp, but is not limited to this example.
  • the optical unit including the light source and the rotating mirror as described above can also be applied to components of a sensor unit (for example, a laser radar or LiDAR) mounted on a vehicle. Also in this case, by configuring so that the curvature in the rotation direction of the rotating mirror changes at each reflection surface of the rotating mirror, it is possible to improve the sensor sensitivity of a specific area in the sensor target range.
  • FIG. 18 shows a top view of a lamp unit 230 according to the second embodiment.
  • the lamp unit 230 includes a light source 32, a rotating mirror 234, a plano-convex lens 36, and a phosphor 38.
  • the rotating mirror 234 of the lamp unit 230 has a plurality of (eight in this example) reflecting surfaces 234a to 234h arranged in parallel along the rotating direction D.
  • the reflecting surfaces 234a to 234h of the rotating mirror 234 are all formed in a plane in this example.
  • the reflecting surfaces 234a to 234h are formed such that the lengths of the respective reflecting surfaces along the rotation direction D are the same.
  • the shape of the reflection surface is not limited to a flat surface, and may be, for example, a convex curved surface, a concave curved surface, or the like.
  • the angle between each of the reflection surfaces 234a to 234f and the optical axis Ax is formed differently, and the angle between the reflection surface 234g and the optical axis Ax is defined as the angle between the reflection surface 234c and the optical axis Ax.
  • the angle formed by the reflection surface 234h and the optical axis Ax is the same as the angle formed by the reflection surface 234d and the optical axis Ax (FIGS. 4 and 5). reference).
  • the angle formed between each of the reflecting surfaces 234a to 234f and the optical axis Ax is slightly smaller than the angle formed between the reflecting surface 234b and the optical axis Ax. It is formed as follows. Similarly, the reflection surface 234c, the reflection surface 234d, the reflection surface 234e, and the reflection surface 234f are formed in this order so that the angle formed between each reflection surface and the optical axis Ax becomes smaller.
  • the light reflected by one of the reflecting surfaces 234a to 234f is applied to a position different from the other reflecting surfaces in the vertical direction in front of the vehicle. For example, the light reflected by the reflecting surface 234b is irradiated above the light reflected by the reflecting surface 234a.
  • the light reflected by the reflecting surface 234c is irradiated above the light reflected by the reflecting surface 234b. Further, the light reflected by the reflecting surface 234d is irradiated above the light reflected by the reflecting surface 234c. Further, the light reflected by the reflecting surface 234e is irradiated above the light reflected by the reflecting surface 234d. Further, the light reflected by the reflecting surface 234f is irradiated above the light reflected by the reflecting surface 234e.
  • the light reflected by the reflecting surface 234g is irradiated in the same direction as the light reflected by the reflecting surface 234c having the same angle with the optical axis Ax.
  • the light reflected by the reflection surface 234h is irradiated in the same direction as the light reflected by the reflection surface 234d having the same angle with the optical axis Ax.
  • FIG. 19 shows a light distribution pattern P4 formed in front of the vehicle by the lamp unit 230.
  • the light distribution pattern P4 includes a plurality of lines (LA4 to LH4) formed by the laser light emitted from the light source 32.
  • the laser light emitted from the light source 32 is reflected by each of the reflecting surfaces 234a to 234h of the rotating mirror 234, and passes through the plano-convex lens 36 via the phosphor 38.
  • the rear focal point of the plano-convex lens 36 is set near the light emitting surface of the phosphor 38, so that the light image on the light emitting surface of the phosphor 38 is inverted upside down and irradiated forward.
  • the laser light is scanned in a line by being divided into a plurality of stages by the displacement of the light reflection direction due to the rotation of the rotating mirror 234.
  • the light reflected by the reflection surface 234a forms the lowermost line LA4 of the light distribution pattern P4 shown in FIG.
  • a line LB4 is formed above the line LA4 by the light reflected by the reflection surface 234b.
  • the line LC4 is formed above the line LB4 by the light reflected by the reflection surface 234c.
  • a line LD4 is formed above the line LC4 by the light reflected by the reflection surface 234d.
  • a line LE4 is formed above the line LD4 by the light reflected by the reflection surface 234e.
  • a line LF4 is formed above the line LE4 by the light reflected by the reflection surface 234f.
  • a line LG4 is formed overlapping with the line LC4 by the light reflected by the reflection surface 234g.
  • the line LH4 is formed overlapping with the line LD4 by the light reflected by the reflection surface 234h.
  • the lines at the lower center of the light distribution pattern P4 in the vertical direction are the light reflected by the reflection surface 234c and the light reflected by the reflection surface 234g. Is configured to scan twice. Further, a line at the upper center in the vertical direction of the light distribution pattern P4 (lines LD4 and LH4 corresponding to the third stage from the top) is twice formed by the light reflected by the reflection surface 234d and the light reflected by the reflection surface 234h. It is configured to be scanned. In addition, the line scanned repeatedly can be an arbitrary line in the light distribution pattern P4 by setting an angle between the reflection surface and the optical axis Ax.
  • the lamp unit 230 scans some lines in the vertical direction of the light distribution pattern P4 by light reflected on at least two of the plurality of reflecting surfaces 234a to 234h of the rotating mirror 234. It is configured to be able to.
  • the light distribution pattern P4 is disposed between the lines LF4, LE4, LB4, and LA4 (an example of a first line) and between the lines LF4 and LE4 and the lines LB4 and LA4 (an example of a first line).
  • Lines LD4 (LH4) and LC4 (LG4) an example of a second line).
  • the laser beams reflected by the two reflecting surfaces 234d and 234h of the rotating mirror 234 form the same line LD4 (LH4), and the laser beams reflected by the two reflecting surfaces 234c and 234g are the same.
  • LH4 line LD4
  • LG4 line LC4
  • the octahedral rotating mirror 234 is used in a top view, but is not limited to this example. It is sufficient that at least two of the angles formed by each reflection surface and the optical axis Ax are the same. For example, a light distribution pattern is formed by six lines as shown in FIG. In this case, a rotating mirror having seven or more reflecting surfaces may be used.
  • FIG. 20 is a top view of a lamp unit 330 according to the fifth modification.
  • the lamp unit 330 includes a light source 32, a rotating mirror 334, a plano-convex lens 36, and a phosphor 38.
  • the rotating mirror 334 of the lamp unit 330 has a plurality (eight in this example) of reflecting surfaces 334a to 334h arranged in parallel along the rotating direction D.
  • the reflecting surfaces 334a to 334h of the rotating mirror 334 are all formed in a plane in this example.
  • the reflecting surface 334e of the reflecting surfaces 334a to 334h is formed such that the length (surface width) of the surface along the rotation direction D is shorter than the other reflecting surfaces.
  • an angle formed between the reflecting surface 334e having a short surface width and the optical axis Ax is set to be the same as an angle formed between the reflecting surface 334d adjacent to the reflecting surface 334e and the optical axis Ax. Have been. Thereby, the light reflected by the reflecting surface 334d and the light reflected by the reflecting surface 334e are irradiated on the same line.
  • FIG. 21 is a top view of a lamp unit 430 according to the sixth modification.
  • the lamp unit 430 includes a light source 32, a rotating mirror 434, a plano-convex lens 36, and a phosphor 38.
  • the rotating mirror 434 of the lamp unit 430 has a plurality of (eight in this example) reflecting surfaces 434a to 434h arranged in parallel along the rotating direction D.
  • the reflecting surface 434e of the reflecting surfaces 434a to 434h of the rotating mirror 434 is formed as a concave curved surface that is recessed toward the rotation axis R.
  • the reflecting surfaces 434a to 434d and 434f to 434h other than the reflecting surface 434e are all formed in a planar shape.
  • the light reflected by the concave reflecting surface 434e is converged in the left-right direction as compared with the light reflected by the planar reflecting surfaces 434a to 434d and 434f to 434h.
  • an angle formed between the reflecting surface 434e having a short surface width and the optical axis Ax is set to be the same as an angle formed between the reflecting surface 434d adjacent to the reflecting surface 434e and the optical axis Ax. Have been. Thereby, the light reflected by the reflection surface 434d and the light reflected by the reflection surface 434e are irradiated on the same line.
  • FIG. 22 is a schematic diagram illustrating an example of a light distribution pattern P5 according to a fifth modification and a sixth modification of the second embodiment.
  • the light distribution pattern P5 overlaps the lines LH5, LG5, LF5, LD5, LC5, LB5, and LA5 on the same line as the line LD5 and in the central region of the line LD5 in the left-right direction.
  • the line LE5 formed.
  • the surface width of the reflection surface 334e for forming the line LE5 is set shorter than the surface width of the other reflection surfaces, the length of the line LE5 in the left-right direction is set. Is shorter than the length of the line LD5 or the like.
  • the reflecting surface 434e for forming the line LE5 is formed as a concave curved surface, the light reflected by the reflecting surface 434e is collected in the left-right direction.
  • the length of the line LE5 in the left-right direction is shorter than the length of the line LD5 or the like.
  • the luminous intensity of a partial area of the light distribution pattern is higher than the luminous intensity of the other area.
  • the line LE5 is formed so as to overlap the central region of the line LD5, but the range (position, size, shape, etc.) of the overlapping portion of the line is not limited to this example. .
  • the luminous intensity of a desired region of the light distribution pattern can be changed as appropriate.
  • a blade scan type rotation mirror 500 may be used (see FIG. 17). Also in the rotating mirror 500 of FIG. 17, the light reflected by at least two blades 501a of the plurality of blades 501a can scan a part of lines in the vertical direction of the light distribution pattern so as to overlap. By doing so, the luminous intensity of some regions of the light distribution pattern can be higher than the luminous intensity of other regions, as in the second embodiment.
  • the lamp unit is described as being mounted on the vehicle headlamp, but is not limited to this example.
  • the optical unit including the light source and the rotating mirror as described above can also be applied to components of a sensor unit (for example, a laser radar or LiDAR) mounted on a vehicle. Also in this case, since the light reflected by at least two of the plurality of reflecting surfaces of the rotating mirror is configured to irradiate the same range, the sensor sensitivity in a specific region of the sensor target range is adjusted. Can be improved.
  • the high beam lamp unit 630 As shown in FIG. 23, the high beam lamp unit 630 according to the third embodiment is disposed in front of the rotating mirror 34 with the light source 632, the rotating mirror 34 as a reflector (an example of a first mirror).
  • an arranged mirror 35 (an example of a second mirror).
  • the lamp unit 630 according to the third embodiment is different from the lamp unit 30 according to the reference embodiment in that the lamp unit 630 further includes a mirror 35 and that a light source 632 is provided instead of the light source 32.
  • the light source 632 has the same function as the light source 32.
  • the light source 32 according to the reference embodiment is disposed in front of the rotating mirror 34, whereas the light source 632 according to the third embodiment is disposed obliquely behind the rotating mirror 34.
  • the mirror 35 is disposed before the rotation axis R of the rotation mirror 34 and after the phosphor 38 in the front-rear direction.
  • the mirror 35 is arranged on the left front of the rotating mirror 34.
  • the surface facing the rotating mirror 34 is a reflection surface.
  • the mirror 35 is disposed at a position where the laser beam reflected by the rotating mirror 34 shines.
  • FIG. 24 is a top view of the optical unit according to the third embodiment.
  • the laser light emitted from the light source 632 hits the reflecting surface 34a of the rotating mirror 34.
  • the laser light is reflected by the reflection surface 34a and goes straight toward the mirror 35.
  • the laser light reflected by the reflecting surface 34a hits the reflecting surface of the mirror 35, the laser light is reflected by the reflecting surface of the mirror 35, and the reflected laser light goes straight toward the phosphor 38.
  • the scanning range on the phosphor 38 at this time is S2. Thereafter, the laser beam passes through the plano-convex lens 36 via the phosphor 38.
  • the length of the optical path from the reflecting surface 34a to the mirror 35 is D1
  • the length of the optical path from the reflecting surface of the mirror 35 to the phosphor 38 is D2
  • the length of the optical path from the reflecting surface 34a to the phosphor 38 is This is the length obtained by adding D2 to D1.
  • the light source 32 is disposed between the rotating mirror 34 and the phosphor 38 as in the reference embodiment.
  • the laser light is emitted from the light source 32
  • the laser light is reflected by the reflection surface closest to the phosphor 38 among the reflection surfaces 34a to 34l.
  • the laser light reflected by the reflecting surface goes straight toward the phosphor 38.
  • the length of the optical path from the reflecting surface of the rotating mirror 34 to the phosphor 38 is D3, and the scanning range on the phosphor 38 is S1.
  • the light reflected by each of the reflecting surfaces 34a to 34l of the rotating mirror 34 and transmitted through the plano-convex lens 36 via the phosphor 38 is transmitted to a predetermined position in front of the vehicle (for example, the vehicle).
  • a light distribution pattern P6 as shown in FIG. 25 is formed on the virtual vertical screen (25 m ahead). Specifically, the lowermost line LA6 of the light distribution pattern P6 shown in FIG. 25 is formed by the light reflected by the first pair of reflection surfaces 34A (reflection surfaces 34a and 34g). Further, a line LB6 is formed above the line LA6 by the light reflected by the second pair of reflection surfaces 34B (the reflection surfaces 34b and 34h).
  • the line LC6 is formed above the line LB6 by the light reflected by the third pair of reflecting surfaces 34C (the reflecting surfaces 34c and 34i).
  • the line LD6 is formed above the line LC6 by the light reflected by the fourth reflecting surface pair 34D (the reflecting surfaces 34d and 34j).
  • the line LE6 is formed above the line LD6 by the light reflected by the fifth reflection surface pair 34E (the reflection surfaces 34e and 34k).
  • the line LF6 is formed above the line LE6 by the light reflected by the sixth reflection surface pair 34F (the reflection surfaces 34f and 34l). As described above, the light reflection direction is changed by the rotation of the rotating mirror 34, so that the light is divided into a plurality of stages and scanned in a line to form the light distribution pattern P6.
  • the high beam lamp unit 730 As shown in FIG. 26, the high beam lamp unit 730 according to the fourth embodiment is disposed in front of the light source 732, the rotating mirror 34 as a reflector (an example of a first mirror), and the rotating mirror 34.
  • Mirror 735 (an example of a second mirror).
  • the lamp unit 730 according to the third embodiment is different from the lamp unit 730 according to the third embodiment in that a lamp 730 is further provided instead of the mirror 35 and a light source 732 is provided instead of the light source 632. And different.
  • the light source 732 has the same function as the light sources 32 and 632.
  • the light source 732 is arranged on the left front of the rotating mirror 34 and toward the lower side.
  • the light exit of the light source 732 is slightly upward from the light exits of the light source 32 and the light source 632.
  • the mirror 735 is disposed above the rotating mirror 34 between the rotating mirror 34 and the phosphor 38 in the front-rear direction. Of the surfaces of the mirror 735, the surface facing the rotating mirror 34 is a reflection surface. The mirror 735 is arranged at a position where the laser light reflected by the rotating mirror 34 shines.
  • FIG. 27 is a side view of a lamp unit 730 according to the fourth embodiment.
  • the laser light emitted from the light source 732 impinges on the reflecting surface 34a of the rotating mirror 34.
  • the laser light is reflected by the reflection surface 34a and travels straight to the mirror 735.
  • the laser light reflected by the reflection surface 34a hits the reflection surface of the mirror 735, the laser light is reflected by the reflection surface of the mirror 735, and the reflected laser light goes straight toward the phosphor 38.
  • the scanning range at this time is S3. Thereafter, the laser beam passes through the plano-convex lens 36 via the phosphor 38.
  • the length of the optical path from the reflecting surface 34a to the mirror 735 is D4 and the length of the optical path from the mirror 735 to the phosphor 38 is D5
  • the length of the optical path from the reflecting surface 34a to the phosphor 38 is D5. Length.
  • the light source 32 is disposed between the rotating mirror 34 and the phosphor 38 as in the reference embodiment (the light source 32 is indicated by a broken line in FIG. 27).
  • the laser light is reflected by the reflection surface closest to the phosphor 38 among the reflection surfaces 34a to 34l.
  • the laser light reflected by the reflecting surface goes straight toward the phosphor 38.
  • the length of the optical path from the reflecting surface of the rotating mirror 34 to the phosphor 38 is D3.
  • the scanning range on the phosphor 38 is S1.
  • the light reflected by each of the reflecting surfaces 34a to 34l of the rotating mirror 34 and transmitted through the phosphor 38 through the plano-convex lens 36 is at a predetermined position in front of the vehicle (for example, in the vehicle).
  • a light distribution pattern P7 as shown in FIG. 28 is formed on the virtual vertical screen (25 m ahead). Specifically, the light reflected by the first pair of reflection surfaces 34A (reflection surfaces 34a and 34g) forms the lowermost line LA7 of the light distribution pattern P7 shown in FIG. Further, a line LB7 is formed above the line LA7 by the light reflected by the second pair of reflection surfaces 34B (the reflection surfaces 34b and 34h).
  • a line LC7 is formed above the line LB7 by the light reflected by the third pair of reflection surfaces 34C (the reflection surfaces 34c and 34i).
  • the line LD7 is formed above the line LC7 by the light reflected by the fourth reflection surface pair 34D (reflection surfaces 34d and 34j).
  • the line LE7 is formed above the line LD7 by the light reflected by the fifth reflection surface pair 34E (the reflection surfaces 34e and 34k).
  • a line LF7 is formed above the line LE7 by the light reflected by the sixth reflecting surface pair 34F (the reflecting surfaces 34f and 34l).
  • the light reflected by the rotating mirror 34 (an example of the first mirror) is further reflected by the mirror 35 (an example of the second mirror). Therefore, the optical path from the reflecting surfaces 34a to 34l to the phosphor 38 can be made longer than when the light is reflected only by the reflecting surfaces 34a to 34l of the rotating mirror 34. Thus, the size of the optical unit can be reduced.
  • the laser light is emitted by the rotating mirror 34 and the mirrors 35 and 735, respectively. Since the laser light is reflected, the optical path from the reflecting surfaces 34a to 34l of the rotating mirror 34 to the light emitting surface (projection lens 36 or clear cover) of the optical unit is longer than when the laser light is reflected only by the rotating mirror 34. Become. Therefore, the optical unit can be reduced in size while preventing the diffusion width of the light distribution pattern from being reduced.
  • FIG. 29 shows a lamp unit 830 according to the fifth embodiment.
  • a rotating mirror 500 of a blade scan system may be used instead of the polygon mirror 34 used in the third and fourth embodiments.
  • the laser light emitted from the light source 632 hits the blade 501a of the rotating mirror 500.
  • the laser light is reflected by the blade 501a and travels straight toward the mirror 35.
  • the laser light reflected by the blade 501a hits the reflection surface of the mirror 35, the laser light is reflected by the reflection surface of the mirror 35, and the reflected laser light goes straight toward the phosphor 38. Therefore, also in the fifth embodiment, the optical path from the blade 501a to the phosphor 38 can be lengthened. Thus, the size of the optical unit can be reduced.
  • the boundary surface between the reflecting surfaces 34a to 34l of the rotating mirror 34 is discontinuous, but is not limited to this example.
  • the boundary surface between the reflection surfaces 34a to 34l may be a continuous surface.
  • the dodecahedral rotating mirror 34 is used when viewed from above, the light reflected by the pair of reflecting surfaces arranged diagonally forms the same line in the light distribution pattern.
  • the present invention is not limited to this example.
  • one line may be formed by light reflected by one reflection surface.
  • the rotating mirror is formed as a hexahedron in a top view, and has six reflecting surfaces along the rotating direction.
  • the lamp unit is described as being mounted on the vehicle headlamp, but is not limited to this example.
  • the optical unit including the light source and the rotating mirror as described above can be applied to components of a sensor unit (for example, a laser radar, a LiDAR, a visible light camera, an infrared camera, etc.) mounted on a vehicle. .
  • the present invention has been described with reference to the above embodiments.
  • the present invention is not limited to the above embodiments, and the configurations of the embodiments are appropriately combined or replaced. These are also included in the present invention. Further, it is also possible to appropriately change the combination and the order of processing in each embodiment based on the knowledge of those skilled in the art, and to add various modifications such as design changes to each embodiment. An embodiment to which is added can also be included in the scope of the present invention.

Abstract

A light shining device (130) comprises a light source (32), and a rotatable mirror (134) that reflects light emitted from the light source (32). The rotation of the mirror (134) displaces the reflection direction of the light emitted from the light source (42), whereby the light is split into a plurality of levels, is scanned in a line shape, and forms a light distribution pattern. The mirror (134) is structured from at least one reflective surface (134a), and is structured such that the curvature in the rotation direction of the mirror (134) changes at the at least one reflective surface (134a).

Description

光照射装置Light irradiation device
　本発明は、光照射装置に関する。 The present invention relates to a light irradiation device.
　近年、光源から出射した光を車両前方に反射し、その反射光で車両前方の領域を走査することで所定の配光パターンを形成する装置が考案されている。例えば、発光素子からなる複数の光源と、回転軸を中心に一方向に回転しながら複数の光源から出射した光を反射面において反射して所望の配光パターンを形成するブレードスキャン（登録商標）方式の回転リフレクタと、を備えた光学ユニットが知られている（特許文献１参照）。当該光学ユニットにおいて、複数の光源は、各光源から出射した光が回転リフレクタの反射面の異なる位置で反射するように配置されている。 In recent years, an apparatus has been devised that reflects light emitted from a light source toward the front of a vehicle and scans an area in front of the vehicle with the reflected light to form a predetermined light distribution pattern. For example, a plurality of light sources composed of light emitting elements, and a blade scan (registered trademark) that forms a desired light distribution pattern by reflecting light emitted from the plurality of light sources on a reflecting surface while rotating in one direction around a rotation axis. 2. Description of the Related Art There is known an optical unit including a rotating reflector of a system (see Patent Document 1). In the optical unit, the plurality of light sources are arranged so that light emitted from each light source is reflected at different positions on the reflection surface of the rotary reflector.
日本国特開２０１５－２６６２８号公報Japanese Patent Application Laid-Open No. 2015-26628
　回転リフレクタに代えて、ポリゴンミラーを用いる光学ユニットも知られている。このような光学ユニットにおいて、配光パターンの制御には改善の余地がある。 光学 An optical unit that uses a polygon mirror instead of a rotating reflector is also known. In such an optical unit, there is room for improvement in controlling the light distribution pattern.
　また、ポリゴンミラーを用いる光学ユニットは小型化が進んでいる。それに伴い、ポリゴンミラーと光学ユニットから光が出る面（光出射面）との間隔も狭まってきている。その結果、配光パターンの拡散幅が狭くなる。このようなポリゴンミラーを備えた光照射装置は、この点で改善の余地がある。 光学 In addition, optical units using polygon mirrors are becoming smaller. Accordingly, the distance between the polygon mirror and a surface from which light is emitted from the optical unit (light emitting surface) is also becoming narrower. As a result, the diffusion width of the light distribution pattern is reduced. The light irradiation device provided with such a polygon mirror has room for improvement in this respect.
　そこで、本発明は、配光パターンの一部を他の部分よりも明るくする、すなわち、配光パターンの少なくとも一部の光度を高めることが可能な光照射装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a light irradiation device that can make a part of a light distribution pattern brighter than other parts, that is, can increase the luminous intensity of at least a part of the light distribution pattern.
　また、本発明は、配光パターンの拡散幅を狭めることなく、光学ユニットを小型化することができる光照射装置を提供することを目的とする。 Another object of the present invention is to provide a light irradiation device that can reduce the size of an optical unit without reducing the diffusion width of a light distribution pattern.
　上記課題を解決するために、本発明に係る光照射装置は、
　光源と、
　前記光源から出射された光を反射させる回転可能なミラーと、
を備え、
　前記ミラーの回転によって前記光の反射方向が変位することで、前記光が複数の段に分かれてライン状に走査されて配光パターンを形成する、光照射装置であって、
　前記ミラーは少なくとも一つの反射面から構成され、当該少なくとも一つの反射面において前記ミラーの回転方向における曲率が変化するように構成されている。 In order to solve the above problems, a light irradiation device according to the present invention is:
Light source,
A rotatable mirror that reflects light emitted from the light source,
With
A light irradiating device, wherein the light is divided into a plurality of stages and scanned in a line to form a light distribution pattern by displacing the reflection direction of the light by rotation of the mirror,
The mirror includes at least one reflection surface, and the curvature in the rotation direction of the mirror changes at the at least one reflection surface.
　上記構成によれば、曲率の変化に応じて光の走査速度が変化するため、配光パターンの一部を他の部分よりも明るくすることが可能となる。また、配光パターンの一部を他の部分よりも明るくするために光源の出力を変化させる必要がなく、光源の出力制御が容易となる。 According to the above configuration, since the scanning speed of light changes according to the change in curvature, it is possible to make a part of the light distribution pattern brighter than other parts. Further, it is not necessary to change the output of the light source in order to make a part of the light distribution pattern brighter than the other parts, so that the output control of the light source becomes easy.
　また、本発明に係る光照射装置において、
　前記光の走査方向における前記ラインの中央領域を形成するための前記光の走査速度が、前記中央領域以外の領域を形成するための前記光の走査速度よりも遅くなるように、前記曲率が設定されていてもよい。 Further, in the light irradiation device according to the present invention,
The curvature is set such that the scanning speed of the light for forming the central region of the line in the scanning direction of the light is lower than the scanning speed of the light for forming the region other than the central region. It may be.
　上記構成によれば、光の走査方向におけるラインの中央領域の光度を他の領域の光度よりも高くすることができる。 According to the above configuration, the luminous intensity of the central region of the line in the light scanning direction can be higher than the luminous intensity of the other regions.
　また、本発明に係る光照射装置において、
　前記少なくとも一つの反射面は、前記回転方向において平面と凸状または凹状の湾曲面とから構成されていてもよい。 Further, in the light irradiation device according to the present invention,
The at least one reflecting surface may include a flat surface and a convex or concave curved surface in the rotation direction.
　上記構成によれば、簡便な構成で、配光パターンの一部を他の部分よりも明るくすることができる。 According to the above configuration, a part of the light distribution pattern can be made brighter than other parts with a simple configuration.
　上記課題を解決するために、本発明に係る光照射装置は、
　光源と、
　前記光源から出射された光を反射させる回転可能なミラーと、
を備え、
　前記ミラーの回転によって前記光の反射方向が変位することで、前記光が複数の段に分かれてライン状に走査されて配光パターンを形成する、光照射装置であって、
　前記ミラーは、前記ミラーの回転方向に沿って配置された複数の反射面を有し、
　前記複数の反射面は、前記配光パターンの少なくとも一部を構成する同一のライン上で前記光の少なくとも一部が重複するように構成されている。 In order to solve the above problems, a light irradiation device according to the present invention is:
Light source,
A rotatable mirror that reflects light emitted from the light source,
With
A light irradiating device, wherein the light is divided into a plurality of stages and scanned in a line to form a light distribution pattern by displacing the reflection direction of the light by rotation of the mirror,
The mirror has a plurality of reflection surfaces arranged along a rotation direction of the mirror,
The plurality of reflecting surfaces are configured such that at least a part of the light overlaps on the same line that forms at least a part of the light distribution pattern.
　上記構成によれば、同一のライン上で光が重複することで、配光パターンの少なくとも一部の光度を高めることができる。 According to the configuration described above, the luminous intensity of at least a part of the light distribution pattern can be increased by overlapping the light on the same line.
　前記複数の反射面のうち少なくとも二つの反射面で反射された前記光が前記配光パターンの少なくとも一部を構成する同一のラインを形成してもよい。 The light reflected by at least two of the plurality of reflecting surfaces may form the same line that forms at least a part of the light distribution pattern.
　上記構成によれば、複数の反射面で同一のラインを形成するため、配光パターンの少なくとも一部の光度を高めることができる。 According to the above configuration, since the same line is formed by the plurality of reflection surfaces, the luminous intensity of at least a part of the light distribution pattern can be increased.
　また、本発明に係る光照射装置において、
　前記配光パターンは、複数の第一のラインと、前記複数の第一のラインの間に配置された第二のラインとを含み、
　前記少なくとも二つの反射面は、前記少なくとも二つの反射面で反射された前記光が前記第二のラインを形成するように、構成されていてもよい。 Further, in the light irradiation device according to the present invention,
The light distribution pattern includes a plurality of first lines, and a second line disposed between the plurality of first lines,
The at least two reflecting surfaces may be configured such that the light reflected by the at least two reflecting surfaces forms the second line.
　上記構成によれば、配光パターンのうち中央部の光度を高めることができる。 According to the above configuration, the luminous intensity at the center of the light distribution pattern can be increased.
　上記課題を解決するために、本発明に係る光照射装置は、
　光源と、
　前記光源から出射された光を反射させる回転可能な第一のミラーと、
を備え、
　前記第一のミラーの回転によって前記光の反射方向が変位することで、前記光が複数の段に分かれてライン状に走査される、光照射装置であって、
　前記第一のミラーにより反射された光を反射させる第二のミラーをさらに備えている。 In order to solve the above problems, a light irradiation device according to the present invention is:
Light source,
A rotatable first mirror that reflects light emitted from the light source,
With
A light irradiation device, wherein the light is divided into a plurality of stages and scanned in a line by the displacement of the reflection direction of the light by rotation of the first mirror,
The apparatus further includes a second mirror that reflects light reflected by the first mirror.
　上記構成に係る光照射装置によれば、第一のミラーで反射された光は、第二のミラーによってさらに反射される。このため、光が第一のミラーでのみ反射される場合と比べて、第一のミラーの反射面から当該光照射装置の光出射面までの光路が長くなる。
　このように、上記構成によれば、配光パターンの拡散幅が狭まってしまうことを防ぎつつ、光学ユニットを小型化させることができる。 According to the light irradiation device having the above configuration, the light reflected by the first mirror is further reflected by the second mirror. For this reason, the optical path from the reflection surface of the first mirror to the light emission surface of the light irradiation device is longer than when the light is reflected only by the first mirror.
Thus, according to the above configuration, it is possible to reduce the size of the optical unit while preventing the diffusion width of the light distribution pattern from being reduced.
　また、本発明に係る光照射装置は、
　前記第二のミラーにより反射された光を透過する光学部材をさらに備えてもよい。 Further, the light irradiation device according to the present invention,
The optical device may further include an optical member that transmits light reflected by the second mirror.
　また、本発明に係る光照射装置において、
　前記光学部材は、蛍光体と投影レンズとを含み、
　前記蛍光体は、前記第一のミラーと前記投影レンズとの間に配置され、
　前記第二のミラーにより反射された光は、前記蛍光体上に走査され、
　前記蛍光体から出射された光は、前記投影レンズを透過して出射される。 Further, in the light irradiation device according to the present invention,
The optical member includes a phosphor and a projection lens,
The phosphor is disposed between the first mirror and the projection lens,
The light reflected by the second mirror is scanned on the phosphor,
Light emitted from the phosphor is transmitted through the projection lens and emitted.
　上記構成に係る光照射装置によれば、光が第一のミラーでのみ反射される場合と比べて、第一のミラーの反射面から蛍光体までの光路を長くすることができる。それにより、光学ユニットを小型化することができる。 According to the light irradiation device having the above configuration, the optical path from the reflection surface of the first mirror to the phosphor can be made longer than when the light is reflected only by the first mirror. Thus, the size of the optical unit can be reduced.
　また、本発明に係る光照射装置において、
　前記ミラーは、ポリゴンミラーとして構成されていてもよい。 Further, in the light irradiation device according to the present invention,
The mirror may be configured as a polygon mirror.
　前記ミラーとしては、ポリゴンミラーを用いることが好ましい。 ポ リ ゴ ン It is preferable to use a polygon mirror as the mirror.
　本発明によれば、配光パターンの一部を他の部分よりも明るくする、すなわち配光パターンの少なくとも一部の光度を高めることが可能な光照射装置を提供することができる。 According to the present invention, it is possible to provide a light irradiation device that can make a part of the light distribution pattern brighter than other parts, that is, can increase the luminous intensity of at least a part of the light distribution pattern.
　また、本発明によれば、配光パターンの拡散幅を狭めることなく、光学ユニットを小型化することができる光照射装置を提供することができる。 According to the present invention, it is possible to provide a light irradiation device that can reduce the size of the optical unit without reducing the diffusion width of the light distribution pattern.
車両用前照灯の水平断面図である。It is a horizontal sectional view of a vehicle headlamp. 参考実施形態に係る光学ユニットの構成を模式的に示した斜視図である。It is the perspective view which showed typically the structure of the optical unit which concerns on a reference embodiment. 図２の光学ユニットの上面図である。FIG. 3 is a top view of the optical unit in FIG. 2. 図２の光学ユニットの側面図である。FIG. 3 is a side view of the optical unit in FIG. 2. 図４の光学ユニットにおいて回転ミラーが回転した状態を示す側面図である。FIG. 5 is a side view illustrating a state where a rotating mirror is rotated in the optical unit of FIG. 4. 図２の光学ユニットにより車両前方に形成される配光パターンの一例を示す模式図である。FIG. 3 is a schematic diagram illustrating an example of a light distribution pattern formed in front of a vehicle by the optical unit in FIG. 2. 第一実施形態に係る光学ユニットの上面図である。FIG. 3 is a top view of the optical unit according to the first embodiment. 図７の光学ユニットにおける回転ミラーの一つの反射面を示す拡大図である。FIG. 8 is an enlarged view showing one reflection surface of a rotating mirror in the optical unit of FIG. 7. 図７の光学ユニットにより車両前方に形成される配光パターンの一例を示す模式図である。FIG. 8 is a schematic diagram illustrating an example of a light distribution pattern formed in front of a vehicle by the optical unit in FIG. 7. 第一変形例に係る回転ミラーを示す図である。FIG. 10 is a diagram illustrating a rotating mirror according to a first modification. 第一変形例の回転ミラーの一つの反射面を示す図である。It is a figure showing one reflective surface of a rotation mirror of the first modification. 第二変形例に係る回転ミラーを示す図である。FIG. 14 is a diagram illustrating a rotating mirror according to a second modification. 第二変形例の回転ミラーの一つの反射面を示す図である。It is a figure showing one reflective surface of a rotation mirror of the second modification. 図１２の回転ミラーを備えた光学ユニットにより車両前方に形成される配光パターンの一例を示す模式図である。FIG. 13 is a schematic diagram illustrating an example of a light distribution pattern formed in front of a vehicle by an optical unit including the rotating mirror in FIG. 12. 第三変形例に係る回転ミラーを示す図である。FIG. 14 is a diagram illustrating a rotating mirror according to a third modification. 第三変形例の回転ミラーの一つの反射面を示す図である。It is a figure showing one reflective surface of a rotation mirror of the third modification. 第四変形例に係る光学ユニットの側面図である。It is a side view of the optical unit concerning a 4th modification. 第二実施形態に係る光学ユニットの上面図である。It is a top view of the optical unit concerning a second embodiment. 図１８の光学ユニットにより車両前方に形成される配光パターンの一例を示す模式図である。FIG. 19 is a schematic diagram illustrating an example of a light distribution pattern formed in front of the vehicle by the optical unit in FIG. 18. 第五変形例に係る光学ユニットの上面図である。It is a top view of the optical unit concerning a 5th modification. 第六変形例に係る光学ユニットの上面図である。It is a top view of the optical unit concerning a 6th modification. 第五変形例および第六変形例に係る配光パターンの一例を示す模式図である。It is a schematic diagram which shows an example of the light distribution pattern which concerns on a 5th modification and a 6th modification. 第三実施形態に係る光学ユニットの構成を模式的に示した斜視図である。It is the perspective view which showed typically the structure of the optical unit which concerns on 3rd embodiment. 図２３の光学ユニットの上面図である。FIG. 24 is a top view of the optical unit of FIG. 23. 図２３の光学ユニットにより車両前方に形成される配光パターンの一例を示す模式図である。FIG. 24 is a schematic diagram illustrating an example of a light distribution pattern formed in front of the vehicle by the optical unit of FIG. 23. 第四実施形態に係る光学ユニットの構成を模式的に示した斜視図である。It is a perspective view showing typically composition of an optical unit concerning a 4th embodiment. 図２６の光学ユニットの側面図である。FIG. 27 is a side view of the optical unit of FIG. 26. 図２６の光学ユニットにより車両前方に形成される配光パターンの一例を示す模式図である。FIG. 27 is a schematic diagram illustrating an example of a light distribution pattern formed in front of the vehicle by the optical unit of FIG. 26. 第五実施形態に係る光学ユニットの上面図である。It is a top view of the optical unit concerning a 5th embodiment.
　以下、本発明を実施の形態をもとに図面を参照しながら説明する。各図面に示される同一または同等の構成要素、部材、処理には、同一の符号を付するものとし、適宜重複した説明は省略する。また、実施の形態は、発明を限定するものではなく例示であって、実施の形態に記述される全ての特徴やその組合せは、必ずしも発明の本質的なものであるとは限らない。 Hereinafter, the present invention will be described based on embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing are denoted by the same reference numerals, and the repeated description will be omitted as appropriate. In addition, the embodiments do not limit the invention, but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.
　なお、本実施形態における、「左右方向」、「前後方向」、「上下方向」とは、図１に示す車両用前照灯について、説明の便宜上、設定された相対的な方向である。「前後方向」とは、「前方向」および「後方向」を含む方向である。「左右方向」とは、「左方向」および「右方向」を含む方向である。「上下方向」とは、「上方向」および「下方向」を含む方向である。 Note that, in the present embodiment, the “left-right direction”, “front-back direction”, and “up-down direction” are relative directions set for the vehicle headlight shown in FIG. 1 for convenience of description. The “front-back direction” is a direction including the “front direction” and the “back direction”. The “left-right direction” is a direction including “left direction” and “right direction”. The “vertical direction” is a direction including “upward” and “downward”.
　本発明の光学ユニット（光照射装置の一例）は、種々の車両用灯具に用いることができる。はじめに、後述する各実施形態に係る光学ユニットを搭載可能な車両用前照灯の概略について説明する。 The optical unit (an example of a light irradiation device) of the present invention can be used for various vehicle lamps. First, an outline of a vehicle headlamp on which an optical unit according to each embodiment described later can be mounted will be described.
［車両用前照灯］
　図１は、車両用前照灯の水平断面図である。図２は、図１の車両用前照灯に搭載された光学ユニットの構成を模式的に示した斜視図である。図３は、光学ユニットの上面図であり、図４および５は光学ユニットの側面図である。 [Vehicle headlights]
FIG. 1 is a horizontal sectional view of a vehicle headlamp. FIG. 2 is a perspective view schematically showing a configuration of an optical unit mounted on the vehicle headlight of FIG. FIG. 3 is a top view of the optical unit, and FIGS. 4 and 5 are side views of the optical unit.
　図１に示す車両用前照灯１０は、自動車の前端部の右側に搭載される右側前照灯であり、左側に搭載される前照灯と左右対称である以外は同じ構造である。そのため、以下では、右側の車両用前照灯１０について詳述し、左側の車両用前照灯については説明を省略する。 The vehicle headlamp 10 shown in FIG. 1 is a right headlamp mounted on the right side of the front end of the vehicle, and has the same structure as the headlamp mounted on the left side except that it is symmetrical. Therefore, hereinafter, the right vehicle headlamp 10 will be described in detail, and the description of the left vehicle headlamp will be omitted.
　図１に示すように、車両用前照灯１０は、前方に向かって開口した凹部を有するランプボディ１２を備えている。ランプボディ１２は、その前面開口が透明な前面カバー１４によって覆われて灯室１６が形成されている。灯室１６は、２つのランプユニット２０，３０が車幅方向に並んで配置された状態で収容される空間として機能する。 As shown in FIG. 1, the vehicle headlamp 10 includes a lamp body 12 having a concave portion that opens forward. The lamp body 12 has a front opening covered with a transparent front cover 14 to form a lamp chamber 16. The light room 16 functions as a space in which the two lamp units 20 and 30 are housed in a state of being arranged side by side in the vehicle width direction.
　これらランプユニット２０，３０のうち車幅方向の内側、すなわち、右側の車両用前照灯１０において図１に示す下側に配置されたランプユニット２０は、ロービームを照射するように構成されている。一方、これらランプユニット２０，３０のうち車幅方向の外側、すなわち、右側の車両用前照灯１０において図１に示す上側に配置されたランプユニット３０は、レンズ３６を備えたランプユニットであり、可変ハイビームを照射するように構成されている。 Among these lamp units 20, 30, the lamp unit 20 arranged inside the vehicle width direction, that is, the lower side shown in FIG. 1 in the right vehicle headlamp 10, is configured to emit a low beam. . On the other hand, among the lamp units 20 and 30, the lamp unit 30 disposed outside in the vehicle width direction, that is, the upper side shown in FIG. 1 of the right vehicle headlamp 10 is a lamp unit having a lens 36. , And a variable high beam.
　ロービーム用のランプユニット２０は、リフレクタ２２と、例えばＬＥＤからなる光源２４とを有している。リフレクタ２２およびＬＥＤ光源２４は、図示しない既知の手段、例えば、エイミングスクリューとナットを使用した手段によりランプボディ１２に対して傾動自在に支持されている。 ラ ン プ The low beam lamp unit 20 has a reflector 22 and a light source 24 made of, for example, an LED. The reflector 22 and the LED light source 24 are tiltably supported with respect to the lamp body 12 by known means (not shown), for example, means using an aiming screw and a nut.
（参考実施形態）
　参考実施形態に係るハイビーム用のランプユニット３０は、図２～図５に示すように、光源３２と、リフレクタとしての回転ミラー３４と、回転ミラー３４の前方に配置された投影レンズとしての平凸レンズ３６と、回転ミラー３４と平凸レンズ３６との間に配置された蛍光体３８と、を備えている。 (Reference embodiment)
As shown in FIGS. 2 to 5, the high beam lamp unit 30 according to the reference embodiment includes a light source 32, a rotating mirror 34 as a reflector, and a plano-convex lens as a projection lens disposed in front of the rotating mirror 34. 36, and a phosphor 38 disposed between the rotating mirror 34 and the plano-convex lens 36.
　光源３２としては、例えば、レーザ光源を用いることができる。レーザ光源の代わりに、ＬＥＤやＥＬ素子などの半導体発光素子を光源として用いることも可能である。光源３２は、不図示の光源制御部により、点消灯の制御が可能となっている。特に後述する配光パターンの制御には、点消灯が短時間に精度よく行える光源を用いることが好ましい。光源制御部は、例えば、少なくとも一つの電子制御ユニット（ＥＣＵ：Ｅｌｅｃｔｒｏｎｉｃ　Ｃｏｎｔｒｏｌ　Ｕｎｉｔ）により構成されている。電子制御ユニットは、１以上のプロセッサと１以上のメモリを含む少なくとも一つのマイクロコントローラと、トランジスタ等のアクティブ素子及びパッシブ素子を含むその他電子回路を含んでもよい。プロセッサは、例えば、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）、ＭＰＵ（Ｍｉｃｒｏ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）及び／又はＧＰＵ（Ｇｒａｐｈｉｃｓ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）である。メモリは、ＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）と、ＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）を含む。ＲＯＭには、ランプユニット３０の制御プログラムが記憶されてもよい。 レ ー ザ As the light source 32, for example, a laser light source can be used. Instead of a laser light source, a semiconductor light emitting element such as an LED or an EL element can be used as a light source. The light source 32 can be turned on and off by a light source control unit (not shown). In particular, for controlling a light distribution pattern described later, it is preferable to use a light source capable of turning on and off accurately in a short time. The light source control unit includes, for example, at least one electronic control unit (ECU: Electronic Control Unit). The electronic control unit may include at least one microcontroller including one or more processors and one or more memories, and other electronic circuits including active elements such as transistors and passive elements. The processor is, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit) and / or a GPU (Graphics Processing Unit). The memory includes a ROM (Read Only Memory) and a RAM (Random Access Memory). The control program of the lamp unit 30 may be stored in the ROM.
　平凸レンズ３６の形状は、要求される配光パターンや照度分布などの配光特性に応じて適宜選択すればよいが、非球面レンズや自由曲面レンズが用いられる。平凸レンズ３６の後方焦点は、例えば、蛍光体３８の光出射面近傍に設定される。これにより、蛍光体３８の光出射面の光像が上下反転して前方へ照射されることになる。 The shape of the plano-convex lens 36 may be appropriately selected according to the light distribution characteristics such as a required light distribution pattern and illuminance distribution, and an aspheric lens or a free-form surface lens is used. The rear focus of the plano-convex lens 36 is set, for example, near the light emitting surface of the phosphor 38. As a result, the light image on the light emitting surface of the phosphor 38 is turned upside down and is irradiated forward.
　蛍光体３８は、例えば、光源３２から出射された青色レーザ光で励起されることによって黄色光を発する蛍光体粉末が混合された樹脂材料により構成されている。青色レーザ光と黄色蛍光が混色して蛍光体３８から出射されたレーザ光は白色光となる。 The phosphor 38 is made of, for example, a resin material mixed with phosphor powder that emits yellow light when excited by blue laser light emitted from the light source 32. The laser light emitted from the phosphor 38 by mixing the blue laser light and the yellow fluorescent light becomes white light.
　回転ミラー３４は、駆動源としてのモータ４０に回転自在に接続されている。回転ミラー３４は、モータ４０により回転軸Ｒを中心に回転方向Ｄに回転する。回転ミラー３４の回転軸Ｒは、光軸Ａｘに対して斜めになっている（図４参照）。回転ミラー３４は、回転方向Ｄに沿って配置された複数（本例では１２面）の反射面３４ａ～３４ｌから構成されている。回転ミラー３４の各反射面３４ａ～３４ｌは、光源３２から出射した光を回転しながら反射する。これにより、図４に示すように光源３２の光を用いた走査が可能となる。回転ミラー３４は、例えば、１２面の反射面を多角形状に構成したポリゴンミラーである。 The rotating mirror 34 is rotatably connected to a motor 40 as a driving source. The rotating mirror 34 is rotated by a motor 40 in a rotation direction D about a rotation axis R. The rotation axis R of the rotation mirror 34 is oblique to the optical axis Ax (see FIG. 4). The rotating mirror 34 includes a plurality of (12 in this example) reflecting surfaces 34a to 34l arranged along the rotating direction D. The reflecting surfaces 34a to 34l of the rotating mirror 34 reflect the light emitted from the light source 32 while rotating. This enables scanning using light from the light source 32 as shown in FIG. The rotating mirror 34 is, for example, a polygon mirror in which twelve reflecting surfaces are formed in a polygonal shape.
　ここで、反射面３４ａ～３４ｈのうち、反射面３４ａと、当該反射面３４ａと対角線上の反対側に位置する反射面３４ｇとを、第一反射面対３４Ａとする。反射面３４ｂと、当該反射面３４ｂと対角線上の反対側に位置する反射面３４ｈとを、第二反射面対３４Ｂとする。反射面３４ｃと、当該反射面３４ｃと対角線上の反対側に位置する反射面３４ｉとを、第三反射面対３４Ｃとする。反射面３４ｄと、当該反射面３４ｄと対角線上の反対側に位置する反射面３４ｊとを、第四反射面対３４Ｄとする。反射面３４ｅと、当該反射面３４ｅと対角線上の反対側に位置する反射面３４ｋとを、第五反射面対３４Ｅとする。反射面３４ｆと、当該反射面３４ｆと対角線上の反対側に位置する反射面３４ｌとを、第六反射面対３４Ｆとする。 Here, among the reflecting surfaces 34a to 34h, the reflecting surface 34a and the reflecting surface 34g located on the diagonally opposite side of the reflecting surface 34a are referred to as a first reflecting surface pair 34A. The reflecting surface 34b and the reflecting surface 34h located on the diagonally opposite side of the reflecting surface 34b are defined as a second reflecting surface pair 34B. The reflecting surface 34c and the reflecting surface 34i located on the diagonally opposite side of the reflecting surface 34c are defined as a third reflecting surface pair 34C. The reflecting surface 34d and the reflecting surface 34j on the diagonally opposite side of the reflecting surface 34d are defined as a fourth reflecting surface pair 34D. The reflecting surface 34e and the reflecting surface 34k located on the diagonally opposite side of the reflecting surface 34e are referred to as a fifth reflecting surface pair 34E. The reflecting surface 34f and the reflecting surface 341 located on the diagonally opposite side of the reflecting surface 34f are referred to as a sixth reflecting surface pair 34F.
　第一反射面対３４Ａは、光源３２からのレーザ光が反射面３４ａで反射されるときの（すなわち、図３および図４に示すような配置関係の場合の）上下方向および前後方向からなる面における反射面３４ａと光軸Ａｘとの成す角θａと、光源３２からのレーザ光が反射面３４ｇで反射されるときの上下方向および前後方向からなる面における反射面３４ｇと光軸Ａｘとの成す角が略同一となるように形成されている。同様に、第二反射面対３４Ｂは、光源３２からのレーザ光が反射面３４ｂで反射されるときの（すなわち、図５に示すような配置関係の場合の）上下方向および前後方向からなる面における反射面３４ｂと光軸Ａｘとの成す角θｂと、光源３２からのレーザ光が反射面３４ｈで反射されるときの上下方向および前後方向からなる面における反射面３４ｈと光軸Ａｘとの成す角が略同一となるように形成されている。第三反射面対３４Ｃは、光源３２からのレーザ光が反射面３４ｃで反射されるときの反射面３４ｃと光軸Ａｘとの成す角と、光源３２からのレーザ光が反射面３４ｉで反射されるときの反射面３４ｉと光軸Ａｘとの成す角が略同一となるように形成されている。第四反射面対３４Ｄは、光源３２からのレーザ光が反射面３４ｄで反射されるときの反射面３４ｄと光軸Ａｘとの成す角と、光源３２からのレーザ光が反射面３４ｊで反射されるときの反射面３４ｊと光軸Ａｘとの成す角が略同一となるように形成されている。第五反射面対３４Ｅは、光源３２からのレーザ光が反射面３４ｅで反射されるときの反射面３４ｅと光軸Ａｘとの成す角と、光源３２からのレーザ光が反射面３４ｋで反射されるときの反射面３４ｋと光軸Ａｘとの成す角が略同一となるように形成されている。第六反射面対３４Ｆは、光源３２からのレーザ光が反射面３４ｆ，３４ｌと光軸Ａｘとの成す角が互いに略同一となるように形成されている。すなわち、回転ミラー３４の各反射面３４ａ～３４ｌは、対角線上にある一対の反射面同士が同じ角度の傾斜面となるように形成されている。これにより、第一反射面対３４Ａ～第六反射面対３４Ｆをそれぞれ構成する一対の反射面により反射された光は、車両前方の上下方向において略同一の位置に照射される。また、回転ミラー３４がモータ４０により回転方向Ｄに回転する際の回転ミラー３４のブレを防止することができる。 The first reflecting surface pair 34A is a surface formed in the up-down direction and the front-back direction when the laser light from the light source 32 is reflected by the reflecting surface 34a (that is, in the case of the arrangement shown in FIGS. 3 and 4). , The angle θa between the reflecting surface 34a and the optical axis Ax, and the angle between the reflecting surface 34g and the optical axis Ax in the vertical and front-back directions when the laser light from the light source 32 is reflected by the reflecting surface 34g. The corners are formed to be substantially the same. Similarly, the second reflecting surface pair 34B is a surface formed in the up-down direction and the front-back direction when the laser light from the light source 32 is reflected by the reflecting surface 34b (that is, in the case of the arrangement shown in FIG. 5). , The angle θb between the reflecting surface 34b and the optical axis Ax, and the angle between the reflecting surface 34h and the optical axis Ax in the vertical and front-back directions when the laser light from the light source 32 is reflected by the reflecting surface 34h. The corners are formed to be substantially the same. The third pair of reflecting surfaces 34C includes an angle formed between the reflecting surface 34c and the optical axis Ax when the laser light from the light source 32 is reflected by the reflecting surface 34c, and the laser light from the light source 32 is reflected by the reflecting surface 34i. The angle formed between the reflecting surface 34i and the optical axis Ax at the time of reflection is substantially the same. The fourth reflecting surface pair 34D is formed by an angle between the reflecting surface 34d and the optical axis Ax when the laser light from the light source 32 is reflected by the reflecting surface 34d, and the laser light from the light source 32 is reflected by the reflecting surface 34j. The angle formed between the reflection surface 34j and the optical axis Ax at the time of reflection is substantially the same. The fifth reflection surface pair 34E is formed by an angle between the reflection surface 34e and the optical axis Ax when the laser light from the light source 32 is reflected by the reflection surface 34e, and the laser light from the light source 32 is reflected by the reflection surface 34k. The angle formed between the reflection surface 34k and the optical axis Ax at the time of reflection is substantially the same. The sixth reflection surface pair 34F is formed such that the angles formed by the reflection surfaces 34f and 34l and the optical axis Ax by the laser light from the light source 32 are substantially the same. That is, each of the reflecting surfaces 34a to 34l of the rotating mirror 34 is formed such that a pair of diagonal reflecting surfaces are inclined surfaces having the same angle. Accordingly, the light reflected by the pair of reflecting surfaces constituting the first reflecting surface pair 34A to the sixth reflecting surface pair 34F is applied to substantially the same position in the vertical direction in front of the vehicle. Further, it is possible to prevent the rotation of the rotating mirror 34 when the rotating mirror 34 is rotated in the rotation direction D by the motor 40.
　また、光源３２からのレーザ光が第一反射面対３４Ａで反射されるときの当該第一反射面対３４Ａと光軸Ａｘとの成す角θａは、光源３２からのレーザ光が他の反射面対３４Ｂ～３４Ｆで反射されるときの他の反射面対３４Ｂ～３４Ｆの各反射面と光軸Ａｘとの成す角とは異なるように形成されている。例えば、図５に示す反射面３４ｂと光軸Ａｘとの成す角θｂは、図４に示す反射面３４ａと光軸Ａｘとの成す角θａよりもやや小さくなるように形成されている。同様に、第二反射面対３４Ｂ、第三反射面対３４Ｃ、第四反射面対３４Ｄ、第五反射面対３４Ｅ、第六反射面対３４Ｆの順で、各反射面対と光軸Ａｘとの成す角が小さくなるように形成されている。これにより、一の反射面対により反射された光は、車両前方の上下方向において他の反射面対とは異なる位置に照射される。例えば、反射面３４ｂにより反射された光Ｌｂは、車両前方の仮想鉛直スクリーン上において反射面３４ａにより反射された光Ｌａよりも上方に照射される。 When the laser light from the light source 32 is reflected by the first reflecting surface pair 34A, the angle θa between the first reflecting surface pair 34A and the optical axis Ax is determined by the angle θa between the laser light from the light source 32 and the other reflecting surface. The angles formed by the respective reflection surfaces of the other reflection surface pairs 34B to 34F and the optical axis Ax when reflected by the pairs 34B to 34F are different from each other. For example, the angle θb between the reflection surface 34b and the optical axis Ax shown in FIG. 5 is formed to be slightly smaller than the angle θa between the reflection surface 34a and the optical axis Ax shown in FIG. Similarly, in the order of the second reflecting surface pair 34B, the third reflecting surface pair 34C, the fourth reflecting surface pair 34D, the fifth reflecting surface pair 34E, and the sixth reflecting surface pair 34F, each reflecting surface pair and the optical axis Ax Are formed so that the angle formed by them becomes smaller. As a result, the light reflected by one pair of reflecting surfaces is applied to a position different from that of the other pair of reflecting surfaces in the vertical direction in front of the vehicle. For example, the light Lb reflected by the reflection surface 34b is irradiated above the light La reflected by the reflection surface 34a on the virtual vertical screen in front of the vehicle.
　上記のように構成された回転ミラー３４の各反射面３４ａ～３４ｌにより反射されて蛍光体３８を介して平凸レンズ３６を透過した光は、車両前方の所定位置（例えば、車両の２５ｍ前方）の仮想鉛直スクリーン上において図６に示すような配光パターンＰ１を形成する。具体的には、第一反射面対３４Ａ（反射面３４ａ，３４ｇ）で反射された光により、図６に示す配光パターンＰ１のうち最下部のラインＬＡ１が形成される。また、第二反射面対３４Ｂ（反射面３４ｂ，３４ｈ）で反射された光により、ラインＬＡ１の上側にラインＬＢ１が形成される。第三反射面対３４Ｃ（反射面３４ｃ，３４ｉ）で反射された光により、ラインＬＢ１の上側にラインＬＣ１が形成される。第四反射面対３４Ｄ（反射面３４ｄ，３４ｊ）で反射された光により、ラインＬＣ１の上側にラインＬＤ１が形成される。第五反射面対３４Ｅ（反射面３４ｅ，３４ｋ）で反射された光により、ラインＬＤ１の上側にラインＬＥ１が形成される。第六反射面対３４Ｆ（反射面３４ｆ，３４ｌ）で反射された光により、ラインＬＥ１の上側にラインＬＦ１が形成される。このように、回転ミラー３４の回転によって光の反射方向が変位することで、光が複数の段に分かれてライン状に走査されて配光パターンＰ１が形成される。 The light reflected by each of the reflecting surfaces 34a to 34l of the rotating mirror 34 having the above-described configuration and transmitted through the plano-convex lens 36 via the phosphor 38 is at a predetermined position in front of the vehicle (for example, 25 m ahead of the vehicle). A light distribution pattern P1 as shown in FIG. 6 is formed on the virtual vertical screen. Specifically, the lowermost line LA1 of the light distribution pattern P1 shown in FIG. 6 is formed by the light reflected by the first reflection surface pair 34A (reflection surfaces 34a and 34g). Further, a line LB1 is formed above the line LA1 by the light reflected by the second pair of reflection surfaces 34B (the reflection surfaces 34b and 34h). The line LC1 is formed above the line LB1 by the light reflected by the third pair of reflection surfaces 34C (the reflection surfaces 34c and 34i). The line LD1 is formed above the line LC1 by the light reflected by the fourth reflection surface pair 34D (reflection surfaces 34d and 34j). The line LE1 is formed above the line LD1 by the light reflected by the fifth reflection surface pair 34E (the reflection surfaces 34e and 34k). The line LF1 is formed above the line LE1 by the light reflected by the sixth reflection surface pair 34F (the reflection surfaces 34f and 34l). As described above, the light reflection direction is changed by the rotation of the rotating mirror 34, so that the light is divided into a plurality of stages and scanned in a line to form the light distribution pattern P1.
　なお、各反射面３４ａ～３４ｌの間の境界で光源３２からのレーザ光が反射されると、レーザ光が散乱して不適切な配光が形成されるおそれがある。そのため、光源制御部は、各反射面３４ａ～３４ｌ間の境界と光源３２からのレーザ光の光線が交差するタイミングでは光源３２を消灯するように、光源３２の点消灯を制御することが好ましい。 If the laser light from the light source 32 is reflected at the boundary between the reflection surfaces 34a to 34l, the laser light may be scattered and an inappropriate light distribution may be formed. Therefore, it is preferable that the light source control unit controls the turning on and off of the light source 32 so that the light source 32 is turned off at the timing when the boundary between the respective reflection surfaces 34a to 34l and the laser beam from the light source 32 intersect.
　また、参考実施形態に係るランプユニット３０においては、備えている光源３２は比較的小さく、光源３２が配置されている位置も回転ミラー３４と平凸レンズ３６との間であって光軸Ａｘよりずれている。そのため、従来のプロジェクタ方式のランプユニットのように、光源とリフレクタとレンズとが光軸上に一列に配列されている場合と比較して、車両用前照灯１０の車両前後方向の長さを短くすることができる。 In the lamp unit 30 according to the reference embodiment, the light source 32 provided is relatively small, and the position where the light source 32 is disposed is also between the rotating mirror 34 and the plano-convex lens 36 and is shifted from the optical axis Ax. ing. Therefore, the length of the vehicle headlamp 10 in the vehicle front-rear direction is smaller than that in the case where the light source, the reflector, and the lens are arranged in a line on the optical axis as in a conventional projector type lamp unit. Can be shorter.
（第一実施形態）
　図７は、第一実施形態に係るランプユニット１３０の上面図を示す。図７に示すようにランプユニット１３０は、光源３２と、回転ミラー１３４と、平凸レンズ３６と、蛍光体３８と、を備えている。 (First embodiment)
FIG. 7 shows a top view of the lamp unit 130 according to the first embodiment. As shown in FIG. 7, the lamp unit 130 includes a light source 32, a rotating mirror 134, a plano-convex lens 36, and a phosphor 38.
　ランプユニット１３０の回転ミラー１３４は、回転方向Ｄに沿って並列して配置される複数（本例では１２面）の反射面１３４ａ～１３４ｌを備えている。回転ミラー１３４の反射面１３４ａ～１３４ｌは、各反射面において回転ミラー１３４の回転方向Ｄにおける反射面の曲率が変化するように構成されている。 The rotating mirror 134 of the lamp unit 130 has a plurality of (12 in this example) reflecting surfaces 134a to 134l arranged in parallel along the rotating direction D. The reflecting surfaces 134a to 134l of the rotating mirror 134 are configured such that the curvature of the reflecting surface in the rotation direction D of the rotating mirror 134 changes at each reflecting surface.
　図８は、回転ミラー１３４の反射面１３４ａ～１３４ｌのうちの一つの反射面、例えば、反射面１３４ａの構成を示す拡大図である。図８に示すように反射面１３４ａは、二つの平面１３５と一つの凹状湾曲面１３６とで構成されている。 FIG. 8 is an enlarged view showing the configuration of one of the reflecting surfaces 134a to 134l of the rotating mirror 134, for example, the reflecting surface 134a. As shown in FIG. 8, the reflection surface 134a is constituted by two flat surfaces 135 and one concave curved surface 136.
　凹状湾曲面１３６は、回転方向Ｄにおいて、反射面１３４ａの中央部に配置されている。二つの平面１３５は、回転方向Ｄにおいて、凹状湾曲面１３６を間に挟むように凹状湾曲面１３６の両側に配置されている。二つの平面１３５とその間に挟まれた凹状湾曲面１３６とは、連続的につながるように形成されている。 The concave curved surface 136 is disposed at the center of the reflecting surface 134a in the rotation direction D. The two planes 135 are arranged on both sides of the concave curved surface 136 so as to sandwich the concave curved surface 136 in the rotation direction D. The two flat surfaces 135 and the concave curved surface 136 interposed therebetween are formed so as to be continuously connected.
　二つの平面１３５は、凹状湾曲面１３６側（反射面１３４ａの中央）に向かって下り傾斜となるように形成されている。凹状湾曲面１３６は、回転軸Ｒ（図７参照）側に凹んだ湾曲反射面として形成されている。２つの平面１３５の端部同士を結ぶ直線、すなわち図８において左側の平面１３５の左端部と右側の平面１３５の右端部とを結ぶ直線上における各平面１３５の長さｘａ、および当該直線に対する各平面１３５の傾斜角度は、光源３２から各平面１３５へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。また、凹状湾曲面１３６の両端部を結ぶ直線上における凹状湾曲面１３６の長さｘｂ、および凹状湾曲面１３６の湾曲度は、光源３２から凹状湾曲面１３６へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。例えば、平面１３５の長さｘａは、凹状湾曲面１３６の長さｘｂよりも長くなるように設定されている。 The two planes 135 are formed so as to be inclined downward toward the concave curved surface 136 side (the center of the reflection surface 134a). The concave curved surface 136 is formed as a curved reflective surface concave toward the rotation axis R (see FIG. 7). The length xa of each plane 135 on a straight line connecting the ends of the two planes 135, that is, the straight line connecting the left end of the left plane 135 and the right end of the right plane 135 in FIG. The inclination angle of the plane 135 is set so that the laser beam emitted from the light source 32 to each plane 135 is reflected toward the phosphor 38 at a predetermined diffusion angle. The length xb of the concave curved surface 136 on a straight line connecting both end portions of the concave curved surface 136 and the degree of curvature of the concave curved surface 136 are determined by the laser light emitted from the light source 32 to the concave curved surface 136. Is set to be reflected at a predetermined diffusion angle toward. For example, the length xa of the plane 135 is set to be longer than the length xb of the concave curved surface 136.
　このような構成の反射面１３４ａによって反射されたレーザ光は、回転ミラー１３４の回転方向Ｄに沿った回転の速度が一定であるとすると、図７に示すように、ランプユニット１３０の左右方向において、例えば、拡散角度Ｗａｂだけ拡散する。このうち、凹状湾曲面１３６で反射されたレーザ光は、ランプユニット１３０の左右方向において、光軸Ａｘを中心として拡散角度Ｗａだけ拡散する。そして、二つの平面１３５で反射されたレーザ光は、ランプユニット１３０の左右方向において、凹状湾曲面１３６で反射されたレーザ光の両側にそれぞれ拡散角度Ｗｂずつ拡散する。 Assuming that the rotation speed of the rotating mirror 134 along the rotation direction D is constant, the laser light reflected by the reflecting surface 134a having such a configuration is, as shown in FIG. For example, the light is diffused by the diffusion angle Wab. Among them, the laser light reflected by the concave curved surface 136 is diffused in the left-right direction of the lamp unit 130 by the diffusion angle Wa about the optical axis Ax. Then, the laser light reflected on the two planes 135 is diffused by a diffusion angle Wb on both sides of the laser light reflected on the concave curved surface 136 in the left-right direction of the lamp unit 130.
　なお、回転ミラー１３４を構成する他の反射面１３４ｂ～１３４ｌは、反射面１３４ａと同じ構成を有するように形成されている。 The other reflecting surfaces 134b to 134l constituting the rotating mirror 134 are formed to have the same configuration as the reflecting surface 134a.
　光源３２から出射されたレーザ光が反射面１３４ａで反射されるときの当該反射面１３４ａと光軸Ａｘとの成す角は、光源３２から出射されたレーザ光が反射面１３４ｇで反射されるときの当該反射面１３４ｇと光軸Ａｘとの成す角と略同一となるように形成されている（図４，図５参照）。同様に、反射面１３４ｂと光軸Ａｘとの成す角は、反射面１３４ｈと光軸Ａｘとの成す角と略同一となるように形成されている。同様に、反射面１３４ｃと光軸Ａｘとの成す角は、反射面１３４ｉと光軸Ａｘとの成す角と略同一となるように形成されている。同様に、反射面１３４ｄと光軸Ａｘとの成す角は、反射面１３４ｊと光軸Ａｘとの成す角と略同一となるように形成されている。同様に、反射面１３４ｅと光軸Ａｘとの成す角は、反射面１３４ｋと光軸Ａｘとの成す角と略同一となるように形成されている。同様に、反射面１３４ｆと光軸Ａｘとの成す角は、反射面１３４ｌと光軸Ａｘとの成す角と略同一となるように形成されている。 The angle between the reflection surface 134a and the optical axis Ax when the laser light emitted from the light source 32 is reflected by the reflection surface 134a is determined when the laser light emitted from the light source 32 is reflected by the reflection surface 134g. It is formed so that the angle formed by the reflection surface 134g and the optical axis Ax is substantially the same (see FIGS. 4 and 5). Similarly, the angle formed between the reflection surface 134b and the optical axis Ax is formed to be substantially the same as the angle formed between the reflection surface 134h and the optical axis Ax. Similarly, the angle between the reflection surface 134c and the optical axis Ax is formed to be substantially the same as the angle between the reflection surface 134i and the optical axis Ax. Similarly, the angle formed between the reflection surface 134d and the optical axis Ax is formed to be substantially the same as the angle formed between the reflection surface 134j and the optical axis Ax. Similarly, the angle between the reflection surface 134e and the optical axis Ax is formed to be substantially the same as the angle between the reflection surface 134k and the optical axis Ax. Similarly, the angle between the reflection surface 134f and the optical axis Ax is formed to be substantially the same as the angle between the reflection surface 134l and the optical axis Ax.
　すなわち、回転ミラー１３４の反射面１３４ａ～１３４ｌは、参考実施形態と同様に、対角線上にある一対の反射面同士が同じ角度の傾斜面となるように形成されている。これにより、反射面１３４ａと反射面１３４ｇとで反射されたレーザ光は、車両前方の上下方向において略同一の位置に照射される。また、反射面１３４ｂと反射面１３４ｈとで反射されたレーザ光、反射面１３４ｃと反射面１３４ｉとで反射されたレーザ光、反射面１３４ｄと反射面１３４ｊとで反射されたレーザ光、反射面１３４ｅと反射面１３４ｋとで反射されたレーザ光、反射面１３４ｆと反射面１３４ｌとで反射されたレーザ光は、車両前方の上下方向において略同一の位置に照射される。 In other words, the reflecting surfaces 134a to 134l of the rotating mirror 134 are formed such that a pair of diagonal reflecting surfaces are inclined at the same angle as in the reference embodiment. As a result, the laser light reflected by the reflecting surfaces 134a and 134g is applied to substantially the same position in the vertical direction in front of the vehicle. In addition, laser light reflected by the reflecting surfaces 134b and 134h, laser light reflected by the reflecting surfaces 134c and 134i, laser light reflected by the reflecting surfaces 134d and 134j, and reflecting surface 134e The laser light reflected by the reflection surface 134k and the laser light reflected by the reflection surface 134f and the reflection surface 134l are applied to substantially the same position in the vertical direction in front of the vehicle.
　また、参考実施形態と同様に、一の反射面対と光軸Ａｘとの成す角は、他の反射面対と光軸Ａｘとの成す角とは異なるように形成されている。例えば、反射面１３４ｂおよび反射面１３４ｈと光軸Ａｘとの成す角は、反射面１３４ａおよび反射面１３４ｇと光軸Ａｘとの成す角よりもやや小さくなるように形成されている。同様に、反射面１３４ｃおよび反射面１３４ｉ、反射面１３４ｄおよび反射面１３４ｊ、反射面１３４ｅおよび反射面１３４ｋ、反射面１３４ｆおよび反射面１３４ｌの順で、各反射面対と光軸Ａｘとの成す角が小さくなるように形成されている。 Also, similarly to the reference embodiment, the angle formed between one reflection surface pair and the optical axis Ax is formed so as to be different from the angle formed between the other reflection surface pair and the optical axis Ax. For example, the angle formed between the reflection surfaces 134b and 134h and the optical axis Ax is formed to be slightly smaller than the angle formed between the reflection surfaces 134a and 134g and the optical axis Ax. Similarly, in the order of the reflecting surfaces 134c and 134i, the reflecting surfaces 134d and 134j, the reflecting surfaces 134e and 134k, the reflecting surfaces 134f and 134l, the angle formed between each reflecting surface pair and the optical axis Ax. Is formed to be small.
　これにより、一の反射面対により反射されたレーザ光は、車両前方の上下方向において他の反射面対により反射されたレーザ光とは異なる位置に照射される。例えば、反射面１３４ｂおよび反射面１３４ｈで反射されたレーザ光は、反射面１３４ａおよび反射面１３４ｇで反射されたレーザ光よりも上方に照射される。また、反射面１３４ｃおよび反射面１３４ｉで反射されたレーザ光は、反射面１３４ｂおよび反射面１３４ｈで反射された光よりも上方に照射される。 Thereby, the laser light reflected by one reflection surface pair is applied to a position different from the laser light reflected by the other reflection surface pair in the vertical direction in front of the vehicle. For example, the laser light reflected by the reflecting surfaces 134b and 134h is irradiated above the laser light reflected by the reflecting surfaces 134a and 134g. Further, the laser light reflected by the reflecting surfaces 134c and 134i is irradiated above the light reflected by the reflecting surfaces 134b and 134h.
　図９は、第一実施形態に係るランプユニット１３０により車両前方に形成される配光パターンＰ２を車両側から観察した図である。
　図９に示すように、配光パターンＰ２は、複数の段（本例では６段）に分かれてライン（ＬＡ２～ＬＦ２）状に走査されるレーザ光によって形成される。光源３２から出射されたレーザ光は、回転ミラー１３４の反射面１３４ａ～１３４ｌにより反射され、蛍光体３８を介して平凸レンズ３６を透過する。参考実施形態と同様に、平凸レンズ３６の後方焦点は蛍光体３８の光出射面近傍に設定されているため、蛍光体３８の光出射面の光像が上下反転して前方へ照射される。 FIG. 9 is a diagram in which a light distribution pattern P2 formed in front of the vehicle by the lamp unit 130 according to the first embodiment is observed from the vehicle side.
As shown in FIG. 9, the light distribution pattern P2 is formed by a laser beam that is divided into a plurality of stages (six in this example) and scanned in lines (LA2 to LF2). The laser light emitted from the light source 32 is reflected by the reflecting surfaces 134a to 134l of the rotating mirror 134, and passes through the plano-convex lens 36 via the phosphor 38. As in the reference embodiment, the rear focal point of the plano-convex lens 36 is set near the light emitting surface of the phosphor 38, so that the light image on the light emitting surface of the phosphor 38 is inverted upside down and irradiated forward.
　具体的には、反射面１３４ａで反射されたレーザ光により、図９に示す配光パターンＰ２のうち最下部の第一ラインＬＡ２が形成される。また、反射面１３４ｂで反射されたレーザ光により、第一ラインＬＡ２の上側に第二ラインＬＢ２が形成される。反射面１３４ｃで反射されたレーザ光により、第二ラインＬＢ２の上側に第三ラインＬＣ２が形成される。反射面１３４ｄで反射されたレーザ光により、第三ラインＬＣ２の上側に第四ラインＬＤ２が形成される。反射面１３４ｅで反射されたレーザ光により、第四ラインＬＤ２の上側に第五ラインＬＥ２が形成される。反射面１３４ｆで反射されたレーザ光により、第五ラインＬＥ２の上側に第六ラインＬＦ２が形成される。同様に、反射面１３４ｇ、１３４ｈ、１３４ｉ、１３４ｊ、１３４ｋ、１３４ｌで反射された光により、第一ラインＬＡ２、第二ラインＬＢ２、第三ラインＬＣ２、第四ラインＬＤ２、第五ラインＬＥ２、第六ラインＬＦ２がそれぞれ形成される。 {Specifically, the lowermost first line LA2 of the light distribution pattern P2 shown in FIG. 9 is formed by the laser light reflected by the reflection surface 134a. The second line LB2 is formed above the first line LA2 by the laser light reflected by the reflection surface 134b. The third line LC2 is formed above the second line LB2 by the laser light reflected by the reflection surface 134c. The fourth line LD2 is formed above the third line LC2 by the laser light reflected by the reflection surface 134d. The fifth line LE2 is formed above the fourth line LD2 by the laser beam reflected by the reflection surface 134e. The sixth line LF2 is formed above the fifth line LE2 by the laser beam reflected by the reflection surface 134f. Similarly, the first line LA2, the second line LB2, the third line LC2, the fourth line LD2, the fifth line LE2, and the sixth line are formed by the light reflected by the reflecting surfaces 134g, 134h, 134i, 134j, 134k, and 134l. Lines LF2 are respectively formed.
　ところで、参考実施形態のように反射面３４ａ～３４ｌが全て平面で構成されている回転ミラー３４を用いて配光パターンの一部を他の部分よりも明るくしようとする場合、例えば、光源から回転ミラーに向けて照射する光量を各反射面内で部分ごとに変化させるような光源の制御方法を採用することが考えられる。しかしながら、この方法では、反射面ごとに短いタイミングで頻繁に光源の出力を変化させなければならず制御が複雑となる。また、光源の出力を変化させる必要があり、光の利用効率が低下する場合がある。 By the way, when it is intended to make a part of the light distribution pattern brighter than the other parts by using the rotating mirror 34 in which the reflecting surfaces 34a to 34l are all flat as in the reference embodiment, for example, the light source is rotated from the light source. It is conceivable to adopt a light source control method in which the amount of light radiated toward the mirror is changed for each portion within each reflection surface. However, in this method, the output of the light source must be frequently changed at a short timing for each reflection surface, and the control becomes complicated. Further, it is necessary to change the output of the light source, and the light use efficiency may decrease.
　これに対して、上記第一実施形態に係るランプユニット１３０は、回転ミラー１３４の各反射面１３４ａ～１３４ｌにおいて回転ミラー１３４の回転方向Ｄにおける反射面の曲率が変化するように構成されている。具体的には、各反射面１３４ａ～１３４ｌは、反射面の中央部に配置される凹状湾曲面１３６と凹状湾曲面１３６を間に挟むように凹状湾曲面１３６の両側に配置される二つの平面１３５により構成されている。この構成によれば、中央部の凹状湾曲面１３６で反射されたレーザ光は、凹状湾曲面１３６の両側に配置される平面１３５で反射されたレーザ光と比較して中央方向（光軸Ａｘ側）に集光するように進行する。このため、回転ミラー１３４により反射された光により形成される配光パターンＰ２の走査方向において、各ライン（ＬＡ２～ＬＦ２）の中央領域を形成する光の走査速度は、各ラインの側部領域を形成する光の走査速度よりも遅くなる。よって、ランプユニット１３０によれば、図９に示すように、配光パターンＰ２を形成する際に、各ライン（ＬＡ２～ＬＦ２）における左右方向の中央領域（図９の斜線で示す領域）Ｌｗａの光度を各ラインの側部領域Ｌｗｂの光度よりも高くすることができる。 On the other hand, the lamp unit 130 according to the first embodiment is configured such that the curvature of the reflection surface in the rotation direction D of the rotation mirror 134 changes in each of the reflection surfaces 134a to 134l of the rotation mirror 134. Specifically, each of the reflecting surfaces 134a to 134l is formed by two flat surfaces disposed on both sides of the concave curved surface 136 so as to sandwich the concave curved surface 136 disposed at the center of the reflecting surface. 135. According to this configuration, the laser light reflected on the concave curved surface 136 at the central portion is compared with the laser light reflected on the plane 135 disposed on both sides of the concave curved surface 136 in the central direction (on the optical axis Ax side). ). For this reason, in the scanning direction of the light distribution pattern P2 formed by the light reflected by the rotating mirror 134, the scanning speed of the light forming the central region of each line (LA2 to LF2) depends on the side region of each line. It becomes slower than the scanning speed of the light to be formed. Therefore, according to the lamp unit 130, as shown in FIG. 9, when the light distribution pattern P2 is formed, the central region Lwa in the left and right direction (the region shown by oblique lines in FIG. 9) in each line (LA2 to LF2). The luminous intensity can be higher than the luminous intensity of the side region Lwb of each line.
　また、この構成によれば、配光パターンＰ２の一部（中央領域Ｌｗａ）を他の部分（側部領域Ｌｗｂ）よりも明るくするために光源３２の照射光量を変化させる必要がない。そのため、光源３２の出力制御が容易となる。さらに、各反射面１３４ａ～１３４ｌにレーザ光を照射させる際に光源３２から出射させるレーザ光の出射光量を低下させる必要がない。そのため、光の利用効率を向上させることができる。 According to this configuration, it is not necessary to change the irradiation light amount of the light source 32 in order to make a part (the central area Lwa) of the light distribution pattern P2 brighter than the other part (the side area Lwb). Therefore, output control of the light source 32 becomes easy. Further, it is not necessary to reduce the amount of laser light emitted from the light source 32 when irradiating each of the reflection surfaces 134a to 134l with laser light. Therefore, light use efficiency can be improved.
　次に、第一実施形態に係る回転ミラー１３４の変形例について説明する。
（第一変形例）
　図１０は、第一変形例に係る回転ミラー１４４の構成を示す図であり、図１１は、回転ミラー１４４の一つの反射面１４４ａの構成を示す図である。
　図１０に示すように、回転ミラー１４４は、図７に示す回転ミラー１３４と同様に、回転方向Ｄに沿って並列して配置される複数（例えば１２面）の反射面１４４ａ～１４４ｌを備えている。また、回転ミラー１４４の反射面１４４ａ～１４４ｌは、各反射面において回転ミラー１４４の回転方向Ｄにおける反射面の曲率が変化するように構成されている。 Next, a modified example of the rotating mirror 134 according to the first embodiment will be described.
(First modification)
FIG. 10 is a diagram illustrating a configuration of a rotating mirror 144 according to a first modification, and FIG. 11 is a diagram illustrating a configuration of one reflection surface 144a of the rotating mirror 144.
As shown in FIG. 10, the rotating mirror 144 includes a plurality of (for example, 12) reflecting surfaces 144a to 144l arranged in parallel along the rotation direction D, similarly to the rotating mirror 134 shown in FIG. I have. The reflecting surfaces 144a to 144l of the rotating mirror 144 are configured such that the curvature of the reflecting surface in the rotation direction D of the rotating mirror 144 changes at each reflecting surface.
　図１１に示すように、反射面１４４ａは、二つの凸状湾曲面１４５と一つの平面１４６とで構成されている。
　平面１４６は、回転方向Ｄにおいて、反射面１４４ａの中央部に配置されている。二つの凸状湾曲面１４５は、回転方向Ｄにおいて、平面１４６を間に挟むように平面１４６の両側に配置されている。二つの凸状湾曲面１４５とその間に挟まれた平面１４６とは、連続的につながるように形成されている。凸状湾曲面１４５は、回転ミラー１４４の外方向に突出する湾曲反射面として形成されている。二つの凸状湾曲面１４５の端部同士を結ぶ直線、すなわち、図１１において左側の凸状湾曲面１４５の左端部と右側の凸状湾曲面１４５の右端部とを結ぶ直線上における凸状湾曲面１４５の長さｘａ１、および凸状湾曲面１４５の湾曲度は、光源３２から各凸状湾曲面１４５へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。また、平面１４６の両端部を結ぶ直線上における平面１４６の長さｘｂ１は、光源３２から平面１４６へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。例えば、凸状湾曲面１４５の長さｘａ１は、平面１４６の長さｘｂ１よりも長くなるように設定されている。 As shown in FIG. 11, the reflection surface 144a is composed of two convex curved surfaces 145 and one flat surface 146.
The plane 146 is disposed at the center of the reflection surface 144a in the rotation direction D. The two convex curved surfaces 145 are arranged on both sides of the plane 146 so as to sandwich the plane 146 in the rotation direction D. The two convexly curved surfaces 145 and the plane 146 sandwiched therebetween are formed so as to be continuously connected. The convex curved surface 145 is formed as a curved reflective surface protruding outward from the rotating mirror 144. A convex curve on a straight line connecting the ends of the two convex curved surfaces 145, that is, a straight line connecting the left end of the left convex curved surface 145 and the right end of the right convex curved surface 145 in FIG. The length xa1 of the surface 145 and the degree of curvature of the convex curved surface 145 are set so that the laser light emitted from the light source 32 to each convex curved surface 145 is reflected toward the phosphor 38 at a predetermined diffusion angle. Have been. The length xb1 of the plane 146 on a straight line connecting both ends of the plane 146 is set so that the laser beam emitted from the light source 32 to the plane 146 is reflected toward the phosphor 38 at a predetermined diffusion angle. I have. For example, the length xa1 of the convex curved surface 145 is set to be longer than the length xb1 of the plane 146.
　なお、回転ミラー１４４を構成する他の反射面１４４ｂ～１４４ｌは、反射面１４４ａと同じ構成を有する。 The other reflecting surfaces 144b to 144l forming the rotating mirror 144 have the same configuration as the reflecting surface 144a.
　このような構成の回転ミラー１４４によれば、両側部の凸状湾曲面１４５で反射されたレーザ光の拡散角度は、中央部の平面１４６で反射されたレーザ光の拡散角度よりも大きくなるように構成されている。このため、反射光により形成される配光パターンの走査方向において、各ラインＬＡ２～ＬＦ２の中央領域を形成するレーザ光の走査速度は、各ラインＬＡ２～ＬＦ２の側部領域を形成するレーザ光の走査速度よりも遅くなる。よって、回転ミラー１４４によれば、上記回転ミラー１３４で形成される図９の配光パターンＰ２と同様に、各ラインＬＡ２～ＬＦ２における中央領域Ｌｗａの光度を各ラインＬＡ２～ＬＦ２の側部領域Ｌｗｂの光度よりも高くすることができる。
　また、回転ミラー１４４によれば、上記回転ミラー１３４と同様に、光源３２の出力制御が容易であり、且つ、光の利用効率を向上させることができる。 According to the rotating mirror 144 having such a configuration, the diffusion angle of the laser light reflected by the convex curved surfaces 145 on both sides is larger than the diffusion angle of the laser light reflected by the central plane 146. Is configured. Therefore, in the scanning direction of the light distribution pattern formed by the reflected light, the scanning speed of the laser light forming the central region of each of the lines LA2 to LF2 is equal to the scanning speed of the laser light forming the side region of each of the lines LA2 to LF2. It is slower than the scanning speed. Therefore, according to the rotating mirror 144, similarly to the light distribution pattern P2 of FIG. 9 formed by the rotating mirror 134, the luminous intensity of the central region Lwa in each of the lines LA2 to LF2 is reduced by the side region Lwb of each of the lines LA2 to LF2. Higher than the luminosity.
Further, according to the rotating mirror 144, similarly to the rotating mirror 134, the output control of the light source 32 is easy and the light use efficiency can be improved.
（第二変形例）
　図１２は、第二変形例に係る回転ミラー１５４の構成を示す図であり、図１３は、回転ミラー１５４の一つの反射面１５４ａの構成を示す図である。
　図１２に示すように、回転ミラー１５４は、図７に示す回転ミラー１３４と同様に、回転方向Ｄに沿って並列して配置される複数（例えば１２面）の反射面１５４ａ～１５４ｌを備えている。反射面１５４ａ～１５４ｌは、各反射面において回転ミラー１５４の回転方向Ｄにおける反射面の曲率が変化するように構成されている。 (Second modification)
FIG. 12 is a diagram illustrating a configuration of a rotating mirror 154 according to a second modification, and FIG. 13 is a diagram illustrating a configuration of one reflection surface 154a of the rotating mirror 154.
As shown in FIG. 12, the rotating mirror 154 includes a plurality of (for example, 12) reflecting surfaces 154a to 154l arranged in parallel along the rotation direction D, similarly to the rotating mirror 134 shown in FIG. I have. The reflection surfaces 154a to 154l are configured such that the curvature of the reflection surface in the rotation direction D of the rotating mirror 154 changes at each reflection surface.
　図１３に示すように、反射面１５４ａは、二つの凹状湾曲面１５５と一つの平面１５６とで構成されている。
　平面１５６は、回転方向Ｄにおいて、反射面１５４ａの中央部に配置されている。二つの凹状湾曲面１５５は、回転方向Ｄにおいて、平面１５６を間に挟むように平面１５６の両側に配置されている。二つの凹状湾曲面１５５とその間に挟まれた平面１５６とは、連続的につながるように形成されている。凹状湾曲面１５５は、回転軸Ｒ（図１２参照）側に凹んだ湾曲反射面として形成されている。二つの凹状湾曲面１５５の端部同士を結ぶ直線、すなわち、図１３において左側の凹状湾曲面１５５の左端部と右側の凹状湾曲面１５５の右端部とを結ぶ直線上における長さｘａ２、および凹状湾曲面１５５の湾曲度は、光源３２から各凹状湾曲面１５５へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。また、平面１５６の両端部を結ぶ直線上における平面１５６の長さｘｂ２は、光源３２から平面１５６へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。例えば、凹状湾曲面１５５の長さｘａ２は、平面１５６の長さｘｂ２よりも長くなるように設定されている。 As shown in FIG. 13, the reflection surface 154a includes two concave curved surfaces 155 and one flat surface 156.
The plane 156 is disposed at the center of the reflection surface 154a in the rotation direction D. The two concave curved surfaces 155 are arranged on both sides of the plane 156 so as to sandwich the plane 156 in the rotation direction D. The two concave curved surfaces 155 and the plane 156 sandwiched therebetween are formed so as to be continuously connected. The concave curved surface 155 is formed as a curved reflective surface that is concave toward the rotation axis R (see FIG. 12). A length xa2 on a straight line connecting the ends of the two concave curved surfaces 155, that is, a straight line connecting the left end of the left concave curved surface 155 and the right end of the right concave curved surface 155 in FIG. The degree of curvature of the curved surface 155 is set so that the laser light emitted from the light source 32 to each concave curved surface 155 is reflected toward the phosphor 38 at a predetermined diffusion angle. The length xb2 of the plane 156 on a straight line connecting both ends of the plane 156 is set so that the laser beam emitted from the light source 32 to the plane 156 is reflected toward the phosphor 38 at a predetermined diffusion angle. I have. For example, the length xa2 of the concave curved surface 155 is set to be longer than the length xb2 of the plane 156.
　なお、回転ミラー１５４を構成する他の反射面１５４ｂ～１５４ｌは、反射面１５４ａと同じ構成を有する。 The other reflecting surfaces 154b to 154l constituting the rotating mirror 154 have the same configuration as the reflecting surface 154a.
　図１４は、回転ミラー１５４により車両前方に形成される配光パターンＰ３を車両側から観察した図である。図１４に示すように、配光パターンＰ３は、複数の段（本例では６段）に分かれてライン（ＬＡ３～ＬＦ３）状に走査される光によって形成される。 FIG. 14 is a diagram in which the light distribution pattern P3 formed in front of the vehicle by the rotating mirror 154 is observed from the vehicle side. As shown in FIG. 14, the light distribution pattern P3 is formed by light that is divided into a plurality of stages (six in this example) and scanned in lines (LA3 to LF3).
　このような構成の回転ミラー１５４によれば、両側部の凹状湾曲面１５５で反射されたレーザ光は、中央部の平面１５６で反射されたレーザ光と比較して集光するように進行する。このため、反射光により形成される配光パターンＰ３の走査方向において、各ラインＬＡ３～ＬＦ３の側部領域を形成する光の走査速度は、各ラインＬＡ３～ＬＦ３の中央領域を形成する光の走査速度よりも遅くなる。よって、回転ミラー１５４によれば、図１４に示すように、配光パターンＰ３を形成する際に、各ラインＬＡ３～ＬＦ３における両側部領域（図１４の斜線で示す領域）の光度を各ラインＬＡ３～ＬＦ３の中央領域の光度よりも高くすることができる。
　また、回転ミラー１５４によれば、上記回転ミラー１３４と同様に、光源３２の出力制御が容易であり、かつ、光の利用効率を向上させることができる。 According to the rotating mirror 154 having such a configuration, the laser light reflected on the concave curved surfaces 155 on both sides travels so as to be focused as compared with the laser light reflected on the plane 156 at the center. Therefore, in the scanning direction of the light distribution pattern P3 formed by the reflected light, the scanning speed of the light forming the side area of each of the lines LA3 to LF3 is the scanning speed of the light forming the central area of each of the lines LA3 to LF3. Slower than speed. Therefore, according to the rotating mirror 154, as shown in FIG. 14, when forming the light distribution pattern P3, the luminous intensity of both side regions (regions indicated by oblique lines in FIG. 14) of each of the lines LA3 to LF3 is changed to each line LA3. It can be made higher than the luminous intensity of the central region of LF3.
Further, according to the rotating mirror 154, similarly to the rotating mirror 134, the output control of the light source 32 is easy and the light use efficiency can be improved.
（第三変形例）
　図１５は、第三変形例に係る回転ミラー１６４の構成を示す図であり、図１６は、回転ミラー１６４の一つの反射面１６４ａの構成を示す図である。
　図１５に示すように、回転ミラー１６４は、図７に示す回転ミラー１３４と同様に、回転方向Ｄに沿って並列して配置される複数（例えば１２面）の反射面１６４ａ～１６４ｌを備えている。反射面１６４ａ～１６４ｌは、各反射面において回転ミラー１６４の回転方向Ｄにおける反射面の曲率が変化するように構成されている。 (Third modification)
FIG. 15 is a diagram illustrating a configuration of a rotating mirror 164 according to a third modification, and FIG. 16 is a diagram illustrating a configuration of one reflection surface 164a of the rotating mirror 164.
As shown in FIG. 15, the rotating mirror 164 includes a plurality of (for example, 12) reflecting surfaces 164a to 164l arranged in parallel along the rotation direction D, similarly to the rotating mirror 134 shown in FIG. I have. The reflecting surfaces 164a to 164l are configured such that the curvature of the reflecting surface in the rotation direction D of the rotating mirror 164 changes at each reflecting surface.
　図１６に示すように、反射面１６４ａは、二つの平面１６５と一つの凸状湾曲面１６６とで構成されている。
　凸状湾曲面１６６は、回転方向Ｄにおいて、反射面１６４ａの中央部に配置されている。二つの平面１６５は、回転方向Ｄにおいて、凸状湾曲面１６６を間に挟むように凸状湾曲面１６６の両側に配置されている。二つの平面１６５とその間に挟まれた凸状湾曲面１６６とは、連続的につながるように形成されている。二つの平面１６５は、凸状湾曲面１６６側（反射面１６４ａの中央）に向かって上り傾斜となるように形成されている。凸状湾曲面１６６は、回転ミラー１６４の外方向に突出する湾曲反射面として形成されている。二つの平面１６５の端部同士を結ぶ直線、すなわち、図１６において左側の平面１６５の左端部と右側の平面１６５の右端部とを結ぶ直線上における長さｘａ３、および当該直線に対する平面１６５の傾斜角度は、光源３２から各平面１６５へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。また、凸状湾曲面１６６の両端部を結ぶ直線上における凸状湾曲面１６６の長さｘｂ３、および凸状湾曲面１６６の湾曲度は、光源３２から凸状湾曲面１６６へ照射されたレーザ光が蛍光体３８に向けて所定の拡散角度で反射するように設定されている。例えば、平面１６５の長さｘａ３は、平面１５６の長さｘｂ３よりも長くなるように設定されている。 As shown in FIG. 16, the reflection surface 164a is composed of two flat surfaces 165 and one convex curved surface 166.
The convex curved surface 166 is disposed at the center of the reflection surface 164a in the rotation direction D. The two flat surfaces 165 are arranged on both sides of the convex curved surface 166 so as to sandwich the convex curved surface 166 in the rotation direction D. The two flat surfaces 165 and the convex curved surface 166 sandwiched therebetween are formed so as to be continuously connected. The two planes 165 are formed so as to be inclined upward toward the convex curved surface 166 side (the center of the reflection surface 164a). The convex curved surface 166 is formed as a curved reflective surface that protrudes outward from the rotating mirror 164. A length xa3 on a straight line connecting the ends of the two planes 165, that is, a straight line connecting the left end of the left plane 165 and the right end of the right plane 165 in FIG. 16, and the inclination of the plane 165 with respect to the straight line The angle is set such that the laser beam emitted from the light source 32 to each plane 165 is reflected toward the phosphor 38 at a predetermined diffusion angle. The length xb3 of the convex curved surface 166 on a straight line connecting both ends of the convex curved surface 166, and the degree of curvature of the convex curved surface 166 are determined by the laser light emitted from the light source 32 to the convex curved surface 166. Is set to be reflected toward the phosphor 38 at a predetermined diffusion angle. For example, the length xa3 of the plane 165 is set to be longer than the length xb3 of the plane 156.
　なお、回転ミラー１６４を構成する他の反射面１６４ｂ～１６４ｌは、反射面１６４ａと同じ構成を有する。 The other reflecting surfaces 164b to 164l constituting the rotating mirror 164 have the same configuration as the reflecting surface 164a.
　このような構成の回転ミラー１６４によれば、中央部の凸状湾曲面１６６で反射されたレーザ光の拡散角度は、両側部の平面１６５で反射されたレーザ光の拡散角度よりも大きくなるように構成されている。このため、反射光により形成される配光パターンの走査方向において、各ラインの側部領域を形成する光の走査速度は、各ラインの中央領域を形成する光の走査速度よりも遅くなる。よって、回転ミラー１６４によれば、上記回転ミラー１５４で形成される図１４の配光パターンＰ３と同様に、各ライン（ＬＡ３～ＬＦ３）における両側部領域（斜線で示す領域）の光度を各ラインの中央領域の光度よりも高くすることができる。
　また、回転ミラー１６４によれば、上記回転ミラー１３４と同様に、光源３２の出力制御が容易であり、且つ、光の利用効率を向上させることができる。 According to the rotating mirror 164 having such a configuration, the diffusion angle of the laser light reflected by the convex curved surface 166 at the center is larger than the diffusion angle of the laser light reflected by the flat surfaces 165 on both sides. Is configured. For this reason, in the scanning direction of the light distribution pattern formed by the reflected light, the scanning speed of the light forming the side region of each line is lower than the scanning speed of the light forming the central region of each line. Therefore, according to the rotating mirror 164, similarly to the light distribution pattern P3 of FIG. 14 formed by the rotating mirror 154, the luminous intensity of both side regions (regions indicated by oblique lines) in each line (LA3 to LF3) is calculated. Can be higher than the luminous intensity of the central region of
Further, according to the rotating mirror 164, similarly to the rotating mirror 134, the output control of the light source 32 is easy and the light use efficiency can be improved.
　なお、上記第一実施形態および第一変形例～第三変形例においては、同じ構成の反射面同士を対角線上に配置させ、この対角線上の両反射面の傾斜角度を同じにしているが、この組み合わせに限定されない。例えば、第一実施形態における二つの平面１３５と一つの凹状湾曲面１３６とで構成される反射面と、第一変形例における二つの凸状湾曲面１４５と一つの平面１４６とで構成される反射面とを対角線上に配置させ、両反射面の傾斜角度を同じにしてもよい。また、第二変形例における二つの凹状湾曲面１５５と一つの平面１５６とで構成される反射面と、第三変形例における二つの平面１６５と一つの凸状湾曲面１６６とで構成される反射面とを対角線上に配置させ、両反射面の傾斜角度を同じにしてもよい。さらに、第一実施形態、第一変形例～第三変形例における反射面を上記以外の組み合わせで配置させるようにしてもよい。 In the first embodiment and the first to third modifications, the reflecting surfaces having the same configuration are arranged diagonally, and the inclination angles of both reflecting surfaces on the diagonal are the same. It is not limited to this combination. For example, a reflection surface composed of two planes 135 and one concave curved surface 136 in the first embodiment, and a reflection surface composed of two convex curved surfaces 145 and one plane 146 in the first modification. The surfaces may be arranged diagonally, and the inclination angles of both reflecting surfaces may be the same. Further, a reflection surface composed of two concave curved surfaces 155 and one flat surface 156 in the second modification, and a reflection surface composed of two planes 165 and one convex curved surface 166 in the third modification. The surfaces may be arranged diagonally, and the inclination angles of both reflecting surfaces may be the same. Further, the reflecting surfaces in the first embodiment and the first to third modifications may be arranged in other combinations.
　また、第一実施形態および第一変形例～第三変形例においては、各反射面を平面と凹状湾曲面、あるいは平面と凸状湾曲面により構成しているが、この組み合わせに限定されない。例えば、各反射面の中央領域を凹状湾曲面で構成し、その両側部領域を凸状湾曲面で構成するようにしてもよい。また、各反射面の中央領域を凸状湾曲面で構成し、その両側部領域を凹状湾曲面で構成するようにしてもよい。 Further, in the first embodiment and the first to third modifications, each reflecting surface is constituted by a plane and a concave curved surface, or a plane and a convex curved surface, but is not limited to this combination. For example, the central region of each reflecting surface may be configured with a concave curved surface, and the both side regions may be configured with a convex curved surface. Further, the central region of each reflecting surface may be formed by a convex curved surface, and the both side regions may be formed by a concave curved surface.
　また、上記の実施形態および変形例においては、上面視において１２面体の回転ミラーを用い、対角線上に配置された一対の反射面により反射された光が配光パターンのうち同一のラインを形成しているが、この例に限られない。例えば、一つの反射面で反射された光により一つのラインを形成するようにしてもよい。この場合は、例えば、配光パターンが六つのラインから構成されるとすると、回転ミラーは、上面視において６面体として形成され、回転方向に沿って六つの反射面を備えることとなる。 Further, in the above-described embodiment and modified examples, a dodecahedral rotating mirror is used in a top view, and light reflected by a pair of reflecting surfaces arranged diagonally forms the same line in the light distribution pattern. However, the present invention is not limited to this example. For example, one line may be formed by light reflected on one reflection surface. In this case, for example, assuming that the light distribution pattern is composed of six lines, the rotating mirror is formed as a hexahedron in a top view, and has six reflecting surfaces along the rotating direction.
（第四変形例）
　図１７は、第四変形例に係るランプユニット５３０を示す。
　図１７に示すように、上記実施形態で用いたポリゴンミラー１３４の代わりに、ブレードスキャン（登録商標）方式の回転ミラー（回転リフレクタ）５００を用いてもよい。回転ミラー５００は、複数枚（図１７では３枚）のブレード５０１ａと、筒状の回転部５０１ｂとを備えている。各ブレード５０１ａは、回転部５０１ｂの周囲に設けられており、反射面として機能する。回転ミラー５００は、その回転軸Ｒが光軸Ａｘに対して斜めになるように配置されている。 (Fourth modification)
FIG. 17 shows a lamp unit 530 according to a fourth modification.
As shown in FIG. 17, a rotating mirror (rotating reflector) 500 of a blade scan (registered trademark) method may be used instead of the polygon mirror 134 used in the above embodiment. The rotating mirror 500 includes a plurality of (three in FIG. 17) blades 501a and a cylindrical rotating part 501b. Each blade 501a is provided around the rotating part 501b and functions as a reflecting surface. The rotating mirror 500 is arranged so that its rotation axis R is oblique to the optical axis Ax.
　ブレード５０１ａは、回転軸Ｒを中心とする周方向に向かうにつれて、光軸Ａｘと反射面とが成す角が変化するように捩られた形状を有している。これにより、ポリゴンミラー１３４と同様に、光源３２の光を用いた走査が可能となる。 The blade 501a has a shape twisted such that the angle formed between the optical axis Ax and the reflection surface changes in the circumferential direction around the rotation axis R. Thus, similarly to the polygon mirror 134, scanning using light from the light source 32 can be performed.
　各ブレード５０１ａは、回転ミラー５００の回転方向における反射面の曲率が変化するように構成されている。例えば、各ブレード５０１ａの反射面は、図８、図１１、図１３および図１６のいずれか一つに図示された回転ミラーの反射面と同様の形状となるように形成されている。このような回転ミラー５００を用いた場合も、上記実施形態と同様に、曲率の変化に応じて光の走査速度が変化するため、配光パターンの一部を他の部分よりも明るくすることが可能となる。 ブ レ ー ド Each blade 501a is configured such that the curvature of the reflection surface in the rotation direction of the rotating mirror 500 changes. For example, the reflecting surface of each blade 501a is formed to have the same shape as the reflecting surface of the rotating mirror illustrated in any one of FIGS. 8, 11, 13, and 16. Even when such a rotating mirror 500 is used, as in the above-described embodiment, the light scanning speed changes in accordance with the change in the curvature, so that a part of the light distribution pattern can be made brighter than the other parts. It becomes possible.
　上記の実施形態においては、ランプユニットが車両用前照灯に搭載されたものとして説明しているが、この例に限られない。上記で説明したような光源や回転ミラー等を備えた光学ユニットを、車両に搭載されるセンサユニット（例えば、レーザレーダやＬｉＤＡＲ等）の構成部品に適用することもできる。この場合も、回転ミラーの各反射面において回転ミラーの回転方向における曲率が変化するように構成することで、センサ対象範囲のうち特定の領域のセンサ感度を向上させることができる。 In the above embodiment, the lamp unit is described as being mounted on the vehicle headlamp, but is not limited to this example. The optical unit including the light source and the rotating mirror as described above can also be applied to components of a sensor unit (for example, a laser radar or LiDAR) mounted on a vehicle. Also in this case, by configuring so that the curvature in the rotation direction of the rotating mirror changes at each reflection surface of the rotating mirror, it is possible to improve the sensor sensitivity of a specific area in the sensor target range.
（第二実施形態）
　図１８は、第二実施形態に係るランプユニット２３０の上面図を示す。図１８に示すようにランプユニット２３０は、光源３２と、回転ミラー２３４と、平凸レンズ３６と、蛍光体３８と、を備えている。 (Second embodiment)
FIG. 18 shows a top view of a lamp unit 230 according to the second embodiment. As shown in FIG. 18, the lamp unit 230 includes a light source 32, a rotating mirror 234, a plano-convex lens 36, and a phosphor 38.
　ランプユニット２３０の回転ミラー２３４は、回転方向Ｄに沿って並列して配置される複数（本例では８面）の反射面２３４ａ～２３４ｈを有している。回転ミラー２３４の反射面２３４ａ～２３４ｈは、本例では全て平面状に形成されている。また、反射面２３４ａ～２３４ｈは、各反射面の回転方向Ｄに沿った面の長さが同じ長さになるように形成されている。なお、反射面の形状は、平面に限定されず、例えば、凸状の湾曲面、凹状の湾曲面等で構成するようにしてもよい。 The rotating mirror 234 of the lamp unit 230 has a plurality of (eight in this example) reflecting surfaces 234a to 234h arranged in parallel along the rotating direction D. The reflecting surfaces 234a to 234h of the rotating mirror 234 are all formed in a plane in this example. The reflecting surfaces 234a to 234h are formed such that the lengths of the respective reflecting surfaces along the rotation direction D are the same. The shape of the reflection surface is not limited to a flat surface, and may be, for example, a convex curved surface, a concave curved surface, or the like.
　光源３２から照射されたレーザ光が反射面２３４ａ～２３４ｈで反射されるときの各反射面２３４ａ～２３４ｈと光軸Ａｘとのそれぞれの成す角は、少なくともその中の二つの成す角が同じとなるように形成されている。例えば、反射面２３４ａ～２３４ｆの各反射面と光軸Ａｘとの成す角がそれぞれ異なるように形成されており、反射面２３４ｇと光軸Ａｘとの成す角が反射面２３４ｃと光軸Ａｘとの成す角と同じになるように形成され、反射面２３４ｈと光軸Ａｘとの成す角が反射面２３４ｄと光軸Ａｘとの成す角と同じになるように形成されている（図４，図５参照）。 When the laser light emitted from the light source 32 is reflected by the reflection surfaces 234a to 234h, at least two angles formed by the reflection surfaces 234a to 234h and the optical axis Ax are the same. It is formed as follows. For example, the angle between each of the reflection surfaces 234a to 234f and the optical axis Ax is formed differently, and the angle between the reflection surface 234g and the optical axis Ax is defined as the angle between the reflection surface 234c and the optical axis Ax. The angle formed by the reflection surface 234h and the optical axis Ax is the same as the angle formed by the reflection surface 234d and the optical axis Ax (FIGS. 4 and 5). reference).
　反射面２３４ａ～２３４ｆの各反射面と光軸Ａｘとの成す角は、例えば、反射面２３４ｂと光軸Ａｘとの成す角が、反射面２３４ａと光軸Ａｘとの成す角よりもやや小さくなるように形成されている。同様に、反射面２３４ｃ、反射面２３４ｄ、反射面２３４ｅ、反射面２３４ｆの順で、各反射面と光軸Ａｘとの成す角が小さくなるように形成されている。これにより、反射面２３４ａ～２３４ｆの一の反射面により反射された光は、車両前方の上下方向において他の反射面とは異なる位置に照射される。例えば、反射面２３４ｂで反射された光は、反射面２３４ａで反射された光よりも上方に照射される。また、反射面２３４ｃで反射された光は、反射面２３４ｂで反射された光よりも上方に照射される。また、反射面２３４ｄで反射された光は、反射面２３４ｃで反射された光よりも上方に照射される。また、反射面２３４ｅで反射された光は、反射面２３４ｄで反射された光よりも上方に照射される。また、反射面２３４ｆで反射された光は、反射面２３４ｅで反射された光よりも上方に照射される。 For example, the angle formed between each of the reflecting surfaces 234a to 234f and the optical axis Ax is slightly smaller than the angle formed between the reflecting surface 234b and the optical axis Ax. It is formed as follows. Similarly, the reflection surface 234c, the reflection surface 234d, the reflection surface 234e, and the reflection surface 234f are formed in this order so that the angle formed between each reflection surface and the optical axis Ax becomes smaller. Thus, the light reflected by one of the reflecting surfaces 234a to 234f is applied to a position different from the other reflecting surfaces in the vertical direction in front of the vehicle. For example, the light reflected by the reflecting surface 234b is irradiated above the light reflected by the reflecting surface 234a. Further, the light reflected by the reflecting surface 234c is irradiated above the light reflected by the reflecting surface 234b. Further, the light reflected by the reflecting surface 234d is irradiated above the light reflected by the reflecting surface 234c. Further, the light reflected by the reflecting surface 234e is irradiated above the light reflected by the reflecting surface 234d. Further, the light reflected by the reflecting surface 234f is irradiated above the light reflected by the reflecting surface 234e.
　そして、反射面２３４ｇで反射された光は、光軸Ａｘとの成す角が同じである反射面２３４ｃで反射された光と同じ方向に照射される。また、反射面２３４ｈで反射された光は、光軸Ａｘとの成す角が同じである反射面２３４ｄで反射された光と同じ方向に照射される。 (4) The light reflected by the reflecting surface 234g is irradiated in the same direction as the light reflected by the reflecting surface 234c having the same angle with the optical axis Ax. The light reflected by the reflection surface 234h is irradiated in the same direction as the light reflected by the reflection surface 234d having the same angle with the optical axis Ax.
　図１９は、ランプユニット２３０により車両前方に形成される配光パターンＰ４を示す。
　図１９に示すように、配光パターンＰ４は、光源３２から出射されたレーザ光により形成される複数のライン（ＬＡ４～ＬＨ４）を含んでいる。光源３２から出射されたレーザ光は、回転ミラー２３４の各反射面２３４ａ～２３４ｈで反射され、蛍光体３８を介して平凸レンズ３６を透過する。参考実施形態と同様に、平凸レンズ３６の後方焦点は蛍光体３８の光出射面近傍に設定されているため、蛍光体３８の光出射面の光像が上下反転して前方へ照射される。レーザ光は、回転ミラー２３４の回転によって光の反射方向が変位することで、複数の段に分かれてライン状に走査される。 FIG. 19 shows a light distribution pattern P4 formed in front of the vehicle by the lamp unit 230.
As shown in FIG. 19, the light distribution pattern P4 includes a plurality of lines (LA4 to LH4) formed by the laser light emitted from the light source 32. The laser light emitted from the light source 32 is reflected by each of the reflecting surfaces 234a to 234h of the rotating mirror 234, and passes through the plano-convex lens 36 via the phosphor 38. As in the reference embodiment, the rear focal point of the plano-convex lens 36 is set near the light emitting surface of the phosphor 38, so that the light image on the light emitting surface of the phosphor 38 is inverted upside down and irradiated forward. The laser light is scanned in a line by being divided into a plurality of stages by the displacement of the light reflection direction due to the rotation of the rotating mirror 234.
　具体的には、反射面２３４ａで反射された光により、図１９に示す配光パターンＰ４のうち最下部のラインＬＡ４が形成される。また、反射面２３４ｂで反射された光により、ラインＬＡ４の上側にラインＬＢ４が形成される。反射面２３４ｃで反射された光により、ラインＬＢ４の上側にラインＬＣ４が形成される。反射面２３４ｄで反射された光により、ラインＬＣ４の上側にラインＬＤ４が形成される。反射面２３４ｅで反射された光により、ラインＬＤ４の上側にラインＬＥ４が形成される。反射面２３４ｆで反射された光により、ラインＬＥ４の上側にラインＬＦ４が形成される。そして、反射面２３４ｇで反射された光により、ラインＬＣ４に重複してラインＬＧ４が形成される。反射面２３４ｈで反射された光により、ラインＬＤ４に重複してラインＬＨ４が形成される。 {Specifically, the light reflected by the reflection surface 234a forms the lowermost line LA4 of the light distribution pattern P4 shown in FIG. Further, a line LB4 is formed above the line LA4 by the light reflected by the reflection surface 234b. The line LC4 is formed above the line LB4 by the light reflected by the reflection surface 234c. A line LD4 is formed above the line LC4 by the light reflected by the reflection surface 234d. A line LE4 is formed above the line LD4 by the light reflected by the reflection surface 234e. A line LF4 is formed above the line LE4 by the light reflected by the reflection surface 234f. Then, a line LG4 is formed overlapping with the line LC4 by the light reflected by the reflection surface 234g. The line LH4 is formed overlapping with the line LD4 by the light reflected by the reflection surface 234h.
　本例においては、配光パターンＰ４の上下方向における中央下部のライン（上から四段目に相当するラインＬＣ４，ＬＧ４）が反射面２３４ｃで反射された光と反射面２３４ｇで反射された光とにより二度走査されるように構成されている。また、配光パターンＰ４の上下方向における中央上部のライン（上から三段目に相当するラインＬＤ４，ＬＨ４）が反射面２３４ｄで反射された光と反射面２３４ｈで反射された光とにより二度走査されるように構成されている。
　なお、重複して走査されるラインは、反射面と光軸Ａｘとの成す角を設定することにより、配光パターンＰ４における任意のラインとすることが可能である。 In this example, the lines at the lower center of the light distribution pattern P4 in the vertical direction (lines LC4 and LG4 corresponding to the fourth stage from the top) are the light reflected by the reflection surface 234c and the light reflected by the reflection surface 234g. Is configured to scan twice. Further, a line at the upper center in the vertical direction of the light distribution pattern P4 (lines LD4 and LH4 corresponding to the third stage from the top) is twice formed by the light reflected by the reflection surface 234d and the light reflected by the reflection surface 234h. It is configured to be scanned.
In addition, the line scanned repeatedly can be an arbitrary line in the light distribution pattern P4 by setting an angle between the reflection surface and the optical axis Ax.
　このようにランプユニット２３０は、回転ミラー２３４の複数の反射面２３４ａ～２３４ｈのうち少なくとも二つの反射面で反射された光により、配光パターンＰ４の上下方向における一部のラインを重複して走査することができるように構成されている。例えば、配光パターンＰ４は、ラインＬＦ４，ＬＥ４，ＬＢ４，ＬＡ４（第一のラインの一例）、およびラインＬＦ４，ＬＥ４とラインＬＢ４，ＬＡ４（第一のラインの一例）との間に配置されたラインＬＤ４（ＬＨ４），ＬＣ４（ＬＧ４）（第二のラインの一例）とから構成されている。そして、回転ミラー２３４の二つの反射面２３４ｄおよび反射面２３４ｈで反射されたレーザ光が同一のラインＬＤ４（ＬＨ４）を形成し、二つの反射面２３４ｃおよび反射面２３４ｇで反射されたレーザ光が同一のラインＬＣ４（ＬＧ４）を形成するように構成されている。このため、ランプユニット２３０の構成によれば、例えば、図１９に示すように、配光パターンＰ４のうち上下方向の中央部の領域（図１９の斜線で示す領域）の光度をそれ以外の領域の光度よりも高めることができる。 As described above, the lamp unit 230 scans some lines in the vertical direction of the light distribution pattern P4 by light reflected on at least two of the plurality of reflecting surfaces 234a to 234h of the rotating mirror 234. It is configured to be able to. For example, the light distribution pattern P4 is disposed between the lines LF4, LE4, LB4, and LA4 (an example of a first line) and between the lines LF4 and LE4 and the lines LB4 and LA4 (an example of a first line). Lines LD4 (LH4) and LC4 (LG4) (an example of a second line). The laser beams reflected by the two reflecting surfaces 234d and 234h of the rotating mirror 234 form the same line LD4 (LH4), and the laser beams reflected by the two reflecting surfaces 234c and 234g are the same. Are formed to form the line LC4 (LG4). For this reason, according to the configuration of the lamp unit 230, for example, as shown in FIG. 19, the luminous intensity of the central portion in the vertical direction of the light distribution pattern P4 (the region indicated by oblique lines in FIG. Luminous intensity can be increased.
　なお、上記第二実施形態においては、上面視において８面体の回転ミラー２３４を用いているが、この例に限定されない。各反射面と光軸Ａｘとの成す角の中の少なくとも二つの成す角が同じとなるように形成されていればよく、例えば、図１９に示すように６行のラインで配光パターンを形成する場合には、７面以上の反射面を有する回転ミラーであればよい。 In the second embodiment, the octahedral rotating mirror 234 is used in a top view, but is not limited to this example. It is sufficient that at least two of the angles formed by each reflection surface and the optical axis Ax are the same. For example, a light distribution pattern is formed by six lines as shown in FIG. In this case, a rotating mirror having seven or more reflecting surfaces may be used.
（第五変形例および第六変形例）
　図２０は、第五変形例に係るランプユニット３３０の上面図である。図２０に示すようにランプユニット３３０は、光源３２と、回転ミラー３３４と、平凸レンズ３６と、蛍光体３８と、を備えている。 (Fifth Modification and Sixth Modification)
FIG. 20 is a top view of a lamp unit 330 according to the fifth modification. As shown in FIG. 20, the lamp unit 330 includes a light source 32, a rotating mirror 334, a plano-convex lens 36, and a phosphor 38.
　ランプユニット３３０の回転ミラー３３４は、回転方向Ｄに沿って並列して配置される複数（本例では８面）の反射面３３４ａ～３３４ｈを有している。回転ミラー３３４の反射面３３４ａ～３３４ｈは、本例では全て平面状に形成されている。また、反射面３３４ａ～３３４ｈのうち反射面３３４ｅは、他の反射面よりも、回転方向Ｄに沿った面の長さ（面幅）が短くなるように形成されている。反射面３３４ｅの両側の反射面３３４ｄ，３３４ｆの面幅を長くすることで、反射面３３４ｅの面幅を短くすることができる。これにより、反射面３３４ｅで反射された光は、他の反射面で反射された光に比べて、左右方向において狭い範囲に照射される。なお、図示は省略するが、側面視において、面幅の短い反射面３３４ｅと光軸Ａｘとの成す角は、反射面３３４ｅと隣り合う反射面３３４ｄと光軸Ａｘとの成す角と同一に設定されている。これにより、反射面３３４ｄで反射された光と反射面３３４ｅで反射された光とが同一ライン上に照射される。 The rotating mirror 334 of the lamp unit 330 has a plurality (eight in this example) of reflecting surfaces 334a to 334h arranged in parallel along the rotating direction D. The reflecting surfaces 334a to 334h of the rotating mirror 334 are all formed in a plane in this example. The reflecting surface 334e of the reflecting surfaces 334a to 334h is formed such that the length (surface width) of the surface along the rotation direction D is shorter than the other reflecting surfaces. By increasing the surface width of the reflection surfaces 334d and 334f on both sides of the reflection surface 334e, the surface width of the reflection surface 334e can be reduced. As a result, the light reflected on the reflection surface 334e is applied to a narrower range in the left-right direction than the light reflected on the other reflection surfaces. Although not shown, in a side view, an angle formed between the reflecting surface 334e having a short surface width and the optical axis Ax is set to be the same as an angle formed between the reflecting surface 334d adjacent to the reflecting surface 334e and the optical axis Ax. Have been. Thereby, the light reflected by the reflecting surface 334d and the light reflected by the reflecting surface 334e are irradiated on the same line.
　図２１は、第六変形例に係るランプユニット４３０の上面図である。図２１に示すようにランプユニット４３０は、光源３２と、回転ミラー４３４と、平凸レンズ３６と、蛍光体３８と、を備えている。 FIG. 21 is a top view of a lamp unit 430 according to the sixth modification. As shown in FIG. 21, the lamp unit 430 includes a light source 32, a rotating mirror 434, a plano-convex lens 36, and a phosphor 38.
　ランプユニット４３０の回転ミラー４３４は、回転方向Ｄに沿って並列して配置される複数（本例では８面）の反射面４３４ａ～４３４ｈを有している。回転ミラー４３４の反射面４３４ａ～４３４ｈのうち反射面４３４ｅは、回転軸Ｒ側に凹んだ凹状湾曲面として形成されている。また、反射面４３４ｅ以外の反射面４３４ａ～４３４ｄ，４３４ｆ～４３４ｈは、すべて平面状に形成されている。これにより、凹状の反射面４３４ｅで反射された光は、平面状の反射面４３４ａ～４３４ｄ，４３４ｆ～４３４ｈで反射された光に比べて、左右方向において集光される。なお、図示は省略するが、側面視において、面幅の短い反射面４３４ｅと光軸Ａｘとの成す角は、反射面４３４ｅと隣り合う反射面４３４ｄと光軸Ａｘとの成す角と同一に設定されている。これにより、反射面４３４ｄで反射された光と反射面４３４ｅで反射された光とが同一ライン上に照射される。 The rotating mirror 434 of the lamp unit 430 has a plurality of (eight in this example) reflecting surfaces 434a to 434h arranged in parallel along the rotating direction D. The reflecting surface 434e of the reflecting surfaces 434a to 434h of the rotating mirror 434 is formed as a concave curved surface that is recessed toward the rotation axis R. The reflecting surfaces 434a to 434d and 434f to 434h other than the reflecting surface 434e are all formed in a planar shape. Thus, the light reflected by the concave reflecting surface 434e is converged in the left-right direction as compared with the light reflected by the planar reflecting surfaces 434a to 434d and 434f to 434h. Although not shown, in a side view, an angle formed between the reflecting surface 434e having a short surface width and the optical axis Ax is set to be the same as an angle formed between the reflecting surface 434d adjacent to the reflecting surface 434e and the optical axis Ax. Have been. Thereby, the light reflected by the reflection surface 434d and the light reflected by the reflection surface 434e are irradiated on the same line.
　図２２は、第二実施形態の第五変形例および第六変形例に係る配光パターンＰ５の一例を示す模式図である。
　図２２に示すように、配光パターンＰ５は、ラインＬＨ５，ＬＧ５，ＬＦ５，ＬＤ５，ＬＣ５，ＬＢ５，ＬＡ５と、ラインＬＤ５と同一ライン上であってラインＬＤ５の左右方向における中央領域に重複して形成されるラインＬＥ５とから構成されている。第五変形例の回転ミラー３３４の場合は、ラインＬＥ５を形成するための反射面３３４ｅの面幅が他の反射面の面幅よりも短く設定されているため、ラインＬＥ５の左右方向の長さはラインＬＤ５等の長さよりも短くなる。また、第六変形例の回転ミラー４３４の場合は、ラインＬＥ５を形成するための反射面４３４ｅが凹状湾曲面として形成されているため、反射面４３４ｅで反射された光は左右方向において集光され、ラインＬＥ５の左右方向の長さはラインＬＤ５等の長さよりも短くなる。 FIG. 22 is a schematic diagram illustrating an example of a light distribution pattern P5 according to a fifth modification and a sixth modification of the second embodiment.
As shown in FIG. 22, the light distribution pattern P5 overlaps the lines LH5, LG5, LF5, LD5, LC5, LB5, and LA5 on the same line as the line LD5 and in the central region of the line LD5 in the left-right direction. And the line LE5 formed. In the case of the rotating mirror 334 of the fifth modified example, since the surface width of the reflection surface 334e for forming the line LE5 is set shorter than the surface width of the other reflection surfaces, the length of the line LE5 in the left-right direction is set. Is shorter than the length of the line LD5 or the like. In the case of the rotating mirror 434 of the sixth modified example, since the reflecting surface 434e for forming the line LE5 is formed as a concave curved surface, the light reflected by the reflecting surface 434e is collected in the left-right direction. The length of the line LE5 in the left-right direction is shorter than the length of the line LD5 or the like.
　このように、反射面３３４ｅ，４３４ｅによって形成されるラインを他の反射面によって形成されるラインの一部に重畳させることで、配光パターンの一部領域の光度を他の領域の光度よりも高くすることができる。なお、図２２の例においては、ラインＬＥ５は、ラインＬＤ５の中央領域に重複して形成されているが、ラインの重畳部位の範囲（位置、大きさ、形状等）はこの例に限られない。ラインの重畳範囲に自由度を持たせることで、配光パターンの所望の領域の光度を適宜変更することができる。 As described above, by superimposing the line formed by the reflecting surfaces 334e and 434e on a part of the line formed by the other reflecting surface, the luminous intensity of a partial area of the light distribution pattern is higher than the luminous intensity of the other area. Can be higher. In the example of FIG. 22, the line LE5 is formed so as to overlap the central region of the line LD5, but the range (position, size, shape, etc.) of the overlapping portion of the line is not limited to this example. . By giving a degree of freedom to the overlapping range of the line, the luminous intensity of a desired region of the light distribution pattern can be changed as appropriate.
（第七変形例）
　上記第二実施形態で用いたポリゴンミラー２３４，３３４，４３４の代わりに、ブレードスキャン方式の回転ミラー５００を用いてもよい（図１７参照）。図１７の回転ミラー５００においても、複数のブレード５０１ａのうち少なくとも二つのブレード５０１ａで反射された光が、配光パターンの上下方向における一部のラインを重複して走査することができるように構成することで、上記第二実施形態と同様に、配光パターンのうち一部の領域の光度をそれ以外の領域の光度よりも高めることができる。 (Seventh modification)
Instead of the polygon mirrors 234, 334, and 434 used in the second embodiment, a blade scan type rotation mirror 500 may be used (see FIG. 17). Also in the rotating mirror 500 of FIG. 17, the light reflected by at least two blades 501a of the plurality of blades 501a can scan a part of lines in the vertical direction of the light distribution pattern so as to overlap. By doing so, the luminous intensity of some regions of the light distribution pattern can be higher than the luminous intensity of other regions, as in the second embodiment.
　上記の第二実施形態においては、ランプユニットが車両用前照灯に搭載されたものとして説明しているが、この例に限られない。上記で説明したような光源や回転ミラー等を備えた光学ユニットを、車両に搭載されるセンサユニット（例えば、レーザレーダやＬｉＤＡＲ等）の構成部品に適用することもできる。この場合も、回転ミラーの複数の反射面のうち少なくとも二つの反射面で反射された光が同一の範囲を照射するように構成されていることで、センサ対象範囲のうち特定の領域におけるセンサ感度を向上させることができる。 In the second embodiment, the lamp unit is described as being mounted on the vehicle headlamp, but is not limited to this example. The optical unit including the light source and the rotating mirror as described above can also be applied to components of a sensor unit (for example, a laser radar or LiDAR) mounted on a vehicle. Also in this case, since the light reflected by at least two of the plurality of reflecting surfaces of the rotating mirror is configured to irradiate the same range, the sensor sensitivity in a specific region of the sensor target range is adjusted. Can be improved.
（第三実施形態）
　第三実施形態に係るハイビーム用のランプユニット６３０は、図２３に示すように、光源６３２と、リフレクタとしての回転ミラー３４（第一のミラーの一例）と、回転ミラー３４の前方に配置された投影レンズとしての平凸レンズ３６と、回転ミラー３４と平凸レンズ３６との間に配置された蛍光体３８と、前後方向において、回転ミラー３４の回転軸Ｒより前であって、蛍光体３８より後に配置されたミラー３５（第二のミラーの一例）と、を備えている。 (Third embodiment)
As shown in FIG. 23, the high beam lamp unit 630 according to the third embodiment is disposed in front of the rotating mirror 34 with the light source 632, the rotating mirror 34 as a reflector (an example of a first mirror). A plano-convex lens 36 as a projection lens, a fluorescent body 38 disposed between the rotating mirror 34 and the plano-convex lens 36, and a front side of the rotation axis R of the rotating mirror 34 and a rear side of the phosphor 38 in the front-rear direction. And an arranged mirror 35 (an example of a second mirror).
　第三実施形態に係るランプユニット６３０は、ミラー３５をさらに備えている点、及び光源３２に代わりに光源６３２を備えている点で、参考実施形態に係るランプユニット３０と異なる。 The lamp unit 630 according to the third embodiment is different from the lamp unit 30 according to the reference embodiment in that the lamp unit 630 further includes a mirror 35 and that a light source 632 is provided instead of the light source 32.
　光源６３２は光源３２と同じ機能を有する。参考実施形態に係る光源３２は回転ミラー３４の前方に配置されているのに対し、第三実施形態に係る光源６３２は、回転ミラー３４の斜め後方に配置されている The light source 632 has the same function as the light source 32. The light source 32 according to the reference embodiment is disposed in front of the rotating mirror 34, whereas the light source 632 according to the third embodiment is disposed obliquely behind the rotating mirror 34.
　ミラー３５は、前後方向において、回転ミラー３４の回転軸Ｒより前であって、蛍光体３８より後に配置されている。ミラー３５は、回転ミラー３４の左前方に配置されている。ミラー３５の表面のうち、回転ミラー３４に対向する表面は反射面である。ミラー３５は、回転ミラー３４によって反射されたレーザ光が当たる位置に配置されている。 The mirror 35 is disposed before the rotation axis R of the rotation mirror 34 and after the phosphor 38 in the front-rear direction. The mirror 35 is arranged on the left front of the rotating mirror 34. Of the surfaces of the mirror 35, the surface facing the rotating mirror 34 is a reflection surface. The mirror 35 is disposed at a position where the laser beam reflected by the rotating mirror 34 shines.
　図２４は、第三実施形態に係る光学ユニットの上面図である。回転ミラー３４が、図２４に示すような配置関係にあるとき、光源６３２から出射されたレーザ光は、回転ミラー３４の反射面３４ａに当たる。当該レーザ光は、反射面３４ａによって反射され、ミラー３５に向かって直進する。反射面３４ａによって反射されたレーザ光が、ミラー３５の反射面に当たると、当該レーザ光はミラー３５の反射面によって反射され、反射されたレーザ光は、蛍光体３８に向かって直進する。このときの蛍光体３８上での走査範囲はＳ２である。当該レーザ光は、その後、蛍光体３８を介して平凸レンズ３６を透過する。 FIG. 24 is a top view of the optical unit according to the third embodiment. When the rotating mirror 34 has the arrangement shown in FIG. 24, the laser light emitted from the light source 632 hits the reflecting surface 34a of the rotating mirror 34. The laser light is reflected by the reflection surface 34a and goes straight toward the mirror 35. When the laser light reflected by the reflecting surface 34a hits the reflecting surface of the mirror 35, the laser light is reflected by the reflecting surface of the mirror 35, and the reflected laser light goes straight toward the phosphor 38. The scanning range on the phosphor 38 at this time is S2. Thereafter, the laser beam passes through the plano-convex lens 36 via the phosphor 38.
　反射面３４ａからミラー３５までの光路の長さをＤ１、ミラー３５の反射面から蛍光体３８までの光路の長さをＤ２とすると、反射面３４ａから蛍光体３８までの光路の長さは、Ｄ１にＤ２を加えた長さである。 Assuming that the length of the optical path from the reflecting surface 34a to the mirror 35 is D1, and the length of the optical path from the reflecting surface of the mirror 35 to the phosphor 38 is D2, the length of the optical path from the reflecting surface 34a to the phosphor 38 is This is the length obtained by adding D2 to D1.
　ここで、参考実施形態のように、光源３２が、回転ミラー３４と蛍光体３８の間に配置されていると仮定する。この場合において、光源３２からレーザ光が出射されると、レーザ光は反射面３４ａ～３４ｌのうち、最も蛍光体３８に近い反射面によって反射される。当該反射面によって反射されたレーザ光は、蛍光体３８に向かって直進する。この場合における、回転ミラー３４の反射面から蛍光体３８までの光路の長さをＤ３、蛍光体３８上における走査範囲をＳ１とする。 Here, it is assumed that the light source 32 is disposed between the rotating mirror 34 and the phosphor 38 as in the reference embodiment. In this case, when the laser light is emitted from the light source 32, the laser light is reflected by the reflection surface closest to the phosphor 38 among the reflection surfaces 34a to 34l. The laser light reflected by the reflecting surface goes straight toward the phosphor 38. In this case, the length of the optical path from the reflecting surface of the rotating mirror 34 to the phosphor 38 is D3, and the scanning range on the phosphor 38 is S1.
　回転ミラー３４の反射面３４ａ～３４ｌから蛍光体３８までの光路が長いほど、蛍光体３８上での走査範囲は広くなる。Ｄ１にＤ２を加えた長さは、Ｄ３よりも長い。このため、走査範囲Ｓ２は走査範囲Ｓ１よりも広い。 走 査 The longer the optical path from the reflecting surfaces 34a to 34l of the rotating mirror 34 to the phosphor 38, the wider the scanning range on the phosphor 38. The length obtained by adding D2 to D1 is longer than D3. Therefore, the scanning range S2 is wider than the scanning range S1.
　第三実施形態に係るランプユニット６３０において、回転ミラー３４の各反射面３４ａ～３４ｌにより反射されて蛍光体３８を介して平凸レンズ３６を透過した光は、車両前方の所定位置（例えば、車両の２５ｍ前方）の仮想鉛直スクリーン上において図２５に示すような配光パターンＰ６を形成する。具体的には、第一反射面対３４Ａ（反射面３４ａ，３４ｇ）で反射された光により、図２５に示す配光パターンＰ６のうち最下部のラインＬＡ６が形成される。また、第二反射面対３４Ｂ（反射面３４ｂ，３４ｈ）で反射された光により、ラインＬＡ６の上側にラインＬＢ６が形成される。第三反射面対３４Ｃ（反射面３４ｃ，３４ｉ）で反射された光により、ラインＬＢ６の上側にラインＬＣ６が形成される。第四反射面対３４Ｄ（反射面３４ｄ，３４ｊ）で反射された光により、ラインＬＣ６の上側にラインＬＤ６が形成される。第五反射面対３４Ｅ（反射面３４ｅ，３４ｋ）で反射された光により、ラインＬＤ６の上側にラインＬＥ６が形成される。第六反射面対３４Ｆ（反射面３４ｆ，３４ｌ）で反射された光により、ラインＬＥ６の上側にラインＬＦ６が形成される。このように、回転ミラー３４の回転によって光の反射方向が変位することで、光が複数の段に分かれてライン状に走査されて配光パターンＰ６が形成される。 In the lamp unit 630 according to the third embodiment, the light reflected by each of the reflecting surfaces 34a to 34l of the rotating mirror 34 and transmitted through the plano-convex lens 36 via the phosphor 38 is transmitted to a predetermined position in front of the vehicle (for example, the vehicle). A light distribution pattern P6 as shown in FIG. 25 is formed on the virtual vertical screen (25 m ahead). Specifically, the lowermost line LA6 of the light distribution pattern P6 shown in FIG. 25 is formed by the light reflected by the first pair of reflection surfaces 34A (reflection surfaces 34a and 34g). Further, a line LB6 is formed above the line LA6 by the light reflected by the second pair of reflection surfaces 34B (the reflection surfaces 34b and 34h). The line LC6 is formed above the line LB6 by the light reflected by the third pair of reflecting surfaces 34C (the reflecting surfaces 34c and 34i). The line LD6 is formed above the line LC6 by the light reflected by the fourth reflecting surface pair 34D (the reflecting surfaces 34d and 34j). The line LE6 is formed above the line LD6 by the light reflected by the fifth reflection surface pair 34E (the reflection surfaces 34e and 34k). The line LF6 is formed above the line LE6 by the light reflected by the sixth reflection surface pair 34F (the reflection surfaces 34f and 34l). As described above, the light reflection direction is changed by the rotation of the rotating mirror 34, so that the light is divided into a plurality of stages and scanned in a line to form the light distribution pattern P6.
　蛍光体３８上での走査範囲が広いほど、配光パターンの拡散幅は広い。つまり、回転ミラー３４の反射面３４ａ～３４ｌから蛍光体３８までの光路が長いほど、配光パターンの拡散幅は広い。このため、配光パターンＰ６の水平方向の長さＨ２は、配光パターンＰ１の水平方向の長さＨ１よりも長い。 (4) The wider the scanning range on the phosphor 38, the wider the diffusion width of the light distribution pattern. In other words, the longer the optical path from the reflecting surfaces 34a to 34l of the rotating mirror 34 to the phosphor 38, the wider the diffusion width of the light distribution pattern. Therefore, the horizontal length H2 of the light distribution pattern P6 is longer than the horizontal length H1 of the light distribution pattern P1.
（第四実施形態）
　第四実施形態に係るハイビーム用のランプユニット７３０は、図２６に示すように、光源７３２と、リフレクタとしての回転ミラー３４（第一のミラーの一例）と、回転ミラー３４の前方に配置された投影レンズとしての平凸レンズ３６と、回転ミラー３４と平凸レンズ３６との間に配置された蛍光体３８と、前後方向では回転ミラー３４と蛍光体３８との間にあって、回転ミラー３４より上方に配置されたミラー７３５（第二のミラーの一例）と、を備えている。 (Fourth embodiment)
As shown in FIG. 26, the high beam lamp unit 730 according to the fourth embodiment is disposed in front of the light source 732, the rotating mirror 34 as a reflector (an example of a first mirror), and the rotating mirror 34. A plano-convex lens 36 as a projection lens, a phosphor 38 disposed between the rotating mirror 34 and the plano-convex lens 36, and between the rotating mirror 34 and the phosphor 38 in the front-back direction and disposed above the rotating mirror 34. Mirror 735 (an example of a second mirror).
　第四実施形態に係るランプユニット７３０は、ミラー３５の代わりに、ミラー７３５をさらに備えている点、及び光源６３２に代わりに光源７３２を備えている点で、第三実施形態に係るランプユニット６３０と異なる。 The lamp unit 730 according to the third embodiment is different from the lamp unit 730 according to the third embodiment in that a lamp 730 is further provided instead of the mirror 35 and a light source 732 is provided instead of the light source 632. And different.
　光源７３２は、光源３２及び光源６３２と同じ機能を有する。光源７３２は回転ミラー３４の左前方かつ、下方寄りに配置されている。光源７３２の光出射口は、光源３２や光源６３２の光出射口よりも、やや上向きである。 The light source 732 has the same function as the light sources 32 and 632. The light source 732 is arranged on the left front of the rotating mirror 34 and toward the lower side. The light exit of the light source 732 is slightly upward from the light exits of the light source 32 and the light source 632.
　ミラー７３５は、前後方向では回転ミラー３４と蛍光体３８との間で、回転ミラー３４より上方に配置されている。ミラー７３５の表面のうち、回転ミラー３４に対向する表面は反射面である。ミラー７３５は、回転ミラー３４によって反射されたレーザ光が当たる位置に配置されている。 The mirror 735 is disposed above the rotating mirror 34 between the rotating mirror 34 and the phosphor 38 in the front-rear direction. Of the surfaces of the mirror 735, the surface facing the rotating mirror 34 is a reflection surface. The mirror 735 is arranged at a position where the laser light reflected by the rotating mirror 34 shines.
　図２７は、第四実施形態に係るランプユニット７３０の側面図である。回転ミラー３４が、図２７に示すような配置関係にあるとき、光源７３２から出射されたレーザ光は、回転ミラー３４の反射面３４ａに当たる。当該レーザ光は、反射面３４ａによって反射され、ミラー７３５に向かって直進する。反射面３４ａによって反射されたレーザ光が、ミラー７３５の反射面に当たると、当該レーザ光はミラー７３５の反射面によって反射され、反射されたレーザ光は、蛍光体３８に向かって直進する。このときの走査範囲はＳ３である。当該レーザ光は、その後、蛍光体３８を介して平凸レンズ３６を透過する。 FIG. 27 is a side view of a lamp unit 730 according to the fourth embodiment. When the rotating mirror 34 has the arrangement shown in FIG. 27, the laser light emitted from the light source 732 impinges on the reflecting surface 34a of the rotating mirror 34. The laser light is reflected by the reflection surface 34a and travels straight to the mirror 735. When the laser light reflected by the reflection surface 34a hits the reflection surface of the mirror 735, the laser light is reflected by the reflection surface of the mirror 735, and the reflected laser light goes straight toward the phosphor 38. The scanning range at this time is S3. Thereafter, the laser beam passes through the plano-convex lens 36 via the phosphor 38.
　反射面３４ａからミラー７３５までの光路の長さをＤ４、ミラー７３５から蛍光体３８までの光路の長さをＤ５とすると、反射面３４ａから蛍光体３８までの光路の長さは、Ｄ４にＤ５を加えた長さである。 Assuming that the length of the optical path from the reflecting surface 34a to the mirror 735 is D4 and the length of the optical path from the mirror 735 to the phosphor 38 is D5, the length of the optical path from the reflecting surface 34a to the phosphor 38 is D5. Length.
　ここで、参考実施形態のように、光源３２が、回転ミラー３４と蛍光体３８の間に配置されていると仮定する（図２７では光源３２を破線で示している）。この場合において、レーザ光は反射面３４ａ～３４ｌのうち、最も蛍光体３８に近い反射面によって反射される。当該反射面によって反射されたレーザ光は、蛍光体３８に向かって直進する。この場合における、回転ミラー３４の反射面から蛍光体３８までの光路の長さはＤ３である。また、この場合における、蛍光体３８上における走査範囲をＳ１とする。 Here, it is assumed that the light source 32 is disposed between the rotating mirror 34 and the phosphor 38 as in the reference embodiment (the light source 32 is indicated by a broken line in FIG. 27). In this case, the laser light is reflected by the reflection surface closest to the phosphor 38 among the reflection surfaces 34a to 34l. The laser light reflected by the reflecting surface goes straight toward the phosphor 38. In this case, the length of the optical path from the reflecting surface of the rotating mirror 34 to the phosphor 38 is D3. In this case, the scanning range on the phosphor 38 is S1.
　Ｄ４にＤ５を加えた長さは、Ｄ３よりも長い。このため、走査範囲Ｓ３は走査範囲Ｓ１よりも広い。 長 The length obtained by adding D5 to D4 is longer than D3. Therefore, the scanning range S3 is wider than the scanning range S1.
　第四実施形態に係るランプユニット７３０において、回転ミラー３４の各反射面３４ａ～３４ｌにより反射されて蛍光体３８を介して平凸レンズ３６を透過した光は、車両前方の所定位置（例えば、車両の２５ｍ前方）の仮想鉛直スクリーン上において図２８に示すような配光パターンＰ７を形成する。具体的には、第一反射面対３４Ａ（反射面３４ａ，３４ｇ）で反射された光により、図２８に示す配光パターンＰ７のうち最下部のラインＬＡ７が形成される。また、第二反射面対３４Ｂ（反射面３４ｂ，３４ｈ）で反射された光により、ラインＬＡ７の上側にラインＬＢ７が形成される。第三反射面対３４Ｃ（反射面３４ｃ，３４ｉ）で反射された光により、ラインＬＢ７の上側にラインＬＣ７が形成される。第四反射面対３４Ｄ（反射面３４ｄ，３４ｊ）で反射された光により、ラインＬＣ７の上側にラインＬＤ７が形成される。第五反射面対３４Ｅ（反射面３４ｅ，３４ｋ）で反射された光により、ラインＬＤ７の上側にラインＬＥ７が形成される。第六反射面対３４Ｆ（反射面３４ｆ，３４ｌ）で反射された光により、ラインＬＥ７の上側にラインＬＦ７が形成される。このように、回転ミラー３４の回転によって光の反射方向が変位することで、光が複数の段に分かれてライン状に走査されて配光パターンＰ７が形成される。 In the lamp unit 730 according to the fourth embodiment, the light reflected by each of the reflecting surfaces 34a to 34l of the rotating mirror 34 and transmitted through the phosphor 38 through the plano-convex lens 36 is at a predetermined position in front of the vehicle (for example, in the vehicle). A light distribution pattern P7 as shown in FIG. 28 is formed on the virtual vertical screen (25 m ahead). Specifically, the light reflected by the first pair of reflection surfaces 34A (reflection surfaces 34a and 34g) forms the lowermost line LA7 of the light distribution pattern P7 shown in FIG. Further, a line LB7 is formed above the line LA7 by the light reflected by the second pair of reflection surfaces 34B (the reflection surfaces 34b and 34h). A line LC7 is formed above the line LB7 by the light reflected by the third pair of reflection surfaces 34C (the reflection surfaces 34c and 34i). The line LD7 is formed above the line LC7 by the light reflected by the fourth reflection surface pair 34D (reflection surfaces 34d and 34j). The line LE7 is formed above the line LD7 by the light reflected by the fifth reflection surface pair 34E (the reflection surfaces 34e and 34k). A line LF7 is formed above the line LE7 by the light reflected by the sixth reflecting surface pair 34F (the reflecting surfaces 34f and 34l). As described above, when the reflection direction of the light is changed by the rotation of the rotating mirror 34, the light is divided into a plurality of stages and scanned in a line, thereby forming the light distribution pattern P7.
　蛍光体３８上での走査範囲が広いほど、配光パターンの拡散幅は広い。つまり、回転ミラー３４の反射面３４ａ～３４ｌから蛍光体３８までの光路が長いほど、配光パターンの拡散幅は広い。このため、配光パターンＰ７の水平方向の長さＨ３は、配光パターンＰ１の水平方向の長さＨ１よりも長い。 (4) The wider the scanning range on the phosphor 38, the wider the diffusion width of the light distribution pattern. In other words, the longer the optical path from the reflecting surfaces 34a to 34l of the rotating mirror 34 to the phosphor 38, the wider the diffusion width of the light distribution pattern. Therefore, the horizontal length H3 of the light distribution pattern P7 is longer than the horizontal length H1 of the light distribution pattern P1.
　上記構成に係る光照射装置によれば、回転ミラー３４（第一のミラーの一例）で反射された光は、ミラー３５（第二のミラーの一例）によってさらに反射される。このため、光が回転ミラー３４の反射面３４ａ～３４ｌでのみ反射される場合と比べて、反射面３４ａ～３４ｌから蛍光体３８までの光路を長くすることができる。それにより、光学ユニットを小型化することができる。 According to the light irradiation device having the above configuration, the light reflected by the rotating mirror 34 (an example of the first mirror) is further reflected by the mirror 35 (an example of the second mirror). Therefore, the optical path from the reflecting surfaces 34a to 34l to the phosphor 38 can be made longer than when the light is reflected only by the reflecting surfaces 34a to 34l of the rotating mirror 34. Thus, the size of the optical unit can be reduced.
　なお、ランプユニット６３０，７３０が、蛍光体３８を含んでいない場合においても、第三実施形態及び第四実施形態に係る光学ユニットによれば、レーザ光は回転ミラー３４とミラー３５，７３５それぞれによって反射されるので、レーザ光が回転ミラー３４でしか反射されない場合と比べて、回転ミラー３４の反射面３４ａ～３４ｌから当該光学ユニットの光出射面（投影レンズ３６又はクリアカバー）までの光路が長くなる。このため、配光パターンの拡散幅が狭まってしまうことを防ぎつつ、光学ユニットを小型化させることができる。 Note that, even when the lamp units 630 and 730 do not include the phosphor 38, according to the optical units according to the third and fourth embodiments, the laser light is emitted by the rotating mirror 34 and the mirrors 35 and 735, respectively. Since the laser light is reflected, the optical path from the reflecting surfaces 34a to 34l of the rotating mirror 34 to the light emitting surface (projection lens 36 or clear cover) of the optical unit is longer than when the laser light is reflected only by the rotating mirror 34. Become. Therefore, the optical unit can be reduced in size while preventing the diffusion width of the light distribution pattern from being reduced.
（第五実施形態）
　図２９は、第五実施形態に係るランプユニット８３０を示す。
　図２９に示すように、上記第三実施形態及び第四実施形態で用いたポリゴンミラー３４の代わりに、ブレードスキャン方式の回転ミラー５００を用いてもよい。 (Fifth embodiment)
FIG. 29 shows a lamp unit 830 according to the fifth embodiment.
As shown in FIG. 29, a rotating mirror 500 of a blade scan system may be used instead of the polygon mirror 34 used in the third and fourth embodiments.
　回転ミラー５００が、図２９に示すような配置関係にあるとき、光源６３２から出射されたレーザ光は、回転ミラー５００のブレード５０１ａに当たる。当該レーザ光は、ブレード５０１ａによって反射され、ミラー３５に向かって直進する。ブレード５０１ａによって反射されたレーザ光が、ミラー３５の反射面に当たると、当該レーザ光はミラー３５の反射面によって反射され、反射されたレーザ光は、蛍光体３８に向かって直進する。このため、第五実施形態においても、ブレード５０１ａから蛍光体３８までの光路を長くすることができる。それにより、光学ユニットを小型化することができる。 と き When the rotating mirror 500 has the arrangement shown in FIG. 29, the laser light emitted from the light source 632 hits the blade 501a of the rotating mirror 500. The laser light is reflected by the blade 501a and travels straight toward the mirror 35. When the laser light reflected by the blade 501a hits the reflection surface of the mirror 35, the laser light is reflected by the reflection surface of the mirror 35, and the reflected laser light goes straight toward the phosphor 38. Therefore, also in the fifth embodiment, the optical path from the blade 501a to the phosphor 38 can be lengthened. Thus, the size of the optical unit can be reduced.
　上記の実施形態においては、回転ミラー３４に係る反射面３４ａ～３４ｌ同士の境界面は不連続であるが、この例に限られない。例えば、反射面３４ａ～３４ｌ同士の境界面は連続面であってもよい。 In the above embodiment, the boundary surface between the reflecting surfaces 34a to 34l of the rotating mirror 34 is discontinuous, but is not limited to this example. For example, the boundary surface between the reflection surfaces 34a to 34l may be a continuous surface.
　上記の各実施形態においては、上面視において１２面体の回転ミラー３４を用い、対角線上に配置された一対の反射面により反射された光が配光パターンのうち同一のラインを形成しているが、この例に限られない。例えば、１つの反射面により反射された光により１つのラインを形成するようにしてもよい。この場合は、例えば、配光パターンが６つのラインから構成されるとすると、回転ミラーは、上面視において６面体として形成され、回転方向に沿って６つの反射面を備えることとなる。 In each of the above embodiments, although the dodecahedral rotating mirror 34 is used when viewed from above, the light reflected by the pair of reflecting surfaces arranged diagonally forms the same line in the light distribution pattern. However, the present invention is not limited to this example. For example, one line may be formed by light reflected by one reflection surface. In this case, for example, assuming that the light distribution pattern is composed of six lines, the rotating mirror is formed as a hexahedron in a top view, and has six reflecting surfaces along the rotating direction.
　上記の実施形態においては、ランプユニットが車両用前照灯に搭載されたものとして説明しているが、この例に限られない。上記で説明したような光源や回転ミラー等を備えた光学ユニットを、車両に搭載されるセンサユニット（例えば、レーザレーダやＬｉＤＡＲ、可視光線カメラ、赤外線カメラ等）の構成部品に適用することもできる。 In the above embodiment, the lamp unit is described as being mounted on the vehicle headlamp, but is not limited to this example. The optical unit including the light source and the rotating mirror as described above can be applied to components of a sensor unit (for example, a laser radar, a LiDAR, a visible light camera, an infrared camera, etc.) mounted on a vehicle. .
　以上、本発明を上述の各実施の形態を参照して説明したが、本発明は上述の各実施の形態に限定されるものではなく、各実施の形態の構成を適宜組み合わせたものや置換したものについても本発明に含まれるものである。また、当業者の知識に基づいて各実施の形態における組合せや処理の順番を適宜組み替えることや各種の設計変更等の変形を各実施の形態に対して加えることも可能であり、そのような変形が加えられた実施の形態も本発明の範囲に含まれうる。 As described above, the present invention has been described with reference to the above embodiments. However, the present invention is not limited to the above embodiments, and the configurations of the embodiments are appropriately combined or replaced. These are also included in the present invention. Further, it is also possible to appropriately change the combination and the order of processing in each embodiment based on the knowledge of those skilled in the art, and to add various modifications such as design changes to each embodiment. An embodiment to which is added can also be included in the scope of the present invention.
　本出願は、２０１８年９月２５日出願の日本特許出願２０１８－１７９１１４号、２０１８年９月２５日出願の日本特許出願２０１８－１７９１１５号および２０１８年９月２５日出願の日本特許出願２０１８－１７９１１６号に基づくものであり、その内容はここに参照として取り込まれる。 This application discloses Japanese Patent Application No. 2018-179114 filed on September 25, 2018, Japanese Patent Application No. 2018-179115 filed on September 25, 2018, and Japanese Patent Application No. 2018-179116 filed on September 25, 2018. No., the content of which is incorporated herein by reference.

Claims (11)

  1. 　光源と、
    　前記光源から出射された光を反射させる回転可能なミラーと、
    を備え、
    　前記ミラーの回転によって前記光の反射方向が変位することで、前記光が複数の段に分かれてライン状に走査されて配光パターンを形成する、光照射装置であって、
    　前記ミラーは少なくとも一つの反射面から構成され、当該少なくとも一つの反射面において前記ミラーの回転方向における曲率が変化するように構成されている、光照射装置。     Light source,
    A rotatable mirror that reflects light emitted from the light source,
    With
    A light irradiating device, wherein the light is divided into a plurality of stages and scanned in a line to form a light distribution pattern by displacing the reflection direction of the light by rotation of the mirror,
    The light irradiation device, wherein the mirror includes at least one reflection surface, and the curvature in the rotation direction of the mirror changes on the at least one reflection surface.
  2. 　前記光の走査方向における前記ラインの中央領域を形成するための前記光の走査速度が、前記中央領域以外の領域を形成するための前記光の走査速度よりも遅くなるように、前記曲率が設定されている、請求項１に記載の光照射装置。 The curvature is set such that the scanning speed of the light for forming the central region of the line in the scanning direction of the light is lower than the scanning speed of the light for forming the region other than the central region. The light irradiation device according to claim 1, wherein
  3. 　前記少なくとも一つの反射面は、前記回転方向において平面と凸状または凹状の湾曲面とから構成されている、請求項１または２に記載の光照射装置。 3. The light irradiation device according to claim 1, wherein the at least one reflection surface includes a flat surface and a convex or concave curved surface in the rotation direction. 4.
  4. 　光源と、
    　前記光源から出射された光を反射させる回転可能なミラーと、
    を備え、
    　前記ミラーの回転によって前記光の反射方向が変位することで、前記光が複数の段に分かれてライン状に走査されて配光パターンを形成する、光照射装置であって、
    　前記ミラーは、前記ミラーの回転方向に沿って配置された複数の反射面を有し、
    　前記複数の反射面は、前記配光パターンの少なくとも一部を構成する同一のライン上で前記光の少なくとも一部が重複するように構成されている、光照射装置。     Light source,
    A rotatable mirror that reflects light emitted from the light source,
    With
    A light irradiating device, wherein the light is divided into a plurality of stages and scanned in a line to form a light distribution pattern by displacing the reflection direction of the light by rotation of the mirror,
    The mirror has a plurality of reflection surfaces arranged along a rotation direction of the mirror,
    The light irradiation device, wherein the plurality of reflection surfaces are configured such that at least a part of the light overlaps on a same line that forms at least a part of the light distribution pattern.
  5. 　前記複数の反射面のうち少なくとも二つの反射面で反射された前記光が前記配光パターンの少なくとも一部を構成する同一のラインを形成する、請求項４に記載の光照射装置。 The light irradiation device according to claim 4, wherein the light reflected by at least two of the plurality of reflection surfaces forms the same line that forms at least a part of the light distribution pattern.
  6. 　前記配光パターンは、複数の第一のラインと、前記複数の第一のラインの間に配置された第二のラインとを含み、
    　前記少なくとも二つの反射面で反射された前記光が前記第二のラインを形成するように構成されている、請求項５に記載の光照射装置。     The light distribution pattern includes a plurality of first lines, and a second line disposed between the plurality of first lines,
    The light irradiation device according to claim 5, wherein the light reflected by the at least two reflecting surfaces is configured to form the second line.
  7. 　前記ミラーは、ポリゴンミラーとして構成されている、請求項４から６のいずれか一項に記載の光照射装置。 The light irradiation device according to any one of claims 4 to 6, wherein the mirror is configured as a polygon mirror.
  8. 　光源と、
    　前記光源から出射された光を反射させる回転可能な第一のミラーと、
    を備え、
    　前記第一のミラーの回転によって前記光の反射方向が変位することで、前記光が複数の段に分かれてライン状に走査される、光照射装置であって、
    　前記第一のミラーにより反射された光を反射させる第二のミラーをさらに備えている、光照射装置。     Light source,
    A rotatable first mirror that reflects light emitted from the light source,
    With
    A light irradiation device, wherein the light is divided into a plurality of stages and scanned in a line by the displacement of the reflection direction of the light by rotation of the first mirror,
    The light irradiation device, further comprising a second mirror that reflects light reflected by the first mirror.
  9. 　前記第二のミラーにより反射された光を透過する光学部材をさらに備えている、請求項８に記載の光照射装置。 The light irradiation device according to claim 8, further comprising: an optical member that transmits light reflected by the second mirror.
  10. 　前記光学部材は、蛍光体と投影レンズとを含み、
    　前記蛍光体は、前記第一のミラーと前記投影レンズとの間に配置され、
    　前記第二のミラーにより反射された光は、前記蛍光体上に走査され、
    　前記蛍光体から出射された光は、前記投影レンズを透過して出射される、請求項９に記載の光照射装置。     The optical member includes a phosphor and a projection lens,
    The phosphor is disposed between the first mirror and the projection lens,
    The light reflected by the second mirror is scanned on the phosphor,
    The light irradiation device according to claim 9, wherein the light emitted from the phosphor is transmitted through the projection lens and emitted.
  11. 　前記第一のミラーはポリゴンミラーである、請求項８から１０のいずれか一項に記載の光照射装置。 The light irradiation device according to any one of claims 8 to 10, wherein the first mirror is a polygon mirror.
PCT/JP2019/033218 2018-09-25 2019-08-26 Light shining device WO2020066406A1 (en)

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JP6951076B2 (en) * 2016-10-14 2021-10-20 株式会社小糸製作所 Optical unit
JP6935185B2 (en) * 2016-10-20 2021-09-15 株式会社小糸製作所 Vehicle headlights
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